The Research Of Determination Of COD_Cr

COD is one of the important indicators of comprehensive to evaluate the degree of water pollution, It is the main indicators that water is directed by reducing pollution . In a certain extent, it is characterized by the reduction of water pollution (mainly organic pollutants) pollution.The standard Determination of the chemical oxygen demand is dichromate method , with the most widespread application. However, the method is a long process, the reagent consumption, the more serious secondary pollution; Reflux device by the restrictions, it is difficult in analysis of large quantities of samples. In order to improve these shortcomings, shorten analysis time, Analysts staff a better method such as raising the pH, change catalyst, factor correction, change and improve equipment and other measures. Which digestion - spectrophotometry is most widely used.This paper introduces the instrument and the method of Spectrophotometric Determination of COD. Apparatus the method of Spectrophotometry with the standard method. By comparing the experimental data, The results were consistent on the accuracy and precision with the resultst of the standard method;This paper introduces and study variety method of Determination COD of the high chlorine wastewater. Through numerous experimental data to prove the method to be able to more convenient and accurate determination of the high chlorine wastewater under certain conditions. and summarizes several main advantages and disadvantages of Analysis;This paper comparative studied organic matter oxidation effects in determination of wastewater samples with catalysts (Ag₂SO₄ and other metal salts) or without catalyst or reduce the amount of Ag₂SO₄. and It is studied that the determination with the sulfur - phosphorous acid mixed media respectively MnSO₄ and CuSO₄ as a catalyst for water samples.In this paper, It is aggregated that Analysis of the history of the development application and the history of the development Several of the latest COD analysis method in the Environmental Protection Administration. Application CODCr analysis of the environmental protection work in China at this stage to analyze the status of the determination of chemical oxygen demand of the latest developments, direction of development and future prospects. It can optimizate reference for Environmental monitoring staff to choose methods of analysis.