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74 Titrate with standard ferrous ammomum sulfate (63) usmg 10 drops of ferrom (65) mdlcator (This amount must not vary from blank, sample and standardizatIOn) The color change IS sharp, gomg from blue-green to reddish-brown and should be taken as the end pomt although the blue-green color may reappear wlthm mmutes 75 Run a blank, usmg 50 ml of dlstl1led water m place of the sample together With all reagents and subsequent treatment 76 For COD values greater than 800 mg/l, a smaller ahquot of sample should be taken, however, the volume should be readjusted to 50 ml With dlstl1led water havmg a chlonde concentratIOn equal to the sample 77 Chlonde correctIOn(l) Prepare a standard curve of COD versus mg/I of chlonde, usmg sodIUm chlonde solutIOns of varymg concentratIOns followmg exactly the procedure outhned The chlonde mterval, as a mlmmum should be 4000 mg/I up to 20,000 mg/I chlonde Lesser mtervals of greater concentratIOns must be run as per the reqUIrements of the data, but m no case must extrapolatIOn be used 8 CalculatIOn where mg/lCOD=[(A-B)Cx8,000]-SOD x12 ml of sample A = ml Fe(NH4)2(S04)2 for blank, B = ml Fe(NH4)lS04)2 for sample, C = normahty of Fe(NH4)lS04)2, D = chlonde correctIOn from curve (step 7 7) I 2 = compensatIOn factor to account for the extent ofchlonde OXidatIOn which IS dlsslml1ar m systems contammg orgamc and non-orgamc matenal 9 PrecIsion and Accuracy 9 1 PrecIsion and accuracy data are not aval1able at thiS time BIblIography 1 Burns, E R, Marshall, C, Journal WPCF, Vol 37, P 1716-1721 (1965) 410 3-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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