【摘要】 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％。更多还原

【Abstract】 A spectrophotometric method for the determination of trace amounts of mercury (Ⅱ ) was described based on the formation of a complicated ion-association complex of Hg (Ⅱ )-Ⅰ-Rhodamine B in ihe presence of polyvinyl alcohol. The maximum absorption of the ion-association complex was at 595nm, Beer’s law was obeyed for mercury (Ⅱ ) in the range of 0~5μg/25ml. The apparent molar absorptivity was 7. 36 ×105L/mol·cm. The recovery of mercury was 97. 0% ~ 103. 0%,RSD<3%. The procedure was highly selective with good sensitivity and the result of deiermination was satisfactory.更多还原