1、Designation:D142615Standard 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 indicat
2、es 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.1.Scope*1.1 These test methods cover the determination of ammonianitrogen,exclusive of organic
3、 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
4、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 p
5、artici-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 amm
6、onia.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 app
7、ro-priate safety and health practices and determine the applica-bility 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.2.Referenced Documents
8、2.1 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 Closed ConduitsD5810 Guide fo
9、r 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 Spectr
10、ophotometers2.2 APHA Standard:3Standard Methods for the Examination of Water and WasteWater3.Terminology3.1 DefinitionsFor definitions of terms used in these testmethods,refer to Terminology D1129.4.Significance and Use4.1 Nitrogen is a nutrient in the environment and is neces-sary to sustain growth
11、 of most organisms.It exists in severalforms 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 i
12、onized 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 extent ofdissociation.4Ammonia may occur in water as a product of1These test methods are under the jurisdiction o
13、f ASTM Committee D19 onWater and are the direct responsibility of Subcommittee D19.05 on InorganicConstituents in Water.Current edition approved March 15,2015.Published April 2015.Originallyapproved in 1956.Last previous edition approved in 2008 as D1426 08.DOI:10.1520/D1426-15.2For referenced ASTM
14、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:/
15、www.apha.org.4Quality Criteria for Water,USEPA-440/9-76-023,July 26,1976,pp.1624.*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 anaerobic decomposition of nitrogen containi
16、ng compounds orfrom waste streams containing ammonia.5.Purity of Reagents5.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shallconform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,where suchspecifications are available.5Other grades may be used,pro-vided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe dete
