Comparison of Dichromate Method and Rapid Digestion Spectrophotometry for Determination of Chemical Oxygen Demand
This paper were analyzed the detection limit,precision,trueness and actual samples of different industries were analyzed by bichromate method and fast digestion spectrophotometry,as well as the reagent pretreatment,operation steps,digestion time,calculation formula,the amount of waste liquid produced and experimental efficiency were compared.The accuracy and applicability of the two detection methods are emphatically discussed.It can be seen from the analysis that the results of COD determination in actual water samples by the two detection methods are similar.The detection limit,precision and trueness meet the requirements of the detection method,and there is no obvious difference in the results.The reagent used in fast digestion spectrophotometry does not need to be pre-treated,the instrument is simple to operate,the digestion time is short,the experimental results are read directly without calculation and the amount of waste liquid is less,the experimental efficiency is higher,and the applicability of rapid detection in large quantities or burst detection is much higher than that of dichromate method.
chemical oxygen demanddichromate methodfast digestion spectrophotometric method
万方数据
维普
