1、Designation:D777312Standard Test Method forDetermination of Volatile Inorganic Acids(HCl,HBr,andHNO3)Using Filter Sampling and Suppressed IonChromatography1This standard is issued under the fixed designation D7773;the number immediately following the designation indicates the year oforiginal adoptio
2、n or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method is intended for use in the determinationof the time-weighted aver
3、age mass concentration of hydrogenchloride gas and hydrochloric acid mist,hydrogen bromidevapor and hydrobromic acid mist,and nitric acid vapor andmist in workplace air.The samples are collected on analkali-impregnated quartz fiber filter and analyzed by ionchromatography.The method is also appropri
4、ate for measuringshort term exposures.1.2 This test method assumes that air samples are collectedusing appropriate and applicableASTM International standardsfor sampling of workplace air.1.3 The procedure is targeted for occupational and environ-mental hygiene monitoring purposes.1.4 No detailed ope
5、rating instructions are provided becauseof differences among various makes and models of suitableinstruments.Instead,the analyst shall follow the instructionsprovided by the manufacturer of the particular instrument.Thisstandard does not address comparative accuracy of differentdevices or the precis
6、ion between instruments of the same makeand model.1.5 The values stated in SI units are to be regarded as thestandard.1.6 The practice contains notes,which are explanatory andnot part of mandatory requirements of the standard.1.7 This standard does not purport to address all of thesafety concerns,if
7、 any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D882 Test Method for Tensile Properties of Thin Pl
8、asticSheetingD1193 Specification for Reagent WaterD4840 Guide for Sample Chain-of-Custody ProceduresD5337 Practice for Flow Rate Adjustment of Personal Sam-pling PumpsD7035 Test Method for Determination of Metals and Met-alloids in Airborne Particulate Matter by InductivelyCoupled Plasma Atomic Emis
9、sion Spectrometry(ICP-AES)E1370 Guide for Air Sampling Strategies for Worker andWorkplace Protection2.2 ISO and European Standards:ISO 648 Laboratory glasswareOne mark pipettes3ISO 7708 Air qualityParticle size fraction definitions forhealth-related sampling3ISO 1042 Laboratory glasswareOne-mark vol
10、umetricflasks3EN 482 Workplace atmospheresGeneral requirements forthe performance of procedures for the measurement ofchemical agents4EN 1076 Workplace atmosphereProcedures for measuringgasesandvapoursusingpumpedsamplersRequirements and test methods43.Summary of Test Method3.1 A known volume of air
11、is drawn through a pre-filter andan alkali-impregnated quartz fiber filter,mounted in an inhal-able sampler,to collect HCl,HBr and HNO3.The acids arecollected on the impregnated quartz fiber filter,while particu-late salts of the acids are trapped on the pre-filter.1This test method is under the jur
12、isdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.04 on Workplace AirQuality.Current edition approved Jan.1,2012.Published February 2012.DOI:10.1520/D7773-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Se
13、rvice at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from European Committee for
14、 Standardization(CEN),AvenueMarnix 17,B-1000,Brussels,Belgium,http:/www.cen.eu.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2 The acids collected on the sampling filter are extractedwith water or eluent to solubilize the analytes of
15、interest.3.3 Aliquots of the sample solution are subjected to ionchromatography in order to separate the extracted chloride,nitrate or bromide from other anions.Following thisseparation,the anions are measured using a conductivity orUV-vis detector and analytical results are obtained by plottingthe
16、measured conductivity or absorbance as a function ofconcentration.3.4 The results can be used for assessment of occupationalexposure to HCl,HBr and HNO3in air.4.Significance and Use4.1 Exposure to inorganic acids in workplace air can causeirritations of the skin,eyes and respiratory tract,and exposurelimits for hydrochloric acid,hydrobromic acid and nitric acidin air have been established to reduce exposure risks topotentially affected workers(1).5Sampling and analyticalmethods for volatile inor