ASTM_D_3920_-_18.pdf

Designation:D392018Standard Test Method forStrontium in Water1This standard is issued under the fixed designation D3920;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 This test method covers the determination of dissolvedand total recoverable strontium in water and wastewater byatomic absorption spectroscopy.1.2 The test method is applicable in the range from 0.1 to 1mg/L of strontium.The range may be extended by dilution ofthe original sample.1.3 Round-robin data were obtained in natural and reagentwater matrices.It is the users responsibility to ensure thevalidity of the test method for waters of untested matrices.1.4 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.1.5 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautionary statements are given in 8.4 and 8.9.1.6 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 WaterD1976 Test Method for Elements in Water by Inductively-Coupled Argon Plasma Atomic Emission SpectroscopyD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD4691 Practice for Measuring Elements in Water by FlameAtomic Absorption SpectrophotometryD4841 Practice for Estimation of Holding Time for WaterSamples Containing Organic and Inorganic ConstituentsD5673 Test Method for Elements in Water by InductivelyCoupled PlasmaMass SpectrometryD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analysis3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 total recoverable strontium,na descriptive termrelating to the forms of strontium that are determinable by thedigestion procedure described in this test method.3.2.2 laboratory control sample,na solution with a certi-fied concentration of the strontium.4.Summary of Test Method4.1 Strontium is determined by atomic absorption spectro-photometry.The sample is aspirated into an air-acetylene flamefollowing the addition of lanthanum chloride/potassium chlo-ride solution.Samples containing particulate matter that mayclog the aspirator capillary or burner,thus producing inaccurateresults,are filtered through a 0.45-m membrane filter prior totesting.5.Significance and Use5.1 Although most potable supplies contain little strontium,some well waters in the midwestern part of the United Stateshave levels as high as 39 mg/L.35.2 This test method affords a reliable means of accuratelydetermining strontium and correcting calcium results obtainedby the methods cited in 6.2.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.05 on Inorganic Constituentsin Water.Current edition approved Feb.1,2018.Published May 2018.Originallyapproved in 1980.Last previous edition approved in 2012 as D3920 12.DOI:10.1520/D3920-18.2For 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.3Standard Method for the Examination of Water and Wastewater,14th Ed.American Public Health Assn.,Washington,DC 20005.*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 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 5.3 ICP-MS or ICP-AES may also be appropriate but at ahigher instrument cost.See Test Methods D1976 and D5673.6.Interference