ASTM_D_6832_-_13e1.pdf

Designation:D6832131Standard Test Method forthe Determination of Hexavalent Chromium in Workplace Airby Ion Chromatography and SpectrophotometricMeasurement Using 1,5-diphenylcarbazide1This standard is issued under the fixed designation D6832;the number immediately following the designation indicates the year oforiginal adoption 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.1NOTEEditorial corrections were made in October 2013.1.Scope1.1 This test method specifies a method for the determina-tion of the time-weighted average mass concentration ofhexavalent chromium in workplace air samples.1.2 The method is applicable to the personal sampling of theinhalable fraction of airborne particles,as defined in ISO 7708,and to area(static)sampling.1.3 The sample dissolution procedure specifies separateprocedures for soluble and insoluble hexavalent chromium.1.4 The method is applicable to the determination of massesof 0.01 g to 10 g of hexavalent chromium per samplewithout dilution.1.5 The concentration range for hexavalent chromium in airfor which this procedure is applicable is approximately 0.1g/m3to 100 g/m3,assuming 1 m3of air sample.The rangecan be extended upwards by appropriate dilution.1.6 Interconversion of trivalent and hexavalent chromiumspecies may occur during sampling and sample preparation,but these processes are minimized to the extent possible by thesampling and sample preparation procedures employed.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.8 This standard does not purport to address all of thesafety concerns,if 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:2D1193 Specification for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD3195 Practice for Rotameter CalibrationD4840 Guide for Sample Chain-of-Custody ProceduresE882 Guide for Accountability and Quality Control in theChemical Analysis LaboratoryE1370 Guide for Air Sampling Strategies for Worker andWorkplace Protection2.2 ISO Standards:3ISO 648 Laboratory GlasswareOne-mark PipetsISO 1042 Laboratory GlasswareOne-mark VolumetricFlasksISO 3585 Glass Plant,Pipeline and FittingsProperties ofBorosilicate Glass 3.3ISO 7708 Air QualityParticle Size Definitions for Health-related SamplingISO 8655 Piston and/or Plunger-operated Volumetric Appa-ratus(6 Parts)3.Terminology3.1 For definitions of terms used in this standard testmethod,refer to Terminology D1356.4.Summary of Test Method4.1 A known volume of air is drawn through a filter tocollect particulate hexavalent chromium.The sampler is de-signed to collect the inhalable fraction of airborne particles(seeISO 7708).4.2 The filter and collected sample are subjected to adissolution procedure in order to extract hexavalent chromium.1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.04 on Workplace AirQuality.Current edition approved Oct.1,2013.Published October 2013.Originallyapproved in 2002.Last previous edition approved in 2008 as D6832 08.DOI:10.1520/D6832-13E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 The sample dissolution procedure may consist of one(or both)of two techniques:one for soluble and one for insolublehexavalent chromium.NOTE1If it is desired to measure both soluble as well as totalhexavalent chromium,the soluble procedure is used first,and this isfollowed by the procedure for insoluble hexavalent chromium com-pounds.Thus,total CrVI is the sum of soluble and insoluble hexavalentchromium compounds.On the other hand,if it is desired to measure totalhexavalent chromium without first isolating insoluble CrVI compounds,only the procedure for insoluble CrVI is required(this will dissolve bothsoluble and insoluble hexavalent chromium compounds).4.2.1 For dissolution of soluble hexavalent chromium,dis-tilled water with no heating is used to treat the sample.Alternatively,a weakly basic ammonium sulfate/ammoniumhydroxide buffer solution with no heating is used to extractsoluble forms of hexavalent chromium.4.2.2 For dissolution of insoluble hexavalent chromium,abasic carbonate buffer solution with heating by a hot plate isused for sample