四川师范大学学报（自然科学版）2001，Vol.24Issue(3)：283-285,3.
硫氰酸盐-吖啶红分光光度法在水相中测定痕量汞
Spectrophotometric Determination of Trace Mercury in Aqueous Solution with Thiocyanate-Acridine Red
摘要
Abstract
A highly sensitive spectrophotometric method for determination of mercury has been developed,based on mercury in an excess of thiocyanate to form Hg(SCN)2-4,then formation of the 1∶2 ion-association complex of Hg(SCN)2-4 with acridine red in the presence of polyvinyl alcohol-gum Arabic.The molar absorptivity is 3.1×105 L*mol-1*cm-1.The maximum absorbance of ion-association against the reagent blank is at 583 nm.Beer's law is obeyed in the range of 0～9 μg Hg(Ⅱ)/25 mL.The relative standard deviation for the determination of 4.0 μg Hg(Ⅱ)/25 mL is 2.1%(n=9),and the detection limit is 0.35 μg Hg(Ⅱ)/(3σ,n=11).The procedure is relatively simple.Elimination of liminated the interference is achieved by adding the mixed masking agents of potassium fluoride-sulphosalicylic acid-citric acid into sample solution,so the determination has very good selectivity.Trace mercury in aqueous solution has been satisfactorily determined directly by the method.关键词
汞/硫氰酸盐/吖啶红/分光光度法分类
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刘希东..硫氰酸盐-吖啶红分光光度法在水相中测定痕量汞[J].四川师范大学学报（自然科学版）,2001,24(3):283-285,3.
