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研究了在表面活性剂聚乙烯醇（PVA124）存在下，硝酸介质中，汞与碘化物形成络阴离子后与罗丹明B（RhB）形成可溶性多元离子缔合物，在595nm处有最大吸收，0～5μgHg2+／25ml范围内服从比耳定律，其表观摩尔系数为7．36×105，桑德尔灵敏度为2．7×10-4μg／cm2，回收率为98．0％～103．0％，RSD＜3％。
In the presence of the surfactant polyvinyl alcohol (PVA124), mercury and iodide form a complex anion associated with rhodamine B (RhB) in the nitric acid medium, with maximum absorption at 595 nm. The obeyed Beer’s law was in the range of ~5μg Hg2+/25ml, the apparent molar coefficient was 7.36×105, the Sandel sensitivity was 2.7×10-4μg/cm2, and the recovery was 98.0%-103.0%. RSD < 3%.