ASTM_D_4193_-_08_2013e1.pdf

Designation:D419308(Reapproved 2013)1Standard Test Method forThiocyanate in Water1This standard is issued under the fixed designation D4193;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 June 2013.1.Scope1.1 This test method covers the quantitative colorimetriclaboratory measurement of dissolved thiocyanate in water,waste water,and saline water in the range from 0.1 to 2.0 mg/L.For higher concentrations,use an aliquot from the dilutedsample.1.1.1 ValidationThis test method was validated over therange of 0.07 to 1.42 mg/L.This test method was validated atnine laboratories at four levels.This test method may be validfor reporting results down to lower levels as validated inindividual user laboratories.1.1.2 ApplicationThis test method has been validated inreagent water,Type II,in multiple laboratories and 7 naturalwaters,1 laboratory effluent,1 steel mill effluent,and 2dechlorinated and treated sanitary effluents in single laborato-ries.It is the users responsibility to assure the validity of thetest method on any untested matrices.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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.For specific hazardstatements,see Section 9.2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD1192 Guide for Equipment for Sampling Water and Steamin Closed Conduits(Withdrawn 2003)3D1193 Specification for Reagent WaterD2036 Test Methods for Cyanides in WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test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of WaterD4210 Practice for Intralaboratory Quality Control Proce-dures and a Discussion on Reporting Low-Level Data(Withdrawn 2002)3D4841 Practice for Estimation of Holding Time for WaterSamples Containing Organic and Inorganic ConstituentsD5788 Guide for Spiking Organics into Aqueous SamplesD5789 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Organic Constituents(Withdrawn 2002)3D5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water AnalysisD7237 Test Method for Free Cyanide with Flow InjectionAnalysis(FIA)Utilizing Gas Diffusion Separation andAmperometric DetectionD7365 Practice for Sampling,Preservation and MitigatingInterferences in Water Samples for Analysis of CyanideE60 Practice for Analysis of Metals,Ores,and RelatedMaterials by SpectrophotometryE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible Spectrophotometers3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D1129.4.Summary of Test Method4.1 This test method consists of thiocyanate reacting withferric ions at a pH of 2 to form a colored complex which isdetermined colorimetrically at 460 nm and adheres to BeersLaw.1This 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 June 1,2013.Published July 2013.Originally approvedin 1982.Last previous edition approved in 2008 as D4193 08.DOI:10.1520/D4193-08R13E01.2For 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 States1 4.2 Industrial wastes may be highly colored and containvarious interfering organic compounds which must be removedby adsorption on macroreticular resin4prior to analysis.5.Significance and Use5.1 This test method is useful for analysis of many naturalwaters that contain thiocyanate from organic decompositionproducts and waste water discharges.Some industrial wastes,such as those from the metallurgical processing of gold ores,steel industry,petroleum refining,and coal gasification,maycontain significant concentrations of thiocyanate.Thiocyanateper se is not recognized as a toxic chemical compound.However,when chlorinated,thiocyanate is converted to thehighly toxic and volatile cyanogen chloride at high