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近年来,恒电流库仑法在环保部门得到了应用,本文选定硫、磷混合酸电解质体系和铂电极-硫酸亚汞参比电极作终点检测电极对,同时选用硫、磷混合酸消解液,在COD含量5毫克·升~(-1)至上万毫克·升~(-1)范围内,不用稀释或稍加稀释,便可测定。对上海市数百家工厂水质及黄浦江、苏州河、淀山湖水质进行了标准法和本仪器法对照测试,数据基本吻合。实验部分一仪器和试剂 COD-I电量测定仪及其附件重铬酸钾标准溶液:配制此溶液使相当于仪器面板COD数字显示值为66毫克·升~(-1),标定仪器用。
In recent years, the constant current coulometry has been applied in the environmental protection department. In this paper, sulfuric acid and phosphorous mixed acid electrolyte system and platinum electrode - mercuric sulfate reference electrode as the detection electrode pairs were selected. At the same time, In the COD content of 5 mg · liter ~ (-1) to tens of thousands of milligrams · liter ~ (-1) range, without dilution or a slight dilution, can be measured. The water quality of hundreds of factories in Shanghai and the Huangpu River, Suzhou River, Dianshan Lake water quality standards and the instrument control test, the data are basically consistent. Experimental part of an instrument and reagent COD-I power meter and its accessories Potassium dichromate standard solution: Preparation of this solution to make the equivalent of the instrument panel COD digital display value of 66 mg · liter -1, calibration equipment.