ASTM_D_3986_-_17.pdf

Designation:D398617Standard Test Method forBarium in Brines,Seawater,and Brackish Water by Direct-Current Argon Plasma Atomic Emission Spectroscopy1This standard is issued under the fixed designation D3986;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 barium in brines,seawater,and brackishwaters by direct-current argon plasma atomic emission spec-troscopy(DCPAES).1.2 This test method has been tested in the range from 10mg/L to 20 mg/L.Samples shall be diluted to contain concen-trations within the calibration range(see 11.1 and 12.5).Higherconcentrations can also be determined by changing to a lesssensitive emission line.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.1.5 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 WaterD3352 Test Method for Strontium Ion in Brackish Water,Seawater,and BrinesD3370 Practices for Sampling Water from Closed ConduitsD4841 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 AnalysisE1097 Guide for Determination of Various Elements byDirect Current Plasma Atomic Emission Spectrometry3.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 continuing calibration blank,na solution containingno analytes(of interest)which is used to verify blank responseand freedom from carryover.3.2.2 continuing calibration verification,na solution(orset of solutions)of known concentration used to verify freedomfrom excessive instrumental drift;the concentration is to coverthe range of calibration curve.3.2.3 laboratory control sample,na solution with a certi-fied concentration of barium.3.2.4 total recoverable barium,na descriptive term relat-ing to the forms of barium recovered in the acid-digestionprocedure specified in this test method.4.Summary of Test Method4.1 This test method is dependent upon excitation of thebarium atom by a direct-current plasma source.When theexcited barium atom decays to a lower energy state it emitsenergy of a wavelength characteristic to the barium atom.Theintensity of this emitted radiation will increase in directproportion to the concentration of barium in the sample,whenworking in the linear response range.4.2 Since the variable and often high concentration ofmatrix materials in brines,seawater,and brackish water affectemission differently,it is a difficult task to prepare standardssufficiently similar to the samples.To overcome this problem,the standards are buffered with lithium ion and the samples arediluted and buffered in the same manner.The standards areused to construct a calibration curve and the concentration of1This 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 June 1,2017.Published June 2017.Originallyapproved in 1981.Last previous edition approved in 2011 as D3986 11.DOI:10.1520/D3986-17.2For 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 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 the samples are calculated from this curve.Alternatively,theinstrument may be calib