ISO 23320:2022
Workplace air — Gases and vapours — Requirements for evaluation of measuring procedures using diffusive samplers
This document specifies performance requirements and test methods under prescribed laboratory conditions for the evaluation of diffusive samplers (see Reference [1]) and of procedures using these samplers for the determination of gases and vapours in workplace atmospheres (see Reference [2]).
This document is applicable to diffusive samplers and measuring procedures using these samplers, such as ISO 16200‑2 and ISO 16017‑2, in which sampling and analysis are carried out in separate stages.
This document is not applicable to
— diffusive samplers which are used for the direct determination of concentrations, and
— diffusive samplers which rely on sorption into a liquid.
This document addresses requirements for method developers and/or manufacturers.
NOTE For the purposes of this document a manufacturer can be any commercial or non-commercial entity.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Types of samplers
6 Requirements
6.1 General
6.2 Sampler requirements
6.2.1 Nominal uptake rate
6.2.2 Air velocity/sampler orientation
6.2.3 Sampler leak test
6.2.4 Shelf life
6.2.5 Sampler identification (for commercially available diffusive samplers)
6.2.6 Marking
6.2.7 Instructions for use
6.3 Measuring procedure requirements
6.3.1 Sampling procedure requirements
6.3.2 Analytical procedure requirements
6.3.3 Expanded uncertainty
6.3.4 Method description
7 General test conditions
7.1 Reagents
7.2 Apparatus
7.3 Independent method
7.4 Generation of a calibration gas mixture
7.4.1 General
7.4.2 Determination of mass concentration
8 Test methods
8.1 General
8.2 Sampler test methods
8.2.1 Determination of (nominal) uptake rate
8.2.2 Air velocity
8.2.3 Sampler leak test
8.2.4 Shelf life (for Type A impregnated supports)
8.2.5 Sampler identification
8.2.6 Marking
8.2.7 Instructions for use
8.3 Measuring procedure test methods
8.3.1 Determination of the sampling conditions
8.3.2 Analytical procedure test methods
8.3.3 Method recovery and method precision
8.4 Uncertainty of measurement
8.4.1 Identification of random and non-random uncertainty components
8.4.2 Estimation of individual uncertainty components
8.4.3 Calculation of expanded uncertainty
9 Test report
Annex A (informative) Fundamentals of diffusive sampling
Annex B (informative) Estimation of uncertainty of measurement
Annex C (informative) Calculation of uptakes rates from diffusion coefficients
Annex D (informative) Example of estimation of expanded uncertainty
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Types of samplers
6 Requirements
6.1 General
6.2 Sampler requirements
6.2.1 Nominal uptake rate
6.2.2 Air velocity/sampler orientation
6.2.3 Sampler leak test
6.2.4 Shelf life
6.2.5 Sampler identification (for commercially available diffusive samplers)
6.2.6 Marking
6.2.7 Instructions for use
6.3 Measuring procedure requirements
6.3.1 Sampling procedure requirements
6.3.2 Analytical procedure requirements
6.3.3 Expanded uncertainty
6.3.4 Method description
7 General test conditions
7.1 Reagents
7.2 Apparatus
7.3 Independent method
7.4 Generation of a calibration gas mixture
7.4.1 General
7.4.2 Determination of mass concentration
8 Test methods
8.1 General
8.2 Sampler test methods
8.2.1 Determination of (nominal) uptake rate
8.2.2 Air velocity
8.2.3 Sampler leak test
8.2.4 Shelf life (for Type A impregnated supports)
8.2.5 Sampler identification
8.2.6 Marking
8.2.7 Instructions for use
8.3 Measuring procedure test methods
8.3.1 Determination of the sampling conditions
8.3.2 Analytical procedure test methods
8.3.3 Method recovery and method precision
8.4 Uncertainty of measurement
8.4.1 Identification of random and non-random uncertainty components
8.4.2 Estimation of individual uncertainty components
8.4.3 Calculation of expanded uncertainty
9 Test report
Annex A (informative) Fundamentals of diffusive sampling
Annex B (informative) Estimation of uncertainty of measurement
Annex C (informative) Calculation of uptakes rates from diffusion coefficients
Annex D (informative) Example of estimation of expanded uncertainty
Bibliography