中文摘要：

聚乙烯醇（PVA）存在下[Hgl4]^2-与罗丹明B（RHB）形成配合物[Hgl4]^2-RHB-PVA，在波长610nm处有最大吸收，表观摩尔吸光系数ε=6．02×10^5L／（mol·cm）。结合巯基棉（SCF）对汞的选择性吸附，实现了水样中痕量汞的分离、富集与测定。标准样品富集前后测定的相对标准偏差RSD分别为4．25％和7．40％（n=6）。本法应用于三岼水域长江和嘉陵江江段中总汞的测定，回收率为90．6％-111．4％，最低检出浓度0．040μg／L，对比国控点原子荧光光谱分析法监测汞数据．结果令人满意。

英文摘要：

The complex [Hgl4]^2- -RHB-PVA is formed from [Hgl4]^2- and B （RHB） when PVA exists. It has a maximum absorption at 610nm with molar absorptivity ε of 6.02 × 10^5 L/（ mol · cm）. According to the character of Sulphydryl Cotton Fiber （SCF） which can absorb selectively mercury, the optimum enriching condition, separation and spectrophotometric analysis technique of trace mercury have been discussed in this paper. The RSD determined before and after enrichment of the standard samples is 4. 25% and 7.40% （n =6） respectively. The method had been applied to analyze the total mercury of the water in the Three- Gorges of Yangtze River and some sections of Jialing River with recovery of 90. 6% -111.4% and detectable threshold of 0. 040μg/L. Compared with the spectrographic method of atomic fluorescence for total trace mercury quantitative analysis, it showed a satisfied result.