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Significance and Use
Exposure to inorganic acids in workplace air can cause irritations of the skin, eyes and respiratory tract, and exposure limits for hydrochloric acid, hydrobromic acid and nitric acid in air have been established to reduce exposure risks to potentially affected workers (1). Sampling and analytical methods for volatile inorganic acids are needed for exposure assessment and risk reduction purposes.
1.1 This test method is intended for use in the determination of the time-weighted average mass concentration of hydrogen chloride gas and hydrochloric acid mist, hydrogen bromide vapor and hydrobromic acid mist, and nitric acid vapor and mist in workplace air. The samples are collected on an alkali-impregnated quartz fiber filter and analyzed by ion chromatography. The method is also appropriate for measuring short term exposures.
1.2 This test method assumes that air samples are collected using appropriate and applicable ASTM International standards for sampling of workplace air.
1.3 The procedure is targeted for occupational and environmental hygiene monitoring purposes.
1.4 No detailed operating instructions are provided because of differences among various makes and models of suitable instruments. Instead, the analyst shall follow the instructions provided by the manufacturer of the particular instrument. This standard does not address comparative accuracy of different devices or the precision between instruments of the same make and model.
1.5 The values stated in SI units are to be regarded as the standard.
1.6 The practice contains notes, which are explanatory and not part of mandatory requirements of the standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D882 Test Method for Tensile Properties of Thin Plastic Sheeting
D1193 Specification for Reagent Water
D4840 Guide for Sample Chain-of-Custody Procedures
D5337 Practice for Flow Rate Adjustment of Personal Sampling Pumps
D7035 Test Method for Determination of Metals and Metalloids in Airborne Particulate Matter by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)
E1370 Guide for Air Sampling Strategies for Worker and Workplace Protection
ICS Number Code 13.040.30 (Workplace atmospheres)
UNSPSC Code 40161505(Air filters)
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ASTM D7773-12, Standard Test Method for Determination of Volatile Inorganic Acids (HCl, HBr, and HNO