ISO 21438-3:2010 PDF

Scope: This part of ISO 21438 specifies a method for the determination of the time-weighted average mass concentration of soluble particulate fluorides and hydrofluoric acid (HF) in workplace air by collection of the particulate fluorides on a pre-filter and HF on an alkali-impregnated filter and analysis by ion chromatography. The method is only applicable to determination of particulate fluorides that are soluble using the sample preparation procedure specified. For aerosol 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 method is applicable to the determination of masses of 0,005 mg to at least 1,25 mg of particulate fluorides per sample and 0,012 5 mg to at least 1,2 mg of HF per sample. The concentration range of particulate fluorides and HF in air for which the measuring procedure is applicable is determined by the sampling method selected by the user. For a 120 l air sample, the working range is approximately 0,04 mg m?3 to at least 10 mg m?3 for particulate fluorides and approximately 0,13 mg m?3 to at least 10 mg m?3 for HF. HF can react with co-sampled particulate matter on the pre-filter, causing an interference on the measured concentration.

ISO 21438-3:2010 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 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

2010 ISO 21438-3:2010 Workplace atmospheres - Determination of inorganic acids by ion chromatography - Part 3: Hydrofluoric acid and particulate fluorides