1、Designation:D451910Standard Test Method forOn-Line Determination of Anions and Carbon Dioxide inHigh Purity Water by Cation Exchange and Degassed CationConductivity1This standard is issued under the fixed designation D4519;the number immediately following the designation indicates the year oforigina
2、l 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.1.Scope1.1 This on-line test method includes hydrogen exchangeand degassing by boili
3、ng and provides means for determininganions(such as Cl,SO4,NO3,and F)at levels as low as2 g/L(2 ppb)and carbon dioxide at the level of 0.01 to 10mg/L(ppm)at 25C in high purity water and steam condensateby measuring electrical conductivity.1.2 The conductivity of all anions(except OH)is deter-mined a
4、nd not the conductivity of an individual anion if morethan one is present.If only one anion is present(such as Clor SO4),reference to Table 1 and Table 2 or Figs.1-3provides the chloride or sulfate and CO2concentration.1.3 This test method has been improved in accuracy byusing a modern microprocesso
5、r instrument for conductivityand temperature measurement and appropriate temperaturecompensation algorithms for compensation to 25C.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;there
6、fore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 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
7、establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1066 Practice for Sampling SteamD1125 Test Methods for Electrical Conductivity and Resis-tivity of WaterD1129 Terminology Relating to
8、WaterD1192 Guide for Equipment for Sampling Water and Steamin Closed Conduits(Withdrawn 2003)3D1193 Specification for Reagent WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370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 Conduits3.Termin
9、ology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Test Methods D1125 and Terminology D1129.4.Summary of Test Method4.1 This test method measures the anion concentration(suchas Cland SO4)by measuring the electrical conductivity ofthe anions after passing cooled condensate
10、or high purity waterthrough a cation exchanger in the hydrogen form,then throughan electric reboiler.Passage through the cation resin replacescations(including ammonia and amines)in the water withhydrogen ions.This eliminates interference in the measure-ment of anions.Three conductivity cells locate
11、d in the instru-ment provide measurements of the influent conductivity,cationconductivity at the incoming sample temperature,and theeffluent conductivity at atmospheric boiling water temperatureafter acidic(volatile)gas removal.Conductivity values are1This test method is under the jurisdiction of AS
12、TM Committee D19 on Waterand is the direct 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 Water.Current edition approved Dec.1,2010.Published March 2011.Originallyappro
13、ved in 1985.Last previous edition approved in 2005 as D4519 94(2005).DOI:10.1520/D4519-10.2For 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
14、page onthe ASTM website.3The 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 States1 then corrected to 25C.While the influent conductivity mea-surement is not necessar
15、y in determining the total anionconductivity,its determination provides a more completeevaluation of the sample,which can also include an estimationof the amine content.Measurement of the cation and reboileffluent conductivities are necessary in determining the com-position of the influent(total ani
16、ons and acidic gas content).Reference to Table 1 and Table 2 or Figs.1-3,or both,are thennecessary to complete the determinations.4.2 In-depth studies provide additional background andupdated experience with the degassed cation conductivitytechnique.45.Significance and Use5.1 This test method can be a useful diagnostic tool inmeasuring the impurities and detecting their sources in highpurity water,the steam condensate of high pressure powerplants,and in the process water of certain industries re
