Exploration of Dissolution Time in the Determination of Chemical Oxygen Demand in Domestic Wastewater by Dichromate Method
According to the Determination of Chemical Oxygen Demand in Water Quality-Dichromate Method(HJ 828-2017),there is a problem of low work efficiency caused by long digestion time when measuring CODCr.This article determines the CODCr of certified standard samples and influent water samples from Taiyuan sewage treatment plant at different digestion times,and concludes that the CODCr measured when the digestion time is shortened from 120 min to 60 min also meets the accuracy and precision requirements of the method.Therefore,shortening the digestion time appropriately can also meet the detection requirements of chemical oxygen demand in domestic sewage in Taiyuan City.
chemical oxygen demanddichromate methoddissolution timedomestic sewage
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