浊点萃取-高分辨连续光源石墨炉原子吸收光谱法测定环境水样中的痕量铅

比较了三种不同的分离富集方法——共沉淀法、离子交换法和浊点萃取法对水样中痕量铅的富集效果，其中，浊点萃取法水样用量少、富集因子大、操作简便，故选取浊点萃取法对环境水样中的铅进行富集。采用浊点萃取-高分辨连续光源石墨炉原子吸收光谱法测定了采自北京市通惠河水样中的痕量铅。结果表明，该测定方法的检出限为0.08 μg·L-1，相对标准偏差为1.3%~4.5%(n=6)，加标回收率为93%~108%，样品溶液的富集因子为29。通惠河13个采样点水样中铅含量均符合国家规定的地表水水质Ⅰ类水标准，且从通州区至朝阳区呈现铅含量逐渐减少的趋势。

Determination of Trace Lead in Environmental Water by Cloud Point Extraction-High Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry

Comparison investigations were performed for the enrichment method of lead in environmental waters, including coprecipitation, ion exchange and cloud point extraction(CPE). CPE was selected as the optimal enrichment method because of its less consumption of water sample, higher enrichment factor and simpler procedure than the other enrichment methods. Pb contents in the water samples from Tonghui River in Beijing were determined by high resolution continuum source graphite furnace atomic absorption spectrometry coupled with CPE enrichment. The results indicate that the limit of detection of the method is 0.08 μg·L-1, the relative standard deviation (RSD) is 1.3% to 4.5% (n=6), the recovery of Pb contents is 93% to 108%, and the enrichment factor of CPE method is 29. The Pb contents in the 13 water samples from Tonghui River all conform to the Environmental Quality Standards for Surface Water (Grade I). Moreover, the Pb content in the whole river exhibits a decreasing trend from Tongzhou district to Chaoyang district.