ASTM D6246-01
(Practice)Standard Practice for Evaluating the Performance of Diffusive Samplers
Standard Practice for Evaluating the Performance of Diffusive Samplers
SCOPE
1.1 This practice covers the evaluation of the performance of diffusive samplers of gases and vapors for use over sampling periods from 4 to 12 h. Sampling periods of such duration are the most common in workplace sampling. Given a suitable exposure chamber, the practice can be straightforwardly extended to cover samplers for use over other sampling periods as well. The aim is to provide a concise set of experiments for classifying samplers primarily according to a single numerical value representing sampler accuracy. Accuracy estimates refer to conditions of sampler use which are normally expected in a workplace setting. These conditions may be characterized by the temperature, atmospheric pressure, humidity, and ambient wind speed, none of which may be constant or accurately known. Futhermore, the accuracy accounts for the estimation of time-weighed averages of concentrations which may not be constant in time. Aside from accuracy, the samplers are tested for compliance with the manufacturer's stated limits on capacity, possibly in the presence of interfering compounds. The samplers are, further, classified as to their capability for detecting situations in which sampler capacity may be exceeded.
1.2 This practice is an extension of previous research on diffusive samplers (1-13) as well as Practices D 4597, D 4598, D 4599, and MDHS 27. An essential advance here is the estimation of sampler accuracy under actual conditions of use. Furthermore, costs of sampler evaluation are reduced.
1.3 Furthering the latter point, knowledge of similarity between analytes of interest can be used to expedite sampler evaluation. For example, interpolation of data characterizing the sampling of analytes at separated points of a homologous series of compounds is recommended. At present the procedure of (9) is suggested. Following evaluation of a sampler in use at a single homologous series member according to the present practice, higher molecular weight members would receive partial validations considering sampling rate, capacity, analytical recovery, and interferences.
1.4 Units of the International System (SI) are used throughout this guide and should be regarded as 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D 6246 – 01
Standard Practice for
1
Evaluating the Performance of Diffusive Samplers
This standard is issued under the fixed designation D 6246; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 1.4 Units of the International System of Units (SI) are used
throughout this guide and should be regarded as standard.
1.1 This practice covers the evaluation of the performance
1.5 This standard does not purport to address all of the
of diffusive samplers of gases and vapors for use over sampling
safety concerns, if any, associated with its use. It is the
periods from 4 to 12 h. Sampling periods of such duration are
responsibility of the user of this standard to establish appro-
the most common in workplace sampling. Given a suitable
priate safety and health practices and determine the applica-
exposure chamber, the practice can be straightforwardly ex-
bility of regulatory limitations prior to use.
tended to cover samplers for use over other sampling periods as
well. The aim is to provide a concise set of experiments for
2. Referenced Documents
classifying samplers primarily according to a single numerical
2.1 ASTM Standards:
value representing sampler accuracy. Accuracy estimates refer
D 1356 Terminology Relating to Sampling and Analysis of
to conditions of sampler use which are normally expected in a
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Atmospheres
workplace setting. These conditions may be characterized by
D 4597 Practice for Sampling Workplace Atmospheres to
the temperature, atmospheric pressure, humidity, and ambient
Collect Organic Gases or Vapor with Activated Charcoal
wind speed, none of which may be constant or accurately
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Diffusive Samplers
known. Futhermore, the accuracy accounts for the estimation
D 4598 Practice for Sampling Workplace Atmospheres to
of time-weighted averages of concentrations which may not be
Collect Gases or Vapor with Liquid Sorbent Diffusional
constant in time. Aside from accuracy, the samplers are tested
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Samplers
for compliance with the manufacturer’s stated limits on capac-
D 4599 Practice for Measuring the Concentration of Toxic
ity, possibly in the presence of interfering compounds. The
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Gases or Vapors Using Length-of-Stain Dosimeters
samplers are, further, classified as to their capability for
2.2 International Standards:
detecting situations in which sampler capacity may be ex-
CEN EN 838 European Standard, Workplace atmospheres -
ceeded.
Diffusive samplers for the determination of gases or
1.2 This practice is an extension of previous research on
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2 vapours - Requirements and test methods
diffusive samplers (1-13) as well as Practices D 4597, D 4598,
MDHS 27 Protocol for assessing the performance of a
D 4599, and MDHS 27. An essential advance here is the
diffusive sampler, Health and Safety Laboratory, United
estimation of sampler accuracy under actual conditions of use.
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Kingdom
Futhermore, costs of sampler evaluation are reduced.
MDHS 80 Volatile organic compounds in air, Health and
1.3 Furthering the latter point, knowledge of similarity
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Safety Laboratory, United Kingdom
between analytes of interest can be used to expedite sampler
evaluation. For example, interpolation of data characterizing
3. Terminology
the sampling of analytes at separated points of a homologous
3.1 Definitions:
series of compounds is recommended. At present the procedure
3.1.1 For definitions of terms used in this practice, refer to
of (9) is suggested. Following evaluation of a sampler in use at
Terminology D 1356.
a single homologous series member according to the present
3.2 Definitions of Terms Specific to This Standard:
practice, higher molecular weight members would receive
3.2.1 Busch Probabilistic Accuracy A—the fractional range,
partial validations considering sampling rate, capacity, analyti-
symmetric about the true concentration c, within which 95 %
cal recovery, and interferences.
of sampler measurements are to be found (14-16).
3.2.1.1 Discussion—In the case considered here, effects on
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This practice is under the jurisdiction of ASTM Committee D22 on Sampling
and Analysis of Atmospheresand is the direct responsibility of Subcommittee
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D22.04 on Workplace Atmospheres. Annual Book of ASTM Standards, Vol 11.03.
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Current edition approved October 10, 2001. Published December 2001. Origi- Discontinued–See 1995 Annual Book of ASTM Standards, Vol 11.03.
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nally published as D 6246 – 98. Last previous edition D 6246 – 98. Available from CEN Central Secretariat, rue de Stassart 36, B-1050 Brussels,
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The boldface numbers in parentheses refer to the list of references at the end of Belgium.
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