ISO/DIS 21438-3

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ISO/DIS 21438-3 is a draft international standard focused on determining the time-weighted average mass concentration of soluble particulate fluorides and hydrofluoric acid (HF) in workplace air. It outlines a method using ion chromatography after collecting the fluorides and HF on specific filters. This standard is part of the ISO 21438 series, which deals with workplace atmosphere analysi