ASTM_D_1971_-_16_2021e1.pdf

Designation:D197116(Reapproved 2021)1Standard Practices forDigestion of Water Samples for Determination of Metals byFlame Atomic Absorption,Graphite Furnace AtomicAbsorption,Plasma Emission Spectroscopy,or PlasmaMass Spectrometry1This standard is issued under the fixed designation D1971;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.1NOTEThe WTO caveat was editorially added in November 2021.1.Scope1.1 Mostatomicabsorptionandplasmaemissionspectroscopy,and plasma-mass spectrometric test methodsrequire that the metals of interest be dissolved in a liquid phasebefore being introduced into the spectrophotometer.Thesepractices describe digestion or dissolution procedures wherebyanalyte metals associated with the solid fraction of a samplecan be brought into solution for subsequent analysis.Thefollowing practices are included:SectionsPractice ADigestion with Mineral Acids andElevated Pressure8 through 13Practice BDigestion with Mineral Acids andHeating at Atmospheric Pressure14 through 19Practice CIn-Bottle Digestion with Mineral Acids20 through 251.2 These practices have been demonstrated to be applicableto a wide variety of sample types and sample matrices,and inmany cases,will give complete dissolution of the analytemetals of interest.They are by no means the only digestionprocedures available.1.3 The user of these practices should be cautioned thatthese practices may not completely dissolve all portions of asamples solid phase and may not give complete recovery ofthe desired analyte metals.In these cases,other digestiontechniques are available that will effect complete dissolution ofa sample.It is the users responsibility to ensure the validity ofthese practices for use on their particular sample matrix,fortheir metals of interest.1.4 This practice assumes that the criteria established inGuide D3856 can be met.1.5 These digestion procedures have been selected for theirwide application,low cost,and ease of use.1.6 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are mathematicalconversion to inch-pound units that are provided for informa-tion only and are not considered standard.1.7 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 hazard statements are given in Section 6.1.8 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:2D511 Test Methods for Calcium and Magnesium In WaterD857 Test Method for Aluminum in WaterD858 Test Methods for Manganese in WaterD1068 Test Methods for Iron in WaterD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1687 Test Methods for Chromium in WaterD1688 Test Methods for Copper in WaterD1691 Test Methods for Zinc in WaterD1886 Test Methods for Nickel in WaterD1976 Test Method for Elements in Water by Inductively-Coupled Plasma Atomic Emission SpectroscopyD2972 Test Methods for Arsenic in WaterD3082 Test Method for Boron in Water1These practices are under the jurisdiction of ASTM Committee D19 on Waterand are the direct responsibility of Subcommittee D19.05 on Inorganic Constituentsin Water.Current edition approved Nov.1,2021.Published December 2021.Originallyapproved in 1991.Last previous edition approved in 2016 as D1971 16.DOI:10.1520/D1971-16R21E01.2For 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.Copyright 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?D3370 Practices for Sampling Water from Flowing ProcessStreamsD3372 Test Method for Molybdenum in WaterD3373 Test Method for Vanadium in WaterD3557 Test Methods for Cadmium in WaterD3558 Test Methods for Cobalt in WaterD3559 Test Methods for Lead in WaterD3645 Test Methods for Beryllium in WaterD3697 Test Method for Antimony in WaterD