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ASTM D6561-20

(Test Method)

Standard Test Method for Determination of Aerosol Monomeric and Oligomeric Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-2–phenyl-1) Piperazine (MOPIP) in the Workplace

Standard Test Method for Determination of Aerosol Monomeric and Oligomeric Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-2–phenyl-1) Piperazine (MOPIP) in the Workplace

SIGNIFICANCE AND USE
5.1 HDI is mostly used in the preparation of paints. The use of isocyanates and their industrial needs have been in constant growth.  
5.2 Diisocyanates and polyisocyanates are irritants to skin, eyes, and mucous membranes. They are recognized to cause respiratory allergic sensitization, asthmatic bronchitis, and acute respiratory intoxication (3-6).  
5.3 The American Conference of Governmental Industrial Hygienists (ACGIH) has adopted a threshold limit value–time weighted average (TLV-TWA) of 0.005 ppm (V) or 0.034 mg/m3 for monomeric HDI (7). The Occupational Safety & Health Administration of the U.S. Department of Labor (OSHA) has not listed a permissible exposure limit (PEL) for HDI (8).  
5.4 In any case, there are not separate exposure standards for vapor and aerosol. Therefore, in comparing the results for isocyanate against a standard, results from the two fractions should be combined to give a single total value.  
5.5 Due to its low LOD and low required volume (15 L), this test method is well suited for monitoring of respiratory and other problems related to diisocyanates and polyisocyanates. Its short sampling times are compatible with the duration of many industrial processes, and its low detection limit with the concentrations often found in the working area.
SCOPE
1.1 This test method covers the determination of aerosol hexamethylene diisocyanate (HDI) in air samples collected from workplace and ambient atmospheres. The method described in this test method collects separate fractions. One fraction will be dominated by vapor, and the other fraction will be dominated by aerosol. The results obtained from the analysis of the separate fractions do not necessarily represent the true partition of the measured HDI physical phases, and should only be considered a representation of the general trend in the physical phase partition within samples. The analyses of the two fractions are different, and are provided in separate, linked, standards to avoid confusion. This test method is principally used to determine short term exposure (15 min) of HDI in workplace environments for personal monitoring or in ambient air. The analysis of the vapor fraction is performed separately, as described in Test Method D6562.  
1.2 Differential air sampling is performed with a segregating device. The aerosol fraction is collected on a polytetrafluoroethylene (PTFE) filter.  
1.3 The analysis of the aerosol fraction is performed by using a high performance liquid chromatograph (HPLC) equipped with an ultraviolet (UV) detector. An ultra high performance liquid chromatograph (UPLC) can also be used, provided that its performance is equivalent to what is stated in this standard. The range of application of the test method has been validated from 0.052 to 1.04 μg of monomeric HDI/mL, which corresponds, based on a 15 L air sample, to concentrations from 0.004 to 0.070 mg/m3 of HDI. Those concentrations correspond to a range of aerosol phase concentrations from 0.5 ppb (V) to 10 ppb (V) and cover the established threshold limit valve (TLV) value of 5 ppb (V).  
1.4 The quantification limit for the monomeric HDI is 0.041 μg per mL, which corresponds to 0.003 mg/m3 for a 15 L sampled air volume. This value is equivalent to ten times the standard deviation obtained from ten measurements carried out on a standard solution in contact with the PTFE filter whose concentration of 0.1 μg/mL is close to the expected detection limit.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See Section 9 for additional hazards.  
1.7 This intern...

General Information

Status
Published
Publication Date
29-Feb-2020
ICS
13.040.30 - Workplace atmospheres
Technical Committee
D22 - Air Quality
Drafting Committee
D22.04 - Workplace Air Quality
Current Stage
Ref Project

Relations

Refers
ASTM D6562-20 - Standard Test Method for Determination of Gaseous Hexamethylene Diisocyanate (HDI) in Air with 9-(N-methylaminomethyl) Anthracene Method (MAMA) in the Workplace
Effective Date
01-Mar-2020
Refers
ASTM D1356-20a - Standard Terminology Relating to Sampling and Analysis of Atmospheres
Effective Date
01-Sep-2020
Refers
ASTM D1356-20 - Standard Terminology Relating to Sampling and Analysis of Atmospheres
Effective Date
15-Mar-2020

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ASTM D6561-20 - Standard Test Method for Determination of Aerosol Monomeric and Oligomeric Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-2–phenyl-1) Piperazine (MOPIP) in the WorkplaceASTM D6561-20 - Standard Test Method for Determination of Aerosol Monomeric and Oligomeric Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-2–phenyl-1) Piperazine (MOPIP) in the Workplace
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ASTM D6561-20 - Standard Test Method for Determination of Aerosol Monomeric and Oligomeric Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-2–phenyl-1) Piperazine (MOPIP) in the Workplace
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REDLINE ASTM D6561-20 - Standard Test Method for Determination of Aerosol Monomeric and Oligomeric Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-2–phenyl-1) Piperazine (MOPIP) in the WorkplaceREDLINE ASTM D6561-20 - Standard Test Method for Determination of Aerosol Monomeric and Oligomeric Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-2–phenyl-1) Piperazine (MOPIP) in the Workplace
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REDLINE ASTM D6561-20 - Standard Test Method for Determination of Aerosol Monomeric and Oligomeric Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-2–phenyl-1) Piperazine (MOPIP) in the Workplace
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Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6561 − 20
Standard Test Method for
Determination of Aerosol Monomeric and Oligomeric
Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-
1
2–phenyl-1) Piperazine (MOPIP) in the Workplace
This standard is issued under the fixed designation D6561; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope sampled air volume. This value is equivalent to ten times the
standarddeviationobtainedfromtenmeasurementscarriedout
1.1 This test method covers the determination of aerosol
on a standard solution in contact with the PTFE filter whose
hexamethylene diisocyanate (HDI) in air samples collected
concentration of 0.1 µg/mL is close to the expected detection
from workplace and ambient atmospheres. The method de-
limit.
scribed in this test method collects separate fractions. One
fractionwillbedominatedbyvapor,andtheotherfractionwill 1.5 The values stated in SI units are to be regarded as
be dominated by aerosol. The results obtained from the standard. No other units of measurement are included in this
analysis of the separate fractions do not necessarily represent standard.
the true partition of the measured HDI physical phases, and
1.6 This standard does not purport to address all of the
shouldonlybeconsideredarepresentationofthegeneraltrend
safety concerns, if any, associated with its use. It is the
in the physical phase partition within samples.The analyses of
responsibility of the user of this standard to establish appro-
the two fractions are different, and are provided in separate,
priate safety, health, and environmental practices and deter-
linked, standards to avoid confusion. This test method is
mine the applicability of regulatory limitations prior to use.
principally used to determine short term exposure (15 min) of
See Section 9 for additional hazards.
HDI in workplace environments for personal monitoring or in
1.7 This international standard was developed in accor-
ambient air. The analysis of the vapor fraction is performed
dance with internationally recognized principles on standard-
separately, as described in Test Method D6562.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.2 Differential air sampling is performed with a segregat-
mendations issued by the World Trade Organization Technical
ing device.The aerosol fraction is collected on a polytetrafluo-
Barriers to Trade (TBT) Committee.
roethylene (PTFE) filter.
1.3 The analysis of the aerosol fraction is performed by
2. Referenced Documents
using a high performance liquid chromatograph (HPLC)
2
2.1 ASTM Standards:
equipped with an ultraviolet (UV) detector. An ultra high
D1193Specification for Reagent Water
performance liquid chromatograph (UPLC) can also be used,
D1356Terminology Relating to Sampling and Analysis of
provided that its performance is equivalent to what is stated in
Atmospheres
this standard. The range of application of the test method has
D1357Practice for Planning the Sampling of the Ambient
been validated from 0.052 to 1.04 µg of monomeric HDI/mL,
Atmosphere
which corresponds, based on a 15 L air sample, to concentra-
3
D4840Guide for Sample Chain-of-Custody Procedures
tionsfrom0.004to0.070mg/m ofHDI.Thoseconcentrations
D5337Practice for Flow RateAdjustment of Personal Sam-
correspondtoarangeofaerosolphaseconcentrationsfrom0.5
pling Pumps
ppb(V)to10ppb(V)andcovertheestablishedthresholdlimit
D6562Test Method for Determination of Gaseous Hexam-
valve (TLV) value of 5 ppb (V).
ethylene Diisocyanate (HDI) in Air with 9-(N-
1.4 ThequantificationlimitforthemonomericHDIis0.041
3 methylaminomethyl)Anthracene Method (MAMA) in the
µg per mL, which corresponds to 0.003 mg/m fora15L
Workplace
1
This test method is under the jurisdiction of ASTM Committee D22 on Air
Quality and is the direct responsibility of Subcommittee D22.04 on WorkplaceAir
2
Quality. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 1, 2020. Published May 2020. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2000. Last previous edition approved in 2016 as D6561–06 (2016). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D6561-20. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

-------------------
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6561 − 06 (Reapproved 2016) D6561 − 20
Standard Test Method for
Determination of Aerosol Monomeric and Oligomeric
Hexamethylene Diisocyanate (HDl) in Air with (Methoxy-
1
2–phenyl-1) Piperazine (MOPIP) in the Workplace
This standard is issued under the fixed designation D6561; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers the determination of aerosol hexamethylene diisocyanate (HDI) in air samples collected from
workplace and ambient atmospheres. The method described in this test method collects separate fractions. One fraction will be
dominated by vapor, and the other fraction will be dominated by aerosol. It is not known at the present time whether this represents
a perfect separation of vapor and aerosol, and in any case, there are not separate exposure standards for vapor and aerosol.
Therefore, in comparing the results for isocyanate against a standard, results from the two fractions should be combined to give
a single total value. The reason for splitting the sample into two fractions is to increase analytic sensitivity for the vapor fraction
and also to give the hygienist or ventilation engineer some information concerning the likely state of the isocyanate species. The
results obtained from the analysis of the separate fractions do not necessarily represent the true partition of the measured HDI
physical phases, and should only be considered a representation of the general trend in the physical phase partition within samples.
The analyses of the two fractions are different, and are provided in separate, linked, standards to avoid confusion. This test method
is principally used to determine short term exposure (15 min) of HDI in workplace environments for personal monitoring or in
ambient air. The analysis of the vapor fraction is performed separately, as described in Test Method D6562.
1.2 Differential air sampling is performed with a segregating device. The aerosol fraction is collected on a polytetrafluoroeth-
ylene (PTFE) filter.
1.3 Immediately after sampling, the PTFE filter is transferred into a jar containing a (methoxy-2 phenyl-1) piperazine (MOPIP)
solution in toluene.
1.3 The analysis of the aerosol fraction is performed by using a high performance liquid chromatograph (HPLC) equipped with
an ultraviolet (UV) detector. An ultra high performance liquid chromatograph (UPLC) can also be used, provided that its
performance is equivalent to what is stated in this standard. The range of application of the test method has been validated from
0.052 to 1.04 μg of monomeric HDI/mL, which corresponds, based on a 15 L air sample, to concentrations from 0.004 to 0.070
3
mg/m of HDI. Those concentrations correspond to a range of aerosol phase concentrations from 0.5 ppb (V) to 10 ppb (V) and
cover the established threshold limit valve (TLV) value of 5 ppb (V).
3
1.4 The quantification limit for the monomeric HDI is 0.041 μg per mL, which corresponds to 0.003 mg/m for a 15 L sampled
air volume. This value is equivalent to ten times the standard deviation obtained from ten measurements carried out on a standard
solution in contact with the PTFE filter whose concentration of 0.1 μg/mL is close to the expected detection limit.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. See Section 9 for additional hazards.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1
This test method is under the jurisdiction of ASTM Committee D22 on Air Quality and is the direct responsibility of Subcommittee D22.04 on Workplace Air Quality.
Current edition approved Nov. 1, 2016March 1, 2020. Published November 2016May 2020. Originally approved
...

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ASTM
ASTM D8404-21(Practice)
Standard Practice for Preparation of Soil Samples by Ammonium Bifluoride-Nitric Acid Digestion for Subsequent Analysis for Metals and Metalloids

SIGNIFICANCE AND USE
5.1 There is a need to monitor the content of metals and metalloids in order to determine the presence of potential hazards. Hence, effective and efficient methods are required for the preparation of soil samples for determination of metals and metalloids present therein.  
5.2 This practice may be used for the digestion of soil samples that are collected during various construction and renovation and hazard survey activities in and around buildings and related structures. The practice is also suitable for the digestion of soil samples for metal and metalloid analyses collected from other locations, such as near roads and steel structures. For some other extraction procedures, see Practices D3974.  
5.3 This practice is intended to be used to prepare samples that have been collected for hazard assessment purposes but may be used for other applications such as, for example, monitoring the effectiveness of remediation activities.  
5.4 This practice may be capable of determining metals and metalloids bound within matrices, such as silica, that are not soluble in nitric acid alone.  
5.5 This practice includes drying and homogenization steps to help assure that reported results are representative of the sample and are independent of potential differences in soil moisture levels among different sampling locations or changing weather conditions.
SCOPE
1.1 This practice covers drying, homogenization, and ammonium bifluoride-nitric acid digestion of soil samples and associated quality control (QC) samples for the determination of metals and metalloids using laboratory atomic spectrometry analysis techniques such as inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma atomic emission spectrometry (ICP-AES), flame atomic absorption spectrometry (FAAS), and graphite furnace atomic absorption spectrometry (GFAAS). For ammonium bifluoride-nitric acid digestion of airborne dust and dust-wipe samples for the determination of metals and metalloids, see Practice D8344.  
1.2 This practice is based on U.S. EPA SW 846, Test Method 3050, Test Method D7202, and Practice D8344.  
1.3 This practice contains notes that are explanatory and are not part of the mandatory requirements of this standard.  
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D8405-21(Test Method)
Standard Test Method for Evaluating PM2.5 Sensors or Sensor Systems Used in Indoor Air Applications

SIGNIFICANCE AND USE
5.1 Poor indoor air quality has been implicated in significant adverse acute and chronic impacts on occupant health and performance. The ability to assess the components contributing to poor indoor air quality is critical for determining best practices for improving indoor air quality.  
5.2 Measurement of pollutants in indoor environments using sensors and sensor systems provides information needed to improve indoor air quality through pollutant source control, ventilation, filtration or other treatments.  
5.3 This method uses a test characterization chamber system equipped with reference monitor(s) to evaluate the response of test sensors or test sensor systems to specific types of particles (for example, salt, polystyrene latex, or dust). To facilitate reproducible results, the test particles used within this method are standardized and have known properties. The user is cautioned that a single particle type is not representative of all particles found indoors. The relative response of test sensors or test sensor systems to a reference monitor can vary by a factor of two for different particle types (for example, primary or secondary, organic or inorganic, outdoor or indoor origin; see 6.11.3 for further discussion). Furthermore, the user is cautioned that the lower limit of particle size detection for optical test sensors and test sensor systems is generally 0.3 μm in diameter; particles below this size are generally undetected and may represent a significant health concern as well.
SCOPE
1.1 This test method uses a chamber system to evaluate the performance of stationary PM2.5 sensors (sensors) and particle sensor systems (sensor systems) subjected to various test conditions, including temperature, relative humidity, PM2.5 concentration, and coarse PM interferent concentration.  
1.1.1 This test method covers sensors and sensor systems that can be continuously powered and continuously operated for the duration of any test described in this method through line power or an internal battery of sufficient output. This test method is not meant to evaluate sensors or sensor systems without these capabilities.  
1.1.2 This test method evaluates the performance of sensors and sensor systems that allow users to collect data in a systemic manner to assess the capabilities and limitations of these devices.  
1.1.3 This test method is not meant to evaluate sensors or sensor systems without data storage and recording capabilities.  
1.1.4 This test method is not intended to evaluate indoor air quality sensors and sensor systems for purposes of regulation of outdoor air, homeland security, law enforcement or forensic activity.  
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D7659-21(Guide)
Standard Guide for Strategies for Surface Sampling of Metals and Metalloids for Worker Protection

SIGNIFICANCE AND USE
4.1 This guide describes approaches which can be used to determine surface sampling strategies before any actual surface sampling occurs. The strategy selection process needs to consider a number of factors, including, but not limited to, purpose for sampling, fitness of the sampling strategy for that purpose, data quality objectives and how the data will be used, ability to execute the selected strategy, and ability of the analytical laboratory (fixed-site or in-field) to analyze the samples once they are collected.  
4.2 For the purposes of sampling, and for the materials sampled, surface sampling strategies are matters of choice. Workplace sampling may be performed for single or multiple purposes. Conflicts may arise when a single sampling strategy is expected to satisfy multiple purposes.  
4.2.1 Limitations of cost, space, power requirements, equipment, personnel, and analytical methods need to be considered to arrive at an optimum strategy for each purpose.  
4.2.2 A strategy intended to satisfy multiple purposes will typically be a compromise among several alternatives, and will typically not be optimal for any one purpose.  
4.2.3 The purpose or purposes for sampling should be explicitly stated before a sampling strategy is selected. Good practice, regulatory and legal requirements, cost of the sampling program, and the usefulness of the results may be markedly different for different purposes of sampling.  
4.3 This guide is intended for those who are preparing to evaluate a workplace environment by collecting samples of metals or metalloids on surfaces, or who wish to obtain an understanding of what information can be obtained by such sampling.  
4.4 This guide cannot take the place of sound professional judgment in development and execution of any sampling strategy. In most instances, a strategy based on a standard practice or method will need to be adjusted due to conditions encountered in the field. Documentation of any professional judgments appl...
SCOPE
1.1 This guide provides criteria to be used in defining strategies for sampling for metals and metalloids on surfaces for workplace health and safety monitoring or evaluation.  
1.2 Guidance provided by this standard is intended for sampling of metals and metalloids on surfaces for subsequent analysis using methods such as atomic spectrometry, mass spectrometry, X-ray fluorescence, or molecular fluorescence. Guidance for evaluation of data after sample analysis is included.  
1.3 Sampling for volatile organometallic species (for example, trimethyl tin) is not within the scope of this guide.  
1.4 Sampling to determine levels of metals or metalloids on the skin is not within the scope of this guide.  
1.5 Sampling for airborne particulate matter is not within the scope of this guide. Guide E1370 provides information on air sampling strategies.  
1.6 Where surface sampling is prescribed by law or regulation, this guide is not intended to take the place of any requirements that may be specified in such law or regulation.  
1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D4766-21(Test Method)
Standard Test Method for Vinyl Chloride in Workplace Atmospheres (Charcoal Tube Method)

SIGNIFICANCE AND USE
5.1 Vinyl chloride monomer (VCM) is the starting material for the manufacture of poly(vinyl chloride) (PVC), which is used extensively in construction, electronics, packaging, and other industries. The vinyl chloride gas can escape during manufacturing, transportation, and polymerization stages. Residual monomer can also escape during subsequent fabrication processes.  
5.2 Vinyl chloride is a toxic and explosive hazardous material.  
5.3 Vinyl chloride is suspected to be a carcinogenic agent (4), and occupational exposure limits (OELs) have been established for this agent. For instance, the present U.S. Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL) for VCM is 1.0 ppm (v) with a 0.5-ppm (v) action level; the maximum length of operator exposure at 5 ppm (v) is 15 min (5).  
5.4 This test method is made selective for vinyl chloride by choosing chromatographic columns that will separate vinyl chloride from other organic compounds in the sample.  
5.5 This test method meets requirements (for example, those of OSHA and NIOSH) for monitoring workplace atmospheres in vinyl chloride and poly(vinyl chloride) production and fabrication processes.
SCOPE
1.1 This test method describes the determination of vinyl chloride monomer (VCM) in workplace atmospheres using a modified charcoal tube method (see Practice D3686).  
1.2 This procedure is compatible with low-flow rate personal sampling equipment. It can be used for personal or stationary monitoring. It cannot be used to determine instantaneous fluctuations in concentration to detect maximum values. Alternative on-site procedures, such as gas chromatography or infrared spectrometry, are required to measure fast-changing concentrations.  
1.3 The range of this test method is from the limit of quantitation approximately 0.03 to 100 ppm (v).  
1.4 The sampling method provides a time-weighted average sample.  
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For more specific precautionary statements, see Section 9, 10.2.3, and 11.1.3.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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