BS ISO 21438-1:2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
   3.1 General definitions
   3.2 Particle size fraction definitions
   3.3 Sampling definitions
   3.4 Analytical definitions
   3.5 Statistical terms
4 Principle
5 Requirement
6 Reagents
7 Apparatus
   7.1 Sampling equipment
   7.2 Laboratory apparatus
8 Occupational exposure assessment
   8.1 General
   8.2 Personal sampling
   8.3 Static sampling
   8.4 Selection of measurement conditions and
        measurement pattern
9 Sampling
   9.1 Preliminary considerations
   9.2 Preparation for sampling
   9.3 Sampling position
   9.4 Collection of samples
   9.5 Transportation
10 Analysis
   10.1 Preparation of test and calibration solutions
   10.2 Instrumental analysis
   10.3 Estimation of detection and quantification
        limits
   10.4 Quality control
   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
   12.5 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

Describes a method for the determination of the time-weighted average mass concentration of sulfuric acid and phosphoric acid in workplace air by ion chromatography.

This part of ISO21438 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 method is applicable to the personal sampling of the inhalable fraction of airborne particles, as defined in ISO7708 and to static (area) sampling.

The analytical method is applicable to the determination of masses of 0,005mg to 2,0mg of sulfuric acid and phosphoric acid per sample, without dilution.

The concentration range of sulfuric acid and phosphoric acid in air for which the measuring procedure is applicable is determined by the sampling method selected by the user. For an air sample of volume1m³, the working range is approximately 0,005mg m⁻³ to 2,0mg m⁻³.

The method is not applicable to the determination of sulfur trioxide.

The procedure does not allow differentiation between the acids and their corresponding salts if both are present in the air.

The procedure does not allow differentiation between phosphoric acid and diphosphorus pentoxide (phosphoric anhydride) if both are present in the workplace.