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CHEMICAL OXYGEN DEMAND Method 410.3 (Titrimetric, High Level for Saline Waters) STORET NO. 00340 1 Scope and Apphcat10n 1 1 When the chlonde level exceeds 1000 mg/1 the mmtmum accepted value for the COD w1llbe250mg/1 CODlevelswhlChfallbelowth1Svalueareh1ghlyquestlOnablebecause of the h1gh chlonde correct1on Wh1Ch must be made 2 Summary of Method 2 1 Orgalllc and oX1d1zable morgalllc substances m an aqueous sample are oX1d1zed by potasslUm d1chromate solutlOn m 50 percent (by volume) sulfunc aC1d solutlOn The excess d1chromate 1S tltrated w1th standard ferrous ammomum sulfate usmg orthophenanthrolme ferrous complex (ferrom) as an md1cator 3 Sample Handlmg and Preservatlon 31 Collect the samples m glass bottles, 1fposs1ble Use ofplastlc contamers 1S perm1ss1ble 1f1t 1S known that no orgalllc contammants are present m the contamers 32 B1ologlCally act1ve samples should be tested as soon as poss1ble Samples contammg settleable matenal should be well m1xed, preferably homogemzed, to perm1t removal of representat1ve ahquots 33 Samples should be preserved w1th sulfunc aC1d to a pH < 2 and mamtamed at 4°C untl1 analys1s 4 Interferences 41 Traces of orgalllc matenal e1ther from the glassware or atmosphere may cause a gross, pos1tlve error 4 1 1 Extreme care should be exerc1sed to aVOld mcluslOn of orgamc matenals m the d1stl1led water used for reagent preparation or sample d1lutlOn 4 1 2 Glassware used m the test should be cond1tloned by runnmg blank procedures to ehmmate traces oforgalllc matenal 42 Volatl1e matenals may be lost when the sample temperature nses dunng the sulfunc aC1d add1tlon step 43 Chlondes are quantltat1vely oX1d1zed by d1chromate and represent a pos1tlve mterference A chlonde correctlOn 1S made usmg the procedure outhned m 77 of th1S method 5 Apparatus 5 1 Reflux apparatus Glassware should conS1st of a 500 ml Erlenmeyer flask or a 300 m1 round bottom flask made of heat-res1Stant glass connected to a 12 mch Alhhn condenser by means of a ground glass Jomt Any eqmvalent reflux apparatus may be Subst1tuted prov1ded that a ground-glass connectlOn 1S used between the flask and the condenser Issued 1971 Ed1tonal reVlSlon 1978 410 3-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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