ASTM_D_3352_-_15.pdf

Designation:D335215Standard Test Method forStrontium Ion in Brackish Water,Seawater,and Brines1This standard is issued under the fixed designation D3352;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 solublestrontium ion in brackish water,seawater,and brines by atomicabsorption spectrophotometry.1.2 Samples containing from 5 to 2100 mg/L of strontiummay be analyzed by this test method.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.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 ConduitsD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analysis3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D1129.4.Summary of Test Method4.1 This test method is dependent on the fact that metallicelements,in the ground state,will absorb light of the samewavelength they emit when excited.When radiation from agiven excited element is passed through a flame containingground state atoms of that element,the intensity of thetransmitted radiation will decrease in proportion to the amountof the ground state element in the flame.A hollow cathodelamp whose cathode is made of the element to be determinedprovides the radiation.The metal atoms3to be measured areplaced in the beam of radiation by aspirating the specimen intoan oxidant-fuel flame.A monochromator isolates the charac-teristic radiation from the hollow cathode lamp and a photo-sensitive device measures the attenuated transmitted radiation.4.2 Since the variable and sometimes high concentrations ofmatrix materials in the waters and brines affect absorptiondifferently,it is difficult to prepare standards sufficiently similarto the waters and brines.To overcome this difficulty,themethod of additions is used in which three identical samplesare prepared and varying amounts of a standard added to twoof them.The three samples are then aspirated,the concentra-tion readings recorded,and the original sample concentrationcalculated.5.Significance and Use5.1 This test method4can be used to determine strontiumions in brackish water,seawater,and brines.6.Interferences6.1 The chemical suppression caused by silicon,aluminum,and phosphate is controlled by adding lanthanum.The lantha-num also controls ionization interference.7.Apparatus7.1 Atomic Absorption SpectrophotometerThe instrumentshall consist of atomizer and burner,suitable pressure-regulating devices capable of maintaining constant oxidant and1This 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.1,2015.Published April 2015.Originallyapproved in 1974.Last previous edition approved in 2008 as D3352 08a.DOI:10.1520/D3352-15.2For 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.3For additional information on atomic absorption,see the following references:Angino,E.E.,and Billings,G.K.,Atomic Absorption Spectrophotometry inGeology,Elsevier Publishing Co.,New York,N.Y.,1967;Dean,J.A.,and Rains,T.C.,Editors,Flame Emission and Atomic Absorption Spectrometry Vol 1 Theory,Marcel Dekker,New York,NY,1969.4Additional information is contained in the following references:Fletcher,G.F.,and Collins,A.G.,“Atomic Absorption Methods of Analysis of Oilfield Brines:Barium,Calcium,Copper,Iron,Lead,Lithium,Magnesium,Manganese,Potassium,Sodium,Strontium,and Zinc,”U.S.Bureau of Mines,Report of Investigations 7861,1974,14 pp.;Collins,A.G.,Geochemistry of Oilfield Waters,Elsevier PublishingCo.,Amsterdam,Netherlands,1975.*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 fuel pressure for the duration of the test,a hollow cathode lampfor each