ASTM_D_5257_-_17.pdf

Designation:D525717Standard Test Method forDissolved Hexavalent Chromium in Water by IonChromatography1This standard is issued under the fixed designation D5257;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.1.Scope*1.1 This test method covers procedures for the determina-tion of dissolved hexavalent chromium in wastewater,surfacewater,and drinking water.1.2 The precision and bias of this test method has beentested in reagent water and industrial wastewater and has beenfound suitable over the range of approximately 1 to 1000 g/L.Higher levels can be determined by appropriate dilution.1.3 Samples containing very high levels of anionic species(that is,chloride,sulfate,etc.)may cause column overload.Samples containing high levels of reducing species(that is,sulfides,sulfites,etc.)may cause reduction of Cr(VI)to Cr(III).This can be minimized by buffering the sample to a pH of 9 to9.5,filtering it,storing it at 6C.A holding time of 28 daysmay be used if the user can demonstrate that such holding timedoes not affect sample integrity in accordance with U.S.EPA40 CFR 136,Part II.1.4 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.5 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analysis2.2 U.S.EPA Standards:3U.S.EPA 40 CFR 136 Guidelines Establishing Test Proce-dures for the Analysis of PollutantsU.S.EPA Method 218.6 Determination of DissolvedHexavalent Chromium in Drinking Water,Groundwaterand Industrial Wastewater Effluents by Ion Chromatogra-phy3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 continuing calibration blank,na solution containingno analytes(of interest)which is used to verify blank responseand freedom from carryover.3.2.2 continuing calibration verification,na solution(orset of solutions)of known concentration used to verify freedomfrom excessive instrumental drift;the concentration is to coverthe range of calibration curve.3.2.3 eluent,nthe ionic mobile phase used to transport thesample through the ion-exchange column.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.05 on Inorganic Constituentsin Water.Current edition approved Dec.1,2017.Published December 2017.Originallyapproved in 1992.Last previous edition approved in 2011 as D5257 11.DOI:10.1520/D5257-17.2For 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 U.S.Government Printing Office,Superintendent ofDocuments,732 N.Capitol St.,NW,Washington,DC 20401-0001,http:/www.access.gpo.gov.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.2.4 resolution,nthe ability of a column to separateconstituents under specified test conditions.3.2.5 total recoverable chromium,na descriptive termrelating to the forms of chromium recovered in the acid-digestion procedure specified in this test standard.4.Summary of Test Method4.1 Afixed volume of buffer