ASTM_D_3866_-_12.pdf

Designation:D386612Standard Test Methods forSilver in Water1This standard is issued under the fixed designation D3866;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 methods cover the atomic absorption deter-mination of silver in water.Three test methods are given asfollows:ConcentrationRangeSectionsTest Method AAtomic Absorp-tionChelation-ExtractionA1 to 10 g/L7 to 15Test Method BAtomic Absorp-tionDirect0.1 to 10 mg/L16 to 24Test Method CAtomic Absorp-tionGraphite Furnace1 to 25 g/L25 to 33ASimilar to that in Brown,E.,Skougstad,M.W.,and Fishman,M.J.,“Methods forCollection and Analysis of Water Samples for Dissolved Minerals and Gases,”Techniques of Water-Resources Investigations of the U.S.Geological Survey,Book 5,Chapter A1,1970,p.46.1.2 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.1.3 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.Specific precau-tionary statements are given in Note 4,Note 6,Note 11,andNote 15.2.Referenced Documents2.1 ASTM Standards:2D1129 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 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 Analysis3.Terminology3.1 Definition of Term Specific to These Test Methods:3.1.1 laboratory control sample,na solution with a certi-fied concentration of silver.3.1.2 total recoverable silver,nan arbitrary analytical termrelating to forms of silver that are determinable by thedigestion method that is included in the procedures.3.2 DefinitionsFor definition of terms used in these testmethods,refer to Terminology D1129.4.Significance and Use4.1 The principal adverse effect of silver in the body iscosmetic.It causes argyria,a permanent,blue-gray discolor-ation of the skin,eyes,and mucous membranes.4.2 Relatively small quantities of silver are bactericidal orbacteriostatic and find limited use in both disinfection ofswimming pool waters and point-of-use water filters.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,when 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 Sept.1,2012.Published September 2012.Originallyapproved in 1979.Last previous edition approved in 2007 as D3866 07.DOI:10.1520/D386612.2For 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 specifications are available.3Other 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,II,or III water.Type I ispreferred and more commonly used.Other reagent water typesmay be used provided it is first ascertained that the water is ofsufficiently high purity to permit its use without adverselyaffecting the precision and bias of the test method.Type IIwater was specified at the time of round robin testing of thesetest methods.NOTE1The user must ensure the type of reagent water chosen issufficiently free of interferences.The water should be analyzed using thetest method.6.Sampling6.1 Collect the sample in accordan