Calculate the COD value of wastewater. A 10ml sample of
water was refluxed with 60ml of K2Cr2O7 solution & after
refluxing the excess unreacted dichromate required 24ml of
0.1N FAS solution. A blank of 10ml of d/w of refluxing with
60ml of dichromate solution required 35ml of 0.1N FAS
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