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&EPA United States Environmental Protection Agency Research and Development Test Method Environmental MOnitoring and Support Laboratory Cmcmnatl OH 45268 Organic C;arbon, Total (low level) (UV promoted, persulfate oxidation)-Method 41 q.2 1 Scope and ApplicatIon 1 1 This method covers the determination of total organic carbon In drinking water and other waters subject to the limitations In 1 3 and 51 1 3 This method IS applicable only to the carbonaceous matter which IS either soluble or has a partIcle size of 02 mm or less 1 4 The applicable range IS from approximately 50 Jlg/L to 10 mg /L Higher concentrations may be determined by sample dilution detector The detector signal IS Integrated and dIsplayed as the concentration of purgeable organic carbon The sample IS then transferred to a quartz ultraviolet reacflon cOil where the nonpurgeable organIcs are subjected to Intense ultravIolet Illumination In the presence of the aCidifIed persulfate reagent The nonpurgeables are converted to CO2 and transferred to a second sparger where a helium purge transfers the C02 to the reduction system and Into the detector The signal IS Integrated, added to the purgeable organic carbon value and displayed as the concentration of total organic carbon This Instrument IS designed for 1 2 a two-step operation to distingUish between purgeable and nonpurgeable organic carbon These separate values are not pertinent to this method 2 Summary of Method A sample IS combined with 1 mL of aCidified persulfate reagent and placed In a sparger The sample IS purged with helium which transfers Inorganic CO2 and purgeable organics to a CO2 scrubber The CO2 IS removed with at least 99 9% effiCiency with a 2 5-mlnute purge The purgeable organics proceed through a reduction system where the gas stream IS JOined by hydrogen and passed over a nickel catalyst which converts the purgeable organic carbon to methane The methane IS measured by a flame Ionization 4152-1 Dec 1982 3 3 1 by this procedure IS the sum of the purgeable organic carbon and the nonpurgeable organic carbon as defined In 3 2 and 3 3 3 2 Purgeable organic carbon IS the organic carbon matter that IS transferred to the gas phase when the sample IS purged with helium and which passes through the CO2 scrubber The definition IS Instrument- conditIon dependent 3 3 Nonpurgeable organic carbon IS defined as that which remains after removal of the purgeable organic carbon from the sample contamlng aCIdifIed persulfate reagent and which DefinItIons Total organic carbon measuredPDF Image | Methods for Chemical Analysis of Water and Wastes
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