ASTM_D_3867_-_16_2021e1.pdf

Designation:D386716(Reapproved 2021)1Standard Test Methods forNitrite-Nitrate in Water1This standard is issued under the fixed designation D3867;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 and warning notes were editorially updated throughout in November2021.1.Scope1.1 These test methods cover the determination of nitritenitrogen,nitrate nitrogen,and combined nitrite-nitrate nitrogenin water and wastewater in the range from 0.05 to 1.0 mg/Lnitrogen.Two test methods2are given as follows:SectionsTest Method AAutomated Cadmium Reduction9 to 18Test Method BManual Cadmium Reduction19 to 281.2 These test methods are applicable to surface,saline,waste,and ground waters.It is the users responsibility toensure the validity of these test methods for waters of untestedmatrices.1.3 The values stated in either SI or inch-pound units are tobe regarded as the standard.No other units of measurement areincluded in this 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements,see 8.2.1.5 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:3D992 Method of Test for Nitrate Ion in Water(Withdrawn1983)4D1129 Terminology Relating to WaterD1141 Practice for Preparation of Substitute Ocean WaterD1193 Specification for Reagent WaterD1254 Method of Test for Nitrite Ion in Water(Withdrawn1980)4D2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Flowing ProcessStreamsD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water AnalysisD7781 Test Method for Nitrite-Nitrate in Water by NitrateReductaseE60 Practice for Analysis of Metals,Ores,and RelatedMaterials by SpectrophotometryE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible Spectrophotometers3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.4.Summary of Test Methods4.1 Total Oxidized NitrogenA filtered sample is passedthrough a column containing copper-coated cadmium granulesto reduce nitrate ion to nitrite ion.The combined nitrite-nitratenitrogen is determined by diazotizing the total nitrite ion with1These test methods are under the jurisdiction of ASTM Committee D19 onWater and are the responsibility of Subcommittee D19.05 on Inorganic Constituentsin Water.Current edition approved Nov.1,2021.Published December 2021.Originallyapproved in 1979.Last previous edition approved in 2016 as D3867 16.DOI:10.1520/D3867-16R21E01.2Methods similar to these appear in Methods of Chemical Analysis of Water andWastes,2nd edition,U.S.Environmental Protection Agency.3For 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.4The last approved version of this historical standard is referenced onwww.astm.org.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?sulfanilamideandcouplingwithN-(1-naphthyl)ethylenediamine dihydrochloride to form a highlycolored azo dye that is measured spectrophotometrically.4.2 NitriteThe nitrite ion originally present in the samplecan be determined separately by carrying out the procedure andomitting the cadmium reduction step.4.3 NitrateThe nitrate ion can be calculated as the differ-ence between the combined nitrite-nitrate nitrogen and thenitrite nitrogen.5.Significance and Use5.1 Both test methods use identical reagents and sampleprocessing.The only difference between the two methods isthat one test method is automated and the other is manual.Theranges and interferences are identical.5.2 The automated test method is