1、Designation:D631715Standard Test Method forLow Level Determination of Total Carbon,Inorganic Carbonand Organic Carbon in Water by Ultraviolet,PersulfateOxidation,and Membrane Conductivity Detection1This standard is issued under the fixed designation D6317;the number immediately following the designa
2、tion 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.1.Scope1.1 This test method covers the determinatio
3、n of totalcarbon(TC),inorganic carbon(IC),and total organic carbon(TOC)in water in the range from 10 to 1000 g/L of carbon.This method is for laboratory or grab sample applications andhas been subjected to an interlaboratory study under theguidelines of D2777.Test Method D5997 can be used foron-line
4、 determinations.The test method utilizes persulfate orultraviolet oxidation of organic carbon,or both coupled with aCO2selective membrane to recover the CO2into deionizedwater.The change in conductivity of the deionized water ismeasured and related to carbon concentration in the oxidizedsample.Inorg
5、anic carbon is determined in a similar mannerwithout the oxidation step.In both cases,the sample isacidified to facilitate CO2recovery through the membrane.Therelationship between the conductivity measurement and carbonconcentration is described by a set of chemometric equationsfor the chemical equi
6、librium of CO2,HCO3,and H+,and therelationship between the ionic concentrations and the conduc-tivity.The chemometric model includes the temperature de-pendence of the equilibrium constants and the specific conduc-tances resulting in linear response of the method over the statedrange of TOC.See Test
7、 Method D4519 for a discussion of themeasurement of CO2by conductivity.1.2 This test method has the advantage of a very highsensitivity detector that allows very low detection levels onrelatively small volumes of sample.Also,use of two measure-ment channels allows determination of CO2in the samplein
8、dependently of organic carbon.Isolation of the conductivitydetector from the sample by the CO2selective membraneresults in a very stable calibration,with minimal interferences.1.3 This test method was used successfully with reagentwater spiked with various organic materials.It is the usersresponsibi
9、lity to ensure the validity of this test method forwaters of untested matrices.1.4 In addition to laboratory analyses,this test method maybe adapted to on line monitoring.See Test Method D5997.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included
10、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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.
11、Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to 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 o
12、n WaterD3370 Practices for Sampling Water from Closed ConduitsD4210 Practice for Intralaboratory Quality Control Proce-dures and a Discussion on Reporting Low-Level Data(Withdrawn 2002)3D5997 Test Method for On-Line Monitoring of TotalCarbon,Inorganic Carbon in Water by Ultraviolet,Persul-fate Oxida
13、tion,and Membrane Conductivity DetectionD4519 Test Method for On-Line Determination of Anionsand Carbon Dioxide in High Purity Water by CationExchange and Degassed Cation Conductivity3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D1129.1This test me
14、thod is under the jurisdiction of ASTM 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 May 1,2015.
15、Published August 2015.Originallyapproved in 1998.Last previous edition approved in 2009 as D6317 98(2009).DOI:10.1520/D6317-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,ref
16、er to the standards Document Summary 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 3.2 Definitions of Terms Specific to This Standard:3.2.1 inorganic carbon(IC),ncarbon in the form ofcarbon dioxide,carbonate ion,or bicarbonate ion.3.2.2 refractory material,nthat which cannot be oxidizedcompletely under the test method conditio
