1、Designation:D138507(Reapproved 2013)1Standard Test Method forHydrazine in Water1This standard is issued under the fixed designation D1385;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 parenthes
2、es 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.1NOTEThis standard was reapproved with editorial changes in January 2013.1.Scope1.1
3、This test method covers2the colorimetric determinationof hydrazine in boiler feed waters,condensates,natural,andwell waters that have been treated with hydrazine(N2H4).Thistest method is usable in the range from 5.0 to 200 g/L(ppb)hydrazine.The range is for photometric measurements made at458 nm in
4、50 mm cell.Higher concentrations of hydrazine canalso be determined by taking a more diluted sample.1.2 It is the users responsibility to ensure the validity of thistest method for untested types of waters.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement
5、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 pr
6、ior to use.For specificprecautionary statements,see 5.3,Note 1,and Footnote 8.2.Referenced Documents2.1 ASTM Standards:3D1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD3370 Practices for Sampling Water from Closed ConduitsD5810 Guide for Spik
7、ing 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 Spectrophoto
8、meters3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D1129.4.Summary of Test Method4.1 When a solution of p-dimethylaminobenzaldehyde inmethyl alcohol and hydrochloric acid is added to hydrazine indiluted hydrochloric acid solution,a characteristic
9、yellow colorof p-dimethylaminobenzalazine is formed.The yellow colorformed is proportional to the hydrazine present and is in goodagreement with Beers law in the range from 5.0 to 200 g/L(ppb)hydrazine.5.Significance and Use5.1 Hydrazine is a man-made chemical and is not found innatural waters.The d
10、etermination of hydrazine is usually madeon boiler feedwaters,process waters,and other waters thathave been treated with hydrazine(N2H4)for the purpose ofmaintaining residuals to prevent corrosion by dissolved oxy-gen.This reducing chemical reacts with dissolved oxygen toform nitrogen and water.Howe
11、ver,under certain conditions itcan also decompose to form ammonia and nitrogen.Hydrazineis used extensively as a preboiler treatment chemical forhigh-pressure boilers to scavenge small amounts of dissolvedoxygen that are not removed by mechanical aeration.It has theadvantage over sulfite treatment i
12、n that it does not produce anydissolved solids in the boiler water.Hydrazine is often deter-mined in concentrations below 0.1 mg/L.However,in layupsolutions for the protection of idle boilers,hydrazine may bepresent in concentrations as high as 200 mg/L.1This test method is under the jurisdiction of
13、 ASTM Committee D19 on Waterand is the responsibility of Subcommittee D19.03 on Sampling Water andWater-Formed Deposits,Analysis of Water for Power Generation and Process Use,On-Line Water Analysis,and Surveillance of WaterCurrent edition approved Jan.1,2013.Published February 2013.Originallyapprove
14、d in 1967.Last previous edition approved in 2007 as D1385 07.DOI:10.1520/D1385-07R13E01.2For further information on this test method,the following references may be ofinterest:Watt,G.W.,and Chrisp,J.D.,“Spectrophotometric Method for theDetermination of Hydrazine,”Analytical Chemistry,Vol 24,No.12,19
15、52,pp.20062008,and Wood,P.R.,“Determination of Maleic Hydrazide Residues in Plantand Animal Tissue,”Analytical Chemistry,Vol 25,No.12,1953,pp.18791883.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandard
16、s 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 States1 5.2 Additionally,hydrazine provides protection where re-ducing conditions are required,particularly in mixed metal-lurgy systems for the protection of the copper alloys.5.3 Hydrazine is a suspected carcinogen and a thresholdlimit value in the atmosphere of 1.0 mg/L has been set byOSHA.When in an aqueous