ASTM_D_7573_-_09.pdf

Designation:D757309Standard Test Method forTotal Carbon and Organic Carbon in Water by HighTemperature Catalytic Combustion and Infrared Detection1This standard is issued under the fixed designation D7573;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.1.Scope1.1 This test method covers the determination of totalcarbon(TC),inorganic carbon(IC),total organic carbon(TOC),dissolved organic carbon(DOC),and non-purgableorganic carbon(NPOC)in water,wastewater,and seawater inthe range from 0.5 mg/L to 4000 mg/L of carbon.Higher levelsmay be determined by sample dilution.The sample is injectedonto a quartz bed heated at 680C.The sample converts into agaseous phase and forced through a layer of catalyst ensuringconversion of all carbon containing compounds to CO2.Anon-dispersive infrared(NDIR)detector measures the resultingCO2.1.2 For TOC and DOC analysis a portion of the sample isinjected to determine TC or dissolved carbon(DC).A portionof the sample is then acidified and purged to remove the IC.The purged inorganic carbon is measured as TIC,or DIC.TOCor DOC is calculated by subtracting the inorganic fraction fromthe total carbon.TOC=TC IC.1.3 For NPOC analysis a portion of sample is acidified andpurged to remove IC.The purged sample is then injected todetermine NPOC.1.4 This test method was used successfully with reagentwater spiked with potassium hydrogen phthalate,sucrose,nicotinic acid,benzoquinone,sodium dodecyl benzenesulfonate,urea,acetic acid,and humic acid.It is the usersresponsibility to ensure the validity of this test method forwaters of untested matrices.1.5 This test method is applicable only to carbonaceousmatter in the sample that can be introduced into the reactionzone.The syringe needle or injector opening size generallylimits the maximum size of particles that can be so introduced.1.6 In addition to laboratory analyses,this test method maybe applied to stream monitoring.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.8 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.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 on WaterD3370 Practices for Sampling Water from Closed ConduitsD4129 Test Method for Total and Organic Carbon in Waterby High Temperature Oxidation and by CoulometricDetectionD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analysis3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D1129.3.2 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 total organic carbon(TOC),ncarbon in the form oforganic compounds.3.2.3 non-purgable organic carbon(NPOC),ncarbonmeasured in a sample after acidification and sparging toremove inorganic carbon.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.06 on Methods forAnalysis forOrganic Substances in Water.Current edition approved Oct.1,2009.Published November 2009.DOI:10.1520/D7573-09.2For 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.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 3.2.4 total carbon(TC),nthe sum of IC and TOC.3.2.5 dissolved organic carbon(DOC),ncarbon deter-mined on filtered samples.3.2.6 purgable organic carbon(POC),ncarbon thatpurges from acidified samples,also known as volatile organiccompounds(VOC).3.2.7 refractory material,nthat which cannot be oxidizedcompletely under the test method conditions.4.Summary of Test Method4.1 FundamentalsCarbon can occur in water as an inor-ganic and organic compound.This test method can be used tomake independent measurements of IC,NPOC,and TC,andcan also determine OC by the difference of TC and IC.DOC isdetermined on samples that have been filtered through a0.45-m filter.4.2 TOC and DOC procedures require that IC has beenremove