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1 Scope and ApphcatlOn 2 3 4 Summary of Method 21 Orgamc and oXIdIzable Inorgamc substances In,the sample are oXIdIzed by potassIUm dIchromate In 50% sulfunc aCId solutlOn at reflux temperature SlIver sulfate IS used as a catalyst and mercunc sulfate IS added to remove chlonde Interference The excess dIchromate IS titrated wIth standard ferrous ammomum sulfate, USIng orthophenanthrohne ferrous complex as an IndIcator Samphng and PreservatlOn 31 Collect the samples In glass bottles, If possIble Use of plastic contaIners IS permIssIble If It IS known that no organic contamInants are present In the contaIners 32 BlOloglCally active samples should be tested as soon as possIble Samples contaInIng settleable matenal should b~ well mIxed, preferably homogemzed, to permIt removal of representatIve ahquots 33 Samples should be preserved WIth sulfunc aCId to a pH < 2 and maIntamed at 4°C until analysIs Interferences 1 1 12 1 3 The ChemlCal Oxygen Demand (COD) method determInes the quantIty of oxygen requIred to oXIdIze the orgamc matter In a waste sample, under specIfic condItions of OXIdIZIng agent, temperature, and time SInce the test utlhzes a specIfic chemIcal oXldatlOn the result has no defimte relatlOnshlp to the BlOchemlCal Oxygen Demand (BOD) of the waste or to the Total Orgamc Carbon (TOe) level The test result should be consIdered as an Independent measurement of orgamc matter In the sample, rather than as a SubstItute for the BOD or TOC test The method can be apphed to domestic and Industnal waste samples havIng an orgamc carbon concentratlOn greater than 50 mg/1 For lower concentratlOns of carbon such as In surface water samples, the Low Level ModlficatlOn should be used When the chlonde concentratlOn of the sample exceeds 2000 mg/1, the modlficatlOn for salIne waters IS reqUIred 4 1 Traces of orgamc matenal eIther from the glassware or atmosphere may cause a gross, pOSItive error 4 1 1 Extreme care should be exercIsed to aVOid mcluslOn of orgamc matenals 10 the dlstlIled water used for reagent preparatlOn or sample dlIutlOn 4 1 2 Glassware used In the test should be condltlOned by runmng blank procedures to ehmInate traces oforgamc matenal Approved for NPDES Issued 1971 Edltonal reVlSlOn 1978 CHEMICAL OXYGEN DEMAND Method 410.1 (Titrimetric, Mid·Level) 410 I-I STORET NO. 00340PDF Image | Methods for Chemical Analysis of Water and Wastes
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