ISO 21438-1:2007 PDF

Scope: This part of ISO 21438 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 ISO 7708 and to static (area) sampling. The analytical method is applicable to the determination of masses of 0,005 mg to 2,0 mg 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 volume 1 m3, the working range is approximately 0,005 mg m−3 to 2,0 mg 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.

ISO 21438-1:2007 Referenced Document

EN 13205 Workplace Atmospheres - Assessment of Performance of Instruments for Measurement of Airborne Particle Concentrations*， 2024-04-18 Update
ISO 1042 Laboratory glassware - One-mark volumetric flasks
ISO 3585 Borosilicate glass 3.3 - Properties
ISO 648 Laboratory glassware - Single-volume pipettes*， 2008-10-01 Update
ISO 7708:1995 Air quality - Particle size fraction definitions for health-related sampling
ISO 8655-1 Piston-operated volumetric apparatus — Part 1: Terminology, general requirements and user recommendations*， 2022-04-22 Update
ISO 8655-2 Piston-operated volumetric apparatus — Part 2: Pipettes*， 2022-04-22 Update
ISO 8655-6 Piston-operated volumetric apparatus — Part 6: Gravimetric reference measurement procedure for the determination of volume*， 2022-04-22 Update

2022 ISO 21438-1:2022 Workplace atmospheres — Determination of inorganic acids by ion chromatography — Part 1: Non-volatile acids (sulfuric acid and phosphoric acid)
2007 ISO 21438-1:2007 Workplace atmospheres - Determination of inorganic acids by ion chromatography - Part 1: Non-volatile acids (sulfuric acid and phosphoric acid)