电沉积-钨丝电热原子吸收光谱法测定水样中的铅

Determination of lead in water by electrodeposition-tungsten coil electrothermal atomic absorption spectrometry

研制了一种便携式钨丝电热原子吸收光谱分析装置，其主要包括：钨丝电热原子化器、多道微型CCD光谱仪、仪器电源系统以及控制系统。并将电沉积分离富集技术与该钨丝电热原子吸收光谱分析仪器结合，完成环境水样中铅的现场分析。并对铅的电沉积条件作了研究，最佳电沉积电位为负650mV（vs．SCE），方法检出限：0．20μg/L，线性范围：1～15μg/L，对4μg/LPb标准溶液10次重复测试，RSD为4．4％。

A field tungsten coil electrothermal atomic absorption spectrometer has been constructed. It consists of tung- sten coil atomizer, multi - channel minitype CCD spectrometer, instnnnent power supply, and control system. The lead in environmental water sample is determined after is preconcentrated and separated by electrodeposition. Electro- deposition condition is investigated. The optimized electrodeposition potential is -650 mV （vs. SCE）. The detection limit for lead in water was estimated to be approximately 0.20μg/L. Linear range is from 1.0 to 15.0 μg/L. The relative standard deviation is 4.4% by analyzing 4.0 μg/L lead （n = 10）.