ISO 21438-1:2022
Workplace atmospheres — Determination of inorganic acids by ion chromatography — Part 1: Non-volatile acids (sulfuric acid and phosphoric acid)
This document specifies a method for the determination of the time-weighted average mass concentration of sulfuric acid and phosphoric acid in workplace air by ion chromatography. The anions are detected by conductivity.
The method is applicable to the personal sampling of airborne particles, as defined in ISO 7708, and to static (area) sampling.
The method does not apply to the determination of sulfur trioxide.
The procedure does not differentiate between the acids and their corresponding salts if both are present in the workplace air.
The procedure does not differentiate between phosphoric acid and diphosphorus pentoxide (phosphoric anhydride) if both are present in the workplace air.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Requirement
6 Reagents
7 Apparatus
7.1 Sampling equipment
7.2 Laboratory apparatus
8 Occupational exposure assessment
9 Sampling
9.1 Preliminary considerations
9.1.1 Selection and use of samplers
9.1.2 Sampling period
9.1.3 Effect of temperature and pressure on flow rate measurements
9.1.4 Sample handling
9.1.5 Sampling interferences
9.2 Preparation for sampling
9.2.1 Cleaning of samplers
9.2.2 Loading the samplers with filters
9.2.3 Setting the volumetric flow rate
9.2.4 Field blanks
9.3 Sampling position
9.3.1 Personal sampling
9.3.2 Static sampling
9.4 Collection of samples
9.5 Transportation
9.5.1 Samplers that collect airborne particles on the filter
9.5.2 Samplers with an internal filter cassette
9.5.3 Samplers of the disposable cassette type
9.5.4 Transport of samples to the laboratory
10 Analysis
10.1 Preparation of test, calibration solutions and filter samples
10.1.1 General
10.1.2 Quartz fibre filters
10.1.3 PVC and PTFE filters
10.1.4 Preparation of calibration solutions
10.2 Instrumental analysis
10.3 Estimation of detection and quantification limits
10.3.1 Estimation of the instrumental detection limits
10.3.2 Estimation of the method detection limit and quantification limit
10.4 Quality control
10.4.1 Reagent blanks and laboratory blanks
10.4.2 Quality control solutions
10.4.3 Certified reference materials
10.4.4 External quality assessment
10.5 Measurement uncertainty
11 Expression of results
12 Method performance
12.1 Sample collection and stability
12.2 Quantification limits
12.3 Upper limits of the analytical range
12.4 Bias and precision
12.4.1 Analytical bias
12.4.2 Analytical precision
12.5 Uncertainty of sampling and analysis method
12.6 Interferences
13 Test report
13.1 Test record
13.2 Laboratory report
Annex A (informative) Temperature and pressure correction
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Requirement
6 Reagents
7 Apparatus
7.1 Sampling equipment
7.2 Laboratory apparatus
8 Occupational exposure assessment
9 Sampling
9.1 Preliminary considerations
9.1.1 Selection and use of samplers
9.1.2 Sampling period
9.1.3 Effect of temperature and pressure on flow rate measurements
9.1.4 Sample handling
9.1.5 Sampling interferences
9.2 Preparation for sampling
9.2.1 Cleaning of samplers
9.2.2 Loading the samplers with filters
9.2.3 Setting the volumetric flow rate
9.2.4 Field blanks
9.3 Sampling position
9.3.1 Personal sampling
9.3.2 Static sampling
9.4 Collection of samples
9.5 Transportation
9.5.1 Samplers that collect airborne particles on the filter
9.5.2 Samplers with an internal filter cassette
9.5.3 Samplers of the disposable cassette type
9.5.4 Transport of samples to the laboratory
10 Analysis
10.1 Preparation of test, calibration solutions and filter samples
10.1.1 General
10.1.2 Quartz fibre filters
10.1.3 PVC and PTFE filters
10.1.4 Preparation of calibration solutions
10.2 Instrumental analysis
10.3 Estimation of detection and quantification limits
10.3.1 Estimation of the instrumental detection limits
10.3.2 Estimation of the method detection limit and quantification limit
10.4 Quality control
10.4.1 Reagent blanks and laboratory blanks
10.4.2 Quality control solutions
10.4.3 Certified reference materials
10.4.4 External quality assessment
10.5 Measurement uncertainty
11 Expression of results
12 Method performance
12.1 Sample collection and stability
12.2 Quantification limits
12.3 Upper limits of the analytical range
12.4 Bias and precision
12.4.1 Analytical bias
12.4.2 Analytical precision
12.5 Uncertainty of sampling and analysis method
12.6 Interferences
13 Test report
13.1 Test record
13.2 Laboratory report
Annex A (informative) Temperature and pressure correction
Bibliography