铅对人体有害,因此铅离子是工业污水排放的重要控制指标之一。检测铅离子的方法有原子吸收法和双硫腙比色法。前者直接测定工业废水中的铅,灵敏度不高;后者操作步骤繁琐,须使用剧毒试剂氰化钾,污染了环境。用催化极谱法能测定铅近ppb级,而且仪器简单、操作简便、测定快速,但应用于废水中 Lead is harmful to the human body, so lead ion is one of the important control indicators of industrial wastewater discharge. Methods of detecting lead ions are atomic absorption spectrometry and dithizone colorimetric method. The former direct determination of lead in industrial wastewater, the sensitivity is not high; the latter tedious steps, the use of highly toxic reagents to be used potassium cyanide, pollute the environment. Catalytic polarography can be used to determine Pb near ppb level, and the instrument is simple, easy to operate, rapid determination, but used in wastewater