ASTM_D_1426_-_15_2021e1.pdf

Designation:D142615(Reapproved 2021)1Standard Test Methods forAmmonia Nitrogen In Water1This standard is issued under the fixed designation D1426;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1NOTEThe WTO caveat was editorially added in November 2021.1.Scope1.1 These test methods cover the determination of ammonianitrogen,exclusive of organic nitrogen,in water.Two testmethods are included as follows:SectionsTest Method ADirect Nesslerization7 16Test Method BIon Selective Electrode17 241.2 Test Method A is used for the routine determination ofammonia in steam condensates and demineralizer effluents.1.3 Test Method B is applicable to the determination ofammonia nitrogen in the range from 0.5 to 1000 mg NH3N/Ldirectly in reagent and effluent waters.Higher concentrationscan be determined following dilution.The reported lowerrange is based on multiple-operator precision.Lower limitshave been obtained by two of the twelve laboratories partici-pating in the round robin.1.4 Both test methods A and B are applicable to surface andindustrial waters and wastewaters following distillation.Thetest method for distillation given in Appendix X1 has beenused in the past to meet requirements for predistillation ofsamples being analyzed for ammonia.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 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.1.7 The distillation method now appears as Appendix X1and is provided as nonmandatory information only.The auto-mated colorimetric phenate method has been discontinued.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:2D1066 Practice for Sampling SteamD1129 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 Flowing ProcessStreamsD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water AnalysisE60 Practice for Analysis of Metals,Ores,and RelatedMaterials by SpectrophotometryE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible Spectrophotometers2.2 APHA Standard:3Standard Methods for the Examination of Water and WasteWater3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.4.Significance and Use4.1 Nitrogen is a nutrient in the environment and is neces-sary to sustain growth of most organisms.It exists in several1These test methods are under the jurisdiction of ASTM Committee D19 onWater and are the direct responsibility of Subcommittee D19.05 on InorganicConstituents in Water.Current edition approved Nov.1,2021.Published December 2021.Originallyapproved in 1956.Last previous edition approved in 2015 as D1426 15.DOI:10.1520/D1426-15R21E01.2For 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.3Available fromAmerican Public HealthAssociation,800 I St.NW,Washington,DC 20001,http:/www.apha.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?forms such as nitrate,nitrite,organic nitrogen such as proteinsor amino acids,and ammonia.4.2 Ammonia is a colorless,gaseous compound with a sharpdistinctive odor.It is highly soluble in water where it exists ina molecular form associated with water and in an ionized formas NH4+.The extent of association or ionization is dependenton the temperature and pH.It may also be toxic to aquatic life.The extent of toxicity is dependent upon species and ext