ASTM_D_2972_-_15.pdf

Designation:D297215Standard Test Methods forArsenic in Water1This standard is issued under the fixed designation D2972;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 These test methods2cover the photometric and atomicabsorption determination of arsenic in most waters and waste-waters.Three test methods are given as follows:ConcentrationRangeSectionsTest Method ASilver Diethyldithio-carbamate Colorimetric5 to 250 g/L7 to 16Test Method BAtomic Absorption,Hydride Generation1 to 20 g/L17 to 26Test Method CAtomic Absorption,Graphite Furnace5 to 100 g/L27 to 361.2 The analyst should direct attention to the precision andbias statements for each test method.It is the users responsi-bility to ensure the validity of these test methods for waters ofuntested matrices.1.3 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.1.4 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 11.1 and 20.2.2.Referenced Documents2.1 ASTM Standards:3D1129 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 ConduitsD3919 Practice for Measuring Trace Elements in Water byGraphite Furnace Atomic Absorption SpectrophotometryD4841 Practice for Estimation of Holding Time for WaterSamples Containing Organic and Inorganic ConstituentsD5810 Guide for Spiking into Aqueous SamplesD5673 Test Method for Elements in Water by InductivelyCoupled PlasmaMass SpectrometryD5847 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 Spectrophotometers3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in these test methods,refer to Terminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 total recoverable arsenic,na descriptive term relat-ing to the arsenic forms recovered in the acid-digestionprocedure specified in these test methods.3.2.1.1 DiscussionSome organic-arsenic compounds,such as phenylarsonic acid,disodium methane arsonate,anddimethylarsonic acid,are not recovered completely during thedigestion step.4.Significance and Use4.1 Herbicides,insecticides,and many industrial effluentscontain arsenic and are potential sources of water pollution.Arsenic is significant because of its adverse physiologicaleffects on humans.5.Purity of Reagents5.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shallconform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,where such1These 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 Feb.1,2015.Published March 2015.Originallyapproved in 1993.Last previous edition approved in 2008 as D2972 08.DOI:10.1520/D2972-15.2Similar to that appearing in Standard Methods for the Examination of Waterand Wastewater,12th edition,APHA,Inc.,New York,NY,1965;and identical withthat in Brown,E.,Skougstad,M.W.,and Fishman,M.J.,“Methods for Collectionand Analysis of Water Samples for Dissolved Minerals and Gases,”Techniques ofWater-Resources Investigations of the U.S.Geological Survey,Book 5,1970,p.46.3For 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 specifications are available.4Other grades may be used,pro-vided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Specification D1193,Type I.Other reagent water types maybe used provided it is first ascertained that the water is ofsufficient