ASTM_D_1687_-_12.pdf

Designation:D168712Standard Test Methods forChromium in Water1This standard is issued under the fixed designation D1687;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.This standard has been approved for use by agencies of the Department of Defense.1.Scope*1.1 These test methods cover the determination of hexava-lent and total chromium in water.Three test methods areincluded as follows:Test MethodConcentrationRangeSectionsAPhotometric Diphenyl-carbohydrazide0.01 to 0.5mg/L7-15BAtomicAbsorption,Direct0.1 to 10mg/L16-24CAtomic Absorption,Graphite Furnace5 to 100g/L25-331.2 Test Method A is a photometric method that measuresdissolved hexavalent chromium only.Test Methods B and Care atomic absorption methods that are generally applicable tothe determination of dissolved or total recoverable chromiumin water without regard to valence state.1.3 Test Method A has been used successfully with reagentgrade water Types I,II,and III,tap water,10%NaCl solution,treated water from a synthetic organic industrial plant thatmeets National Pollution Discharge Elimination System(NPDES)permit requirements,and EPA-extraction procedureleachate water,process water,lake water,effluent treatment,that is,lime neutralization and precipitation of spent pickleliquor and associated rinse water from stainless steel pickling.Test Method C has been used successfully with reagent water,stock scrubber water,lake water,filtered tap water,river water,well water,production plant water,and a condensate from amedium BTU coal gasification process.Matrices used,exceptfor reagent water,are not available for Test Method B.It is theusers responsibility to ensure the validity of these test methodsfor waters of untested matrices.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are mathematical conversions and may not beexact equivalents;therefore,each system shall be used inde-pendently of the other.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.For specific hazardstatements,see 4.2 and Note 6 and Note 7.2.Referenced Documents2.1 ASTM Standards:2D858 Test Methods for Manganese in WaterD1066 Practice for Sampling SteamD1068 Test Methods for Iron in WaterD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1688 Test Methods for Copper in WaterD1691 Test Methods for Zinc in WaterD1886 Test Methods for Nickel in WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD3557 Test Methods for Cadmium in WaterD3558 Test Methods for Cobalt in WaterD3559 Test Methods for Lead in WaterD3919 Practice for Measuring Trace Elements in Water byGraphite Furnace Atomic Absorption SpectrophotometryD4691 Practice for Measuring Elements in Water by FlameAtomic Absorption SpectrophotometryD4841 Practice for Estimation of Holding Time for WaterSamples Containing Organic and Inorganic ConstituentsD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water AnalysisE60 Practice for Analysis of Metals,Ores,and RelatedMaterials by SpectrophotometryE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible Spectrophotometers1These test methods are under the jurisdiction of ASTM Committee D19 onWater and are the direct responsibility of Subcommittee D19.05 on InorganicConstituents in Water.Current edition approved Sept.1,2012.Published August 2007.Originallyapproved in 1959.Last previous edition approved in 2007 as D1687 02(2007)E01.DOI:10.1520/D1687-12.2For 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.*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 States1 3.Terminology3.1 DefinitionsFor definitions of terms used in these testmethods,refer to Terminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 Laboratory Control Sample,na solution with thecertified concentration(s)of the analytes.4.Significance and Use4.1 Hexavalent chromium salts are used extensively inmetal finishing and plating applications,in anodizingaluminum,and in the manufacture of paints,dyes,explosives,and ceramics.Trivalent