Air quality - Determination of odour concentration by dynamic olfactometry

This European Standard (EN) defines a method for the objective determination of the odour concentration of a gaseous sample using dynamic olfactometry with  human assessors and the emission rate of odours emanating from point sources, area sources with outward flow and area sources without outward flow. The primary application is to provide a common basis for evaluation of odorant emissions in the member states of the European Union.

Luftbeschaffenheit - Bestimmung der Geruchsstoffkonzentration mit dynamischer Olfaktometrie

Diese Europäische Norm legt ein Verfahren fest zur objektiven Bestimmung der Geruchsstoffkonzentration einer gasförmigen Probe durch Anwendung der dynamischen Olfaktometrie mit Personen als Prüfern und zur Bestimmung der Emissionsströme von Geruchsstoffen aus Punktquellen, Flächenquellen mit definiertem Volumenstrom und Flächenquellen ohne definierten Volumenstrom. Das Hauptziel ist die Schaffung einer gemeinsamen Grundlage zur Bewertung von Geruchsstoffemissionen in den Mitgliedstaaten der Europäischen Union.
Der Geltungsbereich dieser Norm bezieht sich auf die Messung von Geruchsstoffkonzentrationen reiner Substanzen, definierter Gemische und nicht definierter Gemische gasförmiger Geruchsstoffe in Luft oder Stickstoff mit dynamischer Olfaktometrie, wobei ein Panel mit Personen als Prüfern die Funktion von Sensoren übernimmt. Die Messeinheit ist die Europäische Geruchseinheit pro Kubikmeter [GEE/m³]. Die Geruchsstoffkonzentration wird durch Bestimmung des Verdünnungsfaktors gemessen, der zum Erreichen der Wahrnehmungsschwelle erforderlich ist. Die Geruchsstoffkonzentration an der Wahrnehmungsschwelle beträgt per Definition 1 GEE/m³. Die Geruchsstoffkonzentration wird dann als Vielfaches der Wahrnehmungsschwelle ausgedrückt. Der Messbereich liegt üblicherweise zwischen 101 und 107 GEE/m³ (einschließlich Vorverdünnung).
Diese Europäische Norm gilt für:
-   Messen der Massenkonzentration reiner Geruchsstoffe an der Wahrnehmungsschwelle in g/m³;
-   Messen der Geruchsstoffkonzentration von Geruchsstoffgemischen in GEE/m³;
-   Messen der Emissionsrate von Geruchsstoffemissionen aus Punktquellen und Flächenquellen (mit und ohne definierten Volumenstrom), einschließlich Vorverdünnung während der Probenahme;
-   Probenahme von Geruchsstoffen aus Emissionen mit hoher Feuchte und Temperatur (bis 200 °C);
-   Feststellen der Wirksamkeit von Abgasreinigungseinrichtungen, die zur Reduzierung der Geruchsstoffemissionen verwendet werden.
Die Beschreibung der Geruchsstoffemission er

Qualité de l'air - Détermination de la concentration d'une odeur par olfactométrie dynamique

La présente Norme européenne définit une méthode pour déterminer de façon objective la concentration d'odeur d'un échantillon gazeux par olfactométrie dynamique avec des sujets humains ainsi que le taux d'émission d'odeurs émanant de sources ponctuelles, de sources superficielles avec écoulement vers l'extérieur et de sources superficielles sans écoulement vers l'extérieur. La première application est de fournir une base commune pour l'évaluation des émissions odorantes dans les États membres de l'Union Européenne.
Le domaine d'application de la présente Norme européenne est la mesure de la concentration d'odeur de substances pures, de mélanges définis et de mélanges non définis d'odorants gazeux dans l'air ou l'azote, en utilisant l'olfactométrie dynamique avec un jury de sujets humains comme détecteurs. L'unité de mesure est l'unité d'odeur européenne par mètre cube ouE/m3. La concentration d'odeur se mesure en déterminant le facteur de dilution requis pour atteindre le seuil de détection. La concentration d'odeur au seuil de détection est par définition de 1 ouE/m3. La concentration d'odeur s'exprime ensuite en termes de multiples du seuil de détection. L'étendue de mesure va en général de 101 ouE/m3 à 107 ouE/m3 (y compris la prédilution).
Le domaine d'application de la présente Norme européenne comprend :
¾ la mesure de la concentration massique au seuil de détection des substances odorantes pures, en grammes par mètre cube ;
¾ la mesure de la concentration de l'odeur des mélanges de substances odorantes, en ouE/m3 ;
¾ la mesure du taux d'émission des émissions odorantes depuis des sources ponctuelles et des sources superficielles (avec ou sans écoulement extérieur), y compris la prédilution pendant le prélèvement ;
¾ le prélèvement de substances odorantes à partir d'émissions avec une humidité et une température élevées (jusqu'à 200 °C) ;
¾ la détermination de l'efficacité des dispositifs de rejet utilisés pour réduire les émissions d'odeurs.

Kakovost zraka – Ugotavljanje koncentracije vonja z dinamično olfaktometrijo

General Information

Status
Published
Publication Date
15-Apr-2003
Technical Committee
Drafting Committee
Current Stage
9093 - Decision to confirm - Review Enquiry
Due Date
24-Nov-2007
Completion Date
24-Nov-2007

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.DNWRPHWULMRLuftbeschaffenheit - Bestimmung der Geruchsstoffkonzentration mit dynamischer OlfaktometrieQualité de l'air - Détermination de la concentration d'une odeur par olfactométrie dynamiqueAir quality - Determination of odour concentration by dynamic olfactometry13.040.01Kakovost zraka na splošnoAir quality in generalICS:Ta slovenski standard je istoveten z:EN 13725:2003SIST EN 13725:2003en01-november-2003SIST EN 13725:2003SLOVENSKI

STANDARD
SIST EN 13725:2003

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13725April 2003ICS 13.040.99English versionAir quality - Determination of odour concentration by dynamicolfactometryQualité de l'air - Détermination de la concentration d'uneodeur par olfactométrie dynamiqueLuftbeschaffenheit - Bestimmung derGeruchsstoffkonzentration mit dynamischer OlfaktometrieThis European Standard was approved by CEN on 6 December 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13725:2003 ESIST EN 13725:2003

EN 13725:2003 (E)2ContentspageForeword......................................................................................................................................................................3Introduction.................................................................................................................................................................41Scope..............................................................................................................................................................42Normative references....................................................................................................................................53Terms, definitions and symbols...................................................................................................................54Principle of measurement...........................................................................................................................195Performance quality requirements.............................................................................................................196Materials, gases and panel members........................................................................................................277Sampling.......................................................................................................................................................358Presentation of odorants to assessors.....................................................................................................389Data recording, calculation and reporting................................................................................................40Annex A (normative)

Working conditions and working platform for sampling.................................................46Annex B (informative)

Physiological principles....................................................................................................47Annex C (informative)

Example of calculation of instrumental accuracy and instability.................................51Annex D (informative)

Example of calculation of odour measurements within one laboratory......................53Annex E (informative)

Example of calculations for panel selection...................................................................55Annex F (informative)

Example of the calculation of the odour concentration from a set of panelmember responses......................................................................................................................................56Annex G (informative)

Example of the calculation used to determine the number of odourconcentration measurements required to achieve a defined precision................................................60Annex H (informative)

Example of the calculation used to determine the number of odourconcentration measurements required to detect a difference between two means.............................62Annex I (informative)

Example of the calculation of the odour flow rate (standard conditions) for a wetemission........................................................................................................................................................65Annex J (informative)

Sampling strategy...............................................................................................................66Bibliography..............................................................................................................................................................70SIST EN 13725:2003

EN 13725:2003 (E)3ForewordThis document (EN 13725:2003) has been prepared by Technical Committee CEN/TC 264 "Air quality", thesecretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by October 2003, and conflicting national standards shall be withdrawn at the latestby October 2003.Annex A is normative. Annexes B, C, D, E, F, G, H, I and J are informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 13725:2003

EN 13725:2003 (E)4IntroductionThis European Standard and its quality criteria were validated in an Interlaboratory Comparison for Olfactometry(ICO) in 1996, that was funded by the participating laboratories.Sampling aspects are included in the structure of this Standard, although further research is necessary to completethis issue. Due to lack of financial support, no progress has been made on this point. Improvements in samplingmay be the subject of a future revision of this European Standard.1 ScopeThis European Standard specifies a method for the objective determination of the odour concentration of agaseous sample using dynamic olfactometry with human assessors and the emission rate of odours emanatingfrom point sources, area sources with outward flow and area sources without outward flow. The primary applicationis to provide a common basis for evaluation of odour emissions in the member states of the European Union.This European Standard is applicable to the measurement of odour concentration of pure substances, definedmixtures and undefined mixtures of gaseous odorants in air or nitrogen, using dynamic olfactometry with a panel ofhuman assessors being the sensor. The unit of measurement is the European odour unit per cubic metre: ouE/m3.The odour concentration is measured by determining the dilution factor required to reach the detection threshold.The odour concentration at the detection threshold is by definition 1 ouE/m3. The odour concentration is thenexpressed in terms of multiples of the detection threshold. The range of measurement is typically from 101 ouE/m3to 107 ouE/m3 (including pre-dilution).The field of application of this European Standard includes:¾ the measurement of the mass concentration at the detection threshold of pure odorous substances in g/m3;¾ the measurement of the odour concentration of mixtures of odorants in ouE/m3;¾ the measurement of the emission rate of odorous emissions from point sources and surface sources (with andwithout an outward flow), including pre-dilution during sampling;¾ the sampling of odorants from emissions of high humidity and temperature (up to 200 °C);¾ the determination of effectiveness of end-of-pipe devices used to reduce odour emissions.The characterisation of odour emissions requires detailed measurement of the gas velocity, that shall be performedaccording to the relevant standards included in the normative references.This European Standard is not applicable to:¾ the measurement of odours potentially released by particles of odorous solids or droplets of odorous fluidssuspended in emissions;¾ the measuring strategy to be applied in case of variable emission rates;¾ the measurement of the relationship between odour stimulus and assessor response above detectionthreshold;¾ direct measurement of hedonic tone (or (un)pleasantness) or direct assessment of potential annoyance;¾ field panel methods;¾ measurement of recognition thresholds;SIST EN 13725:2003

EN 13725:2003 (E)5¾ measurement of identification thresholds.Although the ultimate application of odour measurement is in reducing odour nuisance, the relation betweenmeasured thresholds of odour according to this standard and the occurrence of odour nuisance is highly complex.It is profoundly influenced by the atmospheric processes determining the dispersion of odours, the quality of theodour (hedonic tone) and finally by the receptor characteristics of those exposed to the odour. Thesecharacteristics not only vary strongly between individuals, but also in time within one individual. The relationbetween emissions, dispersion, exposure and annoyance is not within the scope of this European Standard.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).ISO 10780, Stationary source emissions - Measurement of velocity and volume flowrate of gas streams inducts.3 Terms, definitions and symbols3.1 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1.1accepted reference valuevalue that serves as an agreed upon reference for comparison, and which is derived as a consensus or certifiedvalue, based on collaborative experimental work under the auspices of a scientific or engineering group (derivedfrom ISO 5725-1)3.1.2accuracycloseness of agreement between test result and the accepted reference value[ISO 5725-1]NOTEThe term ‘accuracy’, when applied to a set of test results, involves a combination of random components and acommon systematic error or bias component.3.1.3(sensory) adaptationtemporary modification of the sensitivity of a sense organ due to continued and/or repeated stimulation[ISO 5492]3.1.4anosmialack of sensitivity to olfactory stimuli[ISO 5492]3.1.5assessorsomebody who participates in odour testingSIST EN 13725:2003

EN 13725:2003 (E)63.1.6biasdifference between the expectation of the test results and an accepted reference value[ISO 5725-1]NOTEBias is often called 'systematic error'.3.1.7certified reference material, CRMreference material of which one or more property values are certified by a technically valid procedure accompaniedby or traceable to a certificate or other documentation which is issued by a certifying body[ISO 5725-4]3.1.8decision limitoutput signal value above which it can be affirmed, with a probability of 1 - a of at least 95 %, that the measuredsample is different from a zero sampleNOTEA zero sample has 5 % probability of causing an output signal above the decision limit (derived fromISO 6879).3.1.9delayed olfactometrymeasurement of an odour with a time-lag between sampling and measurement. The odour sample is preserved inan appropriate container3.1.10detection threshold (for a reference material)odorant concentration which has a probability of 0,5 of being detected under the conditions of the test3.1.11detection threshold (for an environmental sample)dilution factor at which the sample has a probability of 0,5 of being detected under the conditions of the test3.1.12diffuse sourcessources with defined dimensions (mostly surface sources) which do not have a defined waste air flow, such aswaste dumps, lagoons, fields after manure spreading, un-aerated compost piles3.1.13dilution factordilution factor is the ratio between flow or volume after dilution and the flow or volume of the odorous gas3.1.14dilution seriespresentation of a sequence of dilutions to one panel member in order to obtain one Individual Threshold Estimate(see Figure 1)NOTEOne dilution series can consist of:One series of presentations, at odour concentrations in ascending or random order, where, when sorted in order of descendingconcentrations, a significant change from consistently TRUE responses to a FALSE response occurs (see also Figure 1).3.1.15direct olfactometrymeasurement of odour concentrations without any time-lag between the sampling (operation) and themeasurements; equivalent to dynamic sampling or on-line olfactometrySIST EN 13725:2003

EN 13725:2003 (E)73.1.16dynamic olfactometerdynamic olfactometer delivers a flow of mixtures of odorous and neutral gas with known dilution factors in acommon outlet3.1.17dynamic olfactometryolfactometry using a dynamic olfactometer3.1.18dynamic dilutiondilution achieved by mixing two known flows of gas, odorous sample and neutral gas, respectively. The rate ofdilution is calculated from the flow rates3.1.19European Odour unitthat amount of odorant(s) that, when evaporated into 1 cubic metre of neutral gas at standard conditions, elicits aphysiological response from a panel (detection threshold) equivalent to that elicited by one European ReferenceOdour Mass (EROM), evaporated in one cubic metre of neutral gas at standard conditions3.1.20European Reference Odour Mass , EROMaccepted reference value for the European odour unit, equal to a defined mass of a certified reference material.One EROM is equivalent to 123 mg n-butanol (CAS-Nr. 71-36-3). Evaporated in 1 cubic metre of neutral gas thisproduces a concentration of 0,040 mmol/mol3.1.21expanded uncertaintyquantity defining an interval about the result of a measurement that may be expected to encompass a large fractionof the distribution of values that could reasonably be attributed to the measurand[ENV 13005]3.1.22expected valuevalue approached by the average value with an increasing number of measurement values3.1.23forced choice methodfor this standard the following definition applies: An olfactometric method in which assessors are forced to make achoice out of two or more air flows, one of which is the diluted sample, even if no difference is observed3.1.24fugitive sourceselusive or difficult to identify sources releasing undefined quantities of odorants e.g. valve and flange leakage,passive ventilation apertures etc.3.1.25geometric meanantilog of the arithmetic average of the logarithms of a set of values or nnyyy×××....21NOTEThe formula contains an n-root (not to be confused with a square root).3.1.26group thresholddetection threshold applying to a group of assessorsSIST EN 13725:2003

EN 13725:2003 (E)83.1.27identification thresholdsee recognition threshold3.1.28individual thresholddetection threshold applying to an individual3.1.29individual threshold estimate, ITEdetection threshold applying to an individual estimated on the basis of one dilution series3.1.30instabilitychange of a characteristic over a stated period of time, consisting of a systematic part (drift) and a random part(dispersion)[ISO 9169]3.1.31instrumental dilution rangerange between the minimum and maximum dilution factor3.1.32instrumental lag timetime taken for the output signal to reach 10 % (by convention) of the final change in reading (derived fromISO 6879)3.1.33instrumental response timetime taken for an instrument to respond to an abrupt change in value of the air quality characteristic. It is the sum ofthe lag time and rise time (rising mode) or lag time and fall time (falling mode) (derived from ISO 6879)3.1.34instrumental rise time (fall time)time taken for the reading to pass from (by convention) 10 % to (by convention) 90 % of the final change in outputsignal reading (derived from ISO 6879). For instruments where transient oscillations occur in the approach to thefinal output signal reading, the rise time is the time taken for the instrument reading to pass from (by convention)10 % of the final change in instrument reading until the oscillations fall to less than (by convention) 10 % of the finalchange in instrument reading3.1.35maximum dilution factormaximum settable dilution factor of the olfactometer; an instrument property3.1.36measurementthe presentation to all panel members of those dilution series necessary to produce sufficient data to calculate theodour concentration for one sample (see Figure 1)3.1.37measuring rangemeasuring range comprises all odour concentrations which can be measured by a specific olfactometer. It dependson the minimum and maximum dilution factor and the step factor. The numerical values defining the measuringrange are the minimum dilution factor multiplied with the step factor to the power 1,5 and the maximum dilutionfactor divided by the step factor to the power 1,53.1.38minimum dilution factorminimum settable dilution factor of the olfactometer; an instrument propertySIST EN 13725:2003

EN 13725:2003 (E)93.1.39neutral gasair or nitrogen that is treated in such a way that it is as odourless as technically possible and that does, accordingto panel members, not interfere with the odour under investigationSAFETY WARNINGNitrogen is only used to predilute the sample itself. For the olfactometer the neutral gas used to dilutethe sample and present a reference shall be air.3.1.40objective methodany method in which the effects of personal opinions are minimised[ISO 5492]3.1.41odorantsubstance which stimulates a human olfactory system so that an odour is perceived (Hangartner, M, 1989, seeBibliography)3.1.42odour flow rateodour flow rate is the quantity of European odour units

which crosses a given surface divided by time. It is theproduct of the odour concentration cod, the outlet velocity v and the outlet area A or the product of the odourconcentration cod and the pertinent volume flow rate V . Its unit is ouE/h (or ouE/min or ouE/s, respectively)NOTEThe odour (emission) flow rate, expressed in units ouE/s, is the quantity equivalent to the emission mass flow rate,expressed in kg/s, as used in dispersion models for example.3.1.43odorous gasgas that contains odorants3.1.44odourorganoleptic attribute perceptible by the olfactory organ on sniffing certain volatile substances[ISO 5492]3.1.45odour abatement efficiencyreduction of the odour concentration or the odour flow rate due to an abatement technique, expressed as a fraction(or percentage) of the odour concentration in or the odour flow rate of the untreated gas stream3.1.46odour concentrationnumber of European odour units in a cubic metre of gas at standard conditionsNOTEThe odour concentration is not a linear measure for the intensity of an odour. Steven’s Law describes the a-linearrelation between odour stimulus and its perceived intensity. When using odour concentrations in dispersion modelling, the issueis complicated by the effects of the averaging time of the dispersion model, further complicating the use of the odourconcentration as a direct measure for dose. To define a ‘no nuisance level’, the entire method of dosage evaluation, includingthe dispersion model, will yield a ‘dose’. The relation between this ‘dose’ and its effect (odour annoyance) should be validated inpractical situations to be a useful predictive tool for occurrence of odour nuisance.3.1.47odour detectionto become aware of the sensation resulting from adequate stimulation of the olfactory system3.1.48odour panelsee panelSIST EN 13725:2003

EN 13725:2003 (E)103.1.49odour unitone odour unit is the amount of (a mixture of) odorants present in one cubic metre of odorous gas (under standardconditions) at the panel thresholdNOTESee also "European odour unit".3.1.50odour thresholdsee panel threshold3.1.51odourless gassee neutral gas3.1.52olfactometerapparatus in which a sample of odorous gas is diluted with neutral gas in a defined ratio and presented toassessors3.1.53olfactometrymeasurement of the response of assessors to olfactory stimuli[ISO 5492]3.1.54olfactorypertaining to the sense of smell[ISO 5492]3.1.55olfactory receptorspecific part of the olfactory system which responds to an odorant (derived from ISO 5492)3.1.56olfactory stimulusthat which can excite an olfactory receptor (derived from ISO 5492)3.1.57on-line olfactometrysee direct olfactometry3.1.58operatorperson directly involved in operating the olfactometer and instructing the panel in olfactometry3.1.59panelgroup of panel members3.1.60panel memberassessor who is qualified to judge samples of odorous gas, using dynamic olfactometry within the scope of thisstandardSIST EN 13725:2003

EN 13725:2003 (E)113.1.61panel screeningprocedure to determine if the performance of panel members is in compliance with selection criteria. See alsopanel selection3.1.62panel selectionprocedure to determine which assessors are qualified as panel members3.1.63panel thresholddetection threshold applying to a panel3.1.64perceptionawareness of the effects of single or multiple sensory stimuli[ISO 5492]3.1.65performance testingdetermination of laboratory testing performance on reference materials against specified quality criteria3.1.66point sourcediscrete stationary source of emission of waste gases to atmosphere through canalised ducts of defined dimensionand air flow rate (e.g. chimneys, vents)3.1.67population (detection) thresholddetection threshold applying to the general population, if this population is not specified3.1.68precisioncloseness of agreement between independent test results obtained under prescribed conditions[ISO 5725-1]NOTEPrecision depends only on the distribution of random errors and does not relate to the true value or the acceptedreference value. The measure of precision is usually expressed in terms of imprecision and computed as a standard deviation ofthe test results. Higher imprecision is reflected by a larger standard deviation. ‘Independent test results’ means results obtainedin a manner not influenced by any previous result on the same or similar material.3.1.69presentationone presentation is the presentation of one dilution to one assessor (see Figure 1)3.1.70presentation seriespresentation of one dilution to all panel members in one round (see Figure 1)3.1.71presented gas flowgas flow presented to the assessor. It may be:¾ a diluted odour sample;¾ neutral gas (e.g. as a blank or reference air)SIST EN 13725:2003

EN 13725:2003 (E)123.1.72proficiency testingdetermination of laboratory testing performance by means of interlaboratory comparisons[EN 45020]3.1.73qualitytotality of features and characteristics of a product or service that bear on its ability to satisfy stated or impliedneeds[ISO 6879]3.1.74quality assuranceall those planned and systematic actions necessary to provide adequate confidence that a product, process orservice will satisfy given requirements for quality[ISO 6879]3.1.75random errorunpredictable errors which average to zero[ISO 5492]3.1.76recognition thresholdodour concentration which has a probability of 0,5 of being recognised under the conditions of the test (definitionnot applied in this standard)3.1.77reference materialsubstance or mixture of substances, the composition of which is known within specified limits, and one or more ofthe properties of which is sufficiently well established to be used for the calibration of an apparatus, theassessment of a measuring method, or for assigning values to materials (derived from ISO 6879)3.1.78reference valuesee accepted reference value3.1.79repeatabilityprecision under repeatability conditions[ISO 5725-1]3.1.80repeatability conditionsconditions where independent test results are obtained with the same method on identical test material in the samelaboratory by the same operator using the same equipment within short intervals of time[ISO 5725-1]3.1.81repeatability limitvalue less than or equal to which the absolute difference between two test results obtained under repeatabilityconditions may be expected to be with a probability of 0,95 (derived from ISO 5725-1)SIST EN 13725:2003

EN 13725:2003 (E)133.1.82reproducibilityprecision under reproducibility conditions[ISO 5725-1]3.1.83reproducibility conditionsconditions where test results are obtained with the same method on identical test material in different laboratorieswith different operators using different equipment[ISO 5725-1]3.1.84reproducibility limitvalue less than or equal to which absolute difference between two test results obtained under reproducibilityconditions may be expected to be with a probability of 0,95 (derived from ISO 5725-1)3.1.85responsible personperson, who is ultimately responsible for the total of olfactometry in a laboratory3.1.86roundone round is the presentation of one dilution series to all assessors3.1.87samplein the context of this standard, the sample is the odorous gas sample. It is an amount of gas which is assumed tobe representative of the gas mass or gas flow under investigation, and which is examined for odour concentration[ISO 6879]3.1.88sensory fatigueform of adaptation in which a decrease in sensitivity occurs[ISO 5492]3.1.89sensory referencepresented gas flow to which the diluted sample is compared3.1.90single measurementidentical to Measurement, see also test result3.1.91to smellto detect or to attempt to detect an odorant3.1.92standard conditions for olfactometryat room temperature (293 K), normal atmospheric pressure (101,3 kPa) on a wet basis (derived from ISO 10780)NOTEThis applies both to olfactometric measurements and volume flow rates of emissions. The conditions were chosenby convention, to reflect typical conditions for smell perception.SIST EN 13725:2003

EN 13725:2003 (E)143.1.93static olfactometerstatic olfactometer dilutes by mixing two known volumes of gas, odorous sample and neutral gas, respectively. Therate of dilution is calculated from the volumes3.1.94static dilutiondilution achieved by mixing two known volumes of gas, odorous sample and neutral gas, respectively. The rate ofdilution is calculated from the volumes3.1.95step factorfactor by which each dilution factor in a dilution series differs from adjacent dilutions3.1.96subjective methodany method in which the personal opinions are taken into consideration[ISO 5492]3.1.97substancespecies of matter of definite chemical composition (Hangartner, M, 1989, see Bibliography)3.1.98test resultvalue of a characteristic obtained by completely carrying out a specific measurement, once[ISO 5725-1]NOTEIn this standard the test result for one odour concentration measurement is the logarithm of the odour concentration:log10(cod). This conversion to logarithms is required for statistical calculations on specific parameters, as indicated in 3.2.3.1.99traceabilityproperty of the result of a measurement that can be related through an unbroken chain of comparisons toappropriate reference materials, generally national or international reference materials, using measurementstandards of successively increasing accuracy3.1.100truenesscloseness of agreement between the average value obtained from a large series of test results and an acceptedreference value[ISO 5725-1]NOTEThe measure of trueness usually is expressed in terms of bias.3.1.101true valuesee accepted reference value3.1.102yes/no methodolfactometric method in which assessors are asked to judge whether an odour is detected or not3.1.103zero samplesubstance or mixture of substances resembling, as closely as possible, the matrix of the actual air sample to bemeasured, but characterized by a value of the air quality characteristic which is not detectable by the method usedSIST EN 13725:2003

EN 13725:2003 (E)15[ISO 6879]NOTEIn practice, the value of the air quality characteristic is considered to be zero.Figure 1 - Diagram of various terms describing the elements of one (single) measurement foryes/no method and forced choice method3.2

Symbols and unitsThe symbols used in this standard are listed in the table below. Those parameters that are calculated from testresults obtained after log10 conversion of the underlying test results, see 5.3, are marked in the last column.SIST EN 13725:2003

EN 13725:2003 (E)16Table 1 — Symbols and unitsSymbolDescriptionUnitConversion of testresults to log10required?AAream2AdAccuracy of dilution instrumentsAodAccuracy of the odour measurementAwStatistical factor for calculation of accuracyAw,dStatistical factor for calculation of accuracy of dilutionBLaboratory component of biascodOdour concentrationouE/m3cod, cleanOdour c

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