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ORGANIC CARBON, TOTAL Method 415.1 (Combustion or Oxidation) STORET NO. Total 00680 Dissolved 00681 1 Scope and ApphcatIOn 11 Th1s method mcludes the measurement of orgamc carbon m drmkmg, surface and saline waters, domest1c and mdustnal wastes ExclusIOns are noted under DefimtIOns and Interferences 12 The method 1S most apphcable to measurement oforgamc carbon above 1mg!1 2 Summary of Method 21 Orgamc carbon m a sample 1S converted to carbon dIOx1de (C02) by catalytiC combustIOn or wet chem1cal oX1datIOn The CO2 formed can be measured d1rectly by an mfrared detector or converted to methane (CH4) and measured by a flame IOmzatIOn detector The amount of CO2 or CH4 is d1rectly proportIOnal to the concentratIOn of carbonaceous matenal m the sample 3 DefimtIOns 31 The carbonaceous analyzer measures all of the carbon m a sample Because of vanous properties of carbon-contammg compounds m hqUld samples, prehmmary treatment of thesamplepnortoanalysisd1ctatesthedefimtIOnofthecarbonas1t1Smeasured Forms of carbon that are measured by the method are A) soluble, nonvolatl1e orgamc carbon, for mstance, natural sugars B) soluble, volatl1e orgamc carbon, for mstance, mercaptans C) msoluble, partially volatl1e carbon, for mstance, O1ls D) msoluble, partlCulate carbonaceous matenals, for mstance, cellulose fibers E) soluble or msoluble carbonaceous matenals adsorbed or entrapped on msoluble morgamc suspended matter, for mstance, Olly matter adsorbed on Sllt particles 32 The final usefulness of the carbon measurement 1S m assessmg the potential oxygen- demandmg load of orgamc matenal on ~ rece1vmg stream Th1s statement apphes whether the carbon measurement 1S made on a sewage plant effiuent, mdustnal waste, or on water taken d1rectly from the stream In th1s hght, carbonate and b1carbonate carbon are not a part of the oxygen demand m the stream and therefore should be discounted m the final calculatIOn or removed pnor to analys1s The manner of prehmmary treatment of the sample and mstrument settmgs defines the types of carbon whlCh are measured Instrument manufacturer's mstructIOns should be followed Approved for NPDES Issued 1971 Ed1tonal reV1S10n 1974 415 I-IPDF Image | Methods for Chemical Analysis of Water and Wastes
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