重铬酸钾法测定化学耗氧量消除氯离子干扰新掩蔽剂的研究  

Research on new inhibitor of elimination of chloride ion interference indetermination of Chemical oxygen demand using potassiumdichromate

作　　者：陈峰 

机构地区：[1]福州市自来水总公司东南区自来水厂,福建福州350009

出　　处：《福建分析测试》2005年第2期2149-2151,共3页Fujian Analysis & Testing

摘　　要：本文提出了一种以重铬酸钾为氧化剂,以硝酸银和硝酸铋为掩蔽剂消除氯离子干扰,测定化学耗氧量的新方法,并研究了消化过程中的各种条件,如硫酸浓度、消化时间等。采用硝酸银和硝酸铋联合掩蔽剂可以取代标准重铬酸钾法测定(COD)中使用的硫酸汞,从而避免汞对环境的污染,并使用这种新方法测定了多种类型的水样。结果表明,本法操作简便、快速灵敏、准确度高,并具有广泛的适应性。A new method for the determination of chemical oxygen demand using potassiumdichromate as Oxidant and inhibitor using silver nitrate and bismuth nitrate to elimination of chloride ion interference, various conditions of digestion process, such as sulfuric acid concentration and digestion time. The united inhibitory method using silver nitrate and bismuth nitrate may replace the mercuric sulfate in standard potassium dichromate method for the determination of chemical oxygen demand avoid mercuric pollution to environment, Using the new method, We determined various water samples. the result shows, this new method is simple, rapid, sense and has high correction, also possesses wide suitability.

关 键 词：氯离子干扰 化学耗氧量 重铬酸钾法 测定 联合掩蔽剂 消化过程 硫酸浓度 消化时间 硝酸铋 硝酸银 氧化剂 硫酸汞 准确度 适应性 污染 环境 水样 

分 类 号：X832[环境科学与工程—环境工程] X832.02