ISO 21438-2:2009 PDF

Scope: This part of ISO 21438 specifies a method for the determination of the time-weighted average mass concentration of hydrogen chloride (HCl) gas and hydrochloric acid mist, hydrogen bromide (HBr) vapour and hydrobromic acid mist and nitric acid (HNO3) vapour and mist in workplace air by collection on an alkali- impregnated quartz fibre filter and analysis by ion chromatography. For mist sampling, 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 0,01 mg to 2,5 mg of HCl, HBr and HNO3 per sample. The range of concentrations of HCl, HBr and HNO3 in air for which the measuring procedure is applicable is determined by the sampling method selected by the user. For a 240 l air sample, the working range is approximately 0,04 mg⋅m−3 to 10 mg⋅m−3 for HCl, HBr and HNO3. The procedure is intended to differentiate between the acids and their corresponding salts. If both are present in the air, particulate salts are trapped on a pre-filter. Co-sampled particulate matter trapped on the pre-filter and/or deposited on the walls of the sampler may be analysed, if desired. Acids can react with co-sampled particulate matter on the pre-filter, causing interference with the measurement of the acid concentration.

ISO 21438-2:2009 Referenced Document

EN 13205 Workplace Atmospheres - Assessment of Performance of Instruments for Measurement of Airborne Particle Concentrations*， 2024-04-19 Update
ISO 1042 Laboratory glassware - One-mark volumetric flasks
ISO 3585 Borosilicate glass 3.3 - Properties
ISO 648 Laboratory glassware - Single-volume pipettes
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
ISO 8756 Air quality; handling of temperature, pressure and humidity data

2024 ISO 21438-2:2024 Workplace atmospheres
2009 ISO 21438-2:2009 Workplace atmospheres - Determination of inorganic acids by ion chromatography - Part 2: Volatile acids, except hydrofluoric acid (hydrochloric acid, hydrobromic acid and nitric acid)