BS ISO 16740:2005

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 Reactions
6 Requirement
7 Reagents
8 Apparatus
   8.1 Sampling equipment
   8.2 Laboratory apparatus
9 Occupational exposure assessment
   9.1 General
   9.2 Personal sampling
   9.3 Static sampling
   9.4 Selection of measurement conditions and measurement
        pattern
10 Sampling method
   10.1 Preliminary considerations
   10.2 Preparation for sampling
   10.3 Sampling position
   10.4 Collection of samples
   10.5 Transportation
11 Analysis
   11.1 Analytical requirements
   11.2 Preparation of solutions for determination of soluble
        hexavalent chromium compounds
   11.3 Preparation of solutions for determination of insoluble
        hexavalent chromium compounds
   11.4 Instrumental analysis
   11.5 Estimation of detection and quantification limits
   11.6 Quality control
   11.7 Measurement uncertainty
12 Expression of results
13 Method performance
   13.1 Sample collection and stability
   13.2 Hotplate extraction
   13.3 Ultrasonic extraction
   13.4 Interferences
14 Special cases
   14.1 Spray-painting
   14.2 Action to be taken when particles have become dislodged
        from the filter during transportation
15 Test report
   15.1 Test record
   15.2 Laboratory report
Annex A (informative) Temperature and pressure corrections
Annex B (informative) Background on methods for determination
                      of hexavalent chromium in air and guidance
                      on their use
Bibliography

Defines a method for the determination of the time-weighted average mass concentration of hexavalent chromium in workplace air.

This International Standard specifies a method for the determination of the time-weighted average mass concentration of hexavalent chromium in workplace air.

Separate sample preparation methods are specified for the extraction of soluble and insoluble hexavalent chromium. The method for insoluble hexavalent chromium can also be used to prepare samples for determination of total hexavalent chromium, if desired.

This International Standard 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 0,01µg to 10µg of hexavalent chromium per sample, without dilution.

The concentration range of hexavalent chromium in air for which the measuring procedure is applicable is determined by the sampling method selected by the user (see 10.1). For a 1m³ air sample, without sample dilution, the working range is approximately 0,01µg·m⁻³ to 10µg·m⁻³.