ASTM-D6246 2002

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D6246-02 Standard Practice for Evaluating the Performance of Diffusive Samplers

Published By	Publication Date	Number of Pages
ASTM	2002	8

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Categories: 13.040.30 - Workplace atmospheres, ASTM

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Description

ASTM D6246-02

Historical Standard: Standard Practice for Evaluating the Performance of Diffusive Samplers

ASTM D6246

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 and for wind speeds less than 0.5 m/s. Such sampling periods and wind speeds are the most common in the indoor workplace setting. Given a suitable exposure chamber, the practice can be extended to cover sampler use for other sampling periods and conditions. The aim is to provide a concise set of experiments for classifying samplers primarily in accordance with a single sampler accuracy figure. Accuracy is defined (3.2.1) in this standard so as to take into account both imprecision and uncorrected bias. 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 when the sampler is used in the field. Futhermore, the accuracy accounts for the effects of diffusive loss of analyte on the estimation of time-weighted 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.

1.2 This practice is an extension of previous research on diffusive samplers (1-14)² 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. Futhermore, the costs of sampler evaluation are reduced.

1.3 Knowledge gained from similar analytes expedites 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. The test for diffusive analyte loss can be omitted if the effect is found negligible for a given sampler or analyte series.

1.4 Units of the International System of Units (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.

Keywords

accuracy; air monitoring; bias; concentration; diffusive; evaluation; gases; passive; performance; precision; sampling and anlalysis; samplers; tests; uncertainty; vapors; workplace atmospheres

ICS Code

ICS Number Code 13.040.30 (Workplace atmospheres)

DOI: 10.1520/D6246-02

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Method
4	Significance and Use Apparatus Reagents and Materials
5	Procedure Sampler Performance Classification Accuracy
6	Report Keywords A1. WORKED EXAMPLE: PROGRAM FOR DIFFUSIVE SAMPLER ACCURACY RANGE CALCULATION A1.1
7	TABLE A1.1 TABLE A1.2
8	REFERENCES

Additional information

Standard Title	D6246-02 Standard Practice for Evaluating the Performance of Diffusive Samplers
Published Code	ASTM
Publication Date	2002
Pages Count	8
ICS Codes	13.040.30 - Workplace atmospheres