ASTM_D_7511_-_12_2017e1.pdf

Designation:D751112(Reapproved 2017)1Standard Test Method forTotal Cyanide by Segmented Flow Injection Analysis,In-LineUltraviolet Digestion and Amperometric Detection1This standard is issued under the fixed designation D7511;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.1NOTEWarning notes were editorially updated throughout in July 2017.1.Scope1.1 This test method is used for determining total cyanide indrinking and surface waters,as well as domestic and industrialwastes.Cyanide ion(CN),hydrogen cyanide in water(HCN(aq),and the cyano-complexes of zinc,copper,cadmium,mercury,nickel,silver,and iron may be determinedby this test method.Cyanide ions from Au(I),Co(III),Pd(II),and Ru(II)complexes are only partially determined.1.2 The method detection limit(MDL)is 1.0 g/L cyanideand the minimum level(ML)is 3 g/L.The applicable range ofthe method is 3 to 500 g/L cyanide using a 200-L sampleloop.Extend the range to analyze higher concentrations bysample dilution or changing the sample loop volume.1.3 This test method can be used by analysts experiencedwith equipment using segmented flow analysis(SFA)and flowinjection analysis(FIA)or working under the close supervisionof such qualified persons.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.Specific hazardstatements are given in 8.5 and Section 9.1.6 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:2D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD2036 Test Methods for Cyanides in WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD3856 Guide for Management Systems in LaboratoriesEngaged in Analysis of WaterD4210 Practice for Intralaboratory Quality Control Proce-dures and a Discussion on Reporting Low-Level Data(Withdrawn 2002)3D5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water AnalysisD6696 Guide for Understanding Cyanide SpeciesD7365 Practice for Sampling,Preservation and MitigatingInterferences in Water Samples for Analysis of Cyanide3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129 and Guide D6696.3.2 Definitions of Terms Specific to This Standard:3.2.1 total cyanide,nrefers to all cyanide-containing com-pounds in a sample,including free cyanide,WAD cyanidecompounds,and strong metal cyanide complexes.4.Summary of Test Method4.1 Prior to analysis,treat the sample to remove potentialinterferences(Sections 4 and 8).Ultraviolet(UV)digestionreleases cyanide from cyanide complexes.Acid addition con-verts cyanide ion to hydrogen cyanide gas(HCN),whichpasses under a gas diffusion membrane.The hydrogen cyanide1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.06 on Methods forAnalysis forOrganic Substances in Water.Current edition approved July 1,2017.Published July 2017.Originally approvedin 2009.Last previous edition approved in 2012 as D7511 12.DOI:10.1520/D7511-12R17E01.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright 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 gas diffuses through the membrane into an alkaline receivingsolution,where it converts back to cyanide ion.A silverworking electrode,silver/silver chloride reference electrode,and platinum/stainless steel counter electrode at an appliedpotential of zero volt amperometri