International Standard
ISO 21438-1:2022
Workplace atmospheres — Determination of inorganic acids by ion chromatography — Part 1: Non-volatile acids (sulfuric acid and phosphoric acid)
Reference number
ISO 21438-1:2022
Edition 2
International Standard
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ISO 21438-1:2022
Published (Edition 2, 2022)

ISO 21438-1:2022

ISO 21438-1:2022
CHF 129
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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.

General information

  •  : Published
     : 2022-05
    : International Standard published [60.60]
  •  : 2
     : 22
  • ISO/TC 146/SC 2
  • RSS updates

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