BS ISO 21438-2:2009
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Workplace atmospheres. Determination of inorganic acids by ion chromatography Volatile acids, except hydrofluoric acid (hydrochloric acid, hydrobromic acid and nitric acid)
Hardcopy , PDF
29-01-2024
English
31-01-2010
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Requirement
6 Reagents
7 Apparatus
8 Occupational exposure assessment
9 Sampling
10 Analysis
11 Expression of results
12 Method performance
13 Test report
Annex A (informative) - Temperature and pressure correction
Annex B (normative) - Filter materials
Bibliography
Describes 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 (HNO[3]) vapour and mist in workplace air by collection on an alkali-impregnated quartz fibre filter and analysis by ion chromatography.
| Committee |
EH/2/2
|
| DocumentType |
Standard
|
| Pages |
40
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
This part of ISO21438 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 ISO7708, and to static (area) sampling.
The analytical method is applicable to the determination of masses of 0,01mg to 2,5mg 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 240l air sample, the working range is approximately 0,04mg·m−3 to 10mg·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.
| Standards | Relationship |
| ISO 21438-2:2009 | Identical |
| ASTM E 1370 : 2014 : REDLINE | Standard Guide for Air Sampling Strategies for Worker and Workplace Protection |
| EN 12919:1999 | Workplace atmospheres - Pumps for the sampling of chemical agents with a volume flow rate of over 5 l/min - Requirements and test methods |
| ASTM D 4840 : 1999 | Standard Guide for Sampling Chain-of-Custody Procedures |
| ISO 7708:1995 | Air quality — Particle size fraction definitions for health-related sampling |
| ISO 8655-1:2002 | Piston-operated volumetric apparatus Part 1: Terminology, general requirements and user recommendations |
| ISO 3585:1998 | Borosilicate glass 3.3 — Properties |
| ISO 8756:1994 | Air quality Handling of temperature, pressure and humidity data |
| ISO 1042:1998 | Laboratory glassware — One-mark volumetric flasks |
| ISO 648:2008 | Laboratory glassware — Single-volume pipettes |
| EN 482:2012+A1:2015 | Workplace exposure - General requirements for the performance of procedures for the measurement of chemical agents |
| ISO 21438-3:2010 | Workplace atmospheres — Determination of inorganic acids by ion chromatography — Part 3: Hydrofluoric acid and particulate fluorides |
| ISO/IEC Guide 99:2007 | International vocabulary of metrology Basic and general concepts and associated terms (VIM) |
| CEN/TR 15230:2005 | Workplace atmospheres - Guidance for sampling of inhalable, thoracic and respirable aerosol fractions |
| ISO 8655-2:2002 | Piston-operated volumetric apparatus Part 2: Piston pipettes |
| EN 13205:2001 | Workplace atmospheres - Assessment of performance of instruments for measurement of airborne particle concentrations |
| EN 1540:2011 | Workplace exposure - Terminology |
| EN 1232:1997 | Workplace atmospheres - Pumps for personal sampling of chemical agents - Requirements and test methods |
| ISO 8655-6:2002 | Piston-operated volumetric apparatus Part 6: Gravimetric methods for the determination of measurement error |
| ISO/IEC Guide 98-3:2008 | Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) |
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