氯化钠-硫氰酸铵-丁基罗丹明B体系浮选分离汞(Ⅱ)的研究

来源期刊：冶金分析2010年第6期

论文作者：涂常青

文章页码：45 - 49

关键词：汞(Ⅱ)； 浮选分离测定； 硫氰酸铵； 丁基罗丹明B

Key words：mercury(Ⅱ)； determination via flotation separation； ammonium thiocyanate； butyl rhodamin B

摘    要：研究了氯化钠-硫氰酸铵-丁基罗丹明B体系浮选分离测定汞(Ⅱ)的行为及其与常见离子分离的条件。结果表明:控制溶液的酸度为pH2.0,在固体NaCl用量为1.0g的情况下,当0.01mol/L NH₄SCN溶液和1.0×10^-3 mol/L丁基罗丹明B溶液的用量分别为0.50mL、1.00mL时,Hg2+可被硫氰酸铵-丁基罗丹明B-水体系浮选,而Zn²⁺,Mn²⁺,Ni²⁺,Co²⁺,Cd²⁺等离子在该体系中不被浮选,据此实现了Hg²⁺与这些离子的定量分离。用该体系对合成水样和工业废水中微量Hg²⁺进行的定量浮选分离后,再用5-Br-PADAP分光光度法测定,结果与双硫腙光度法相符,样品标准加入回收率为95%～105%,RSD为2.2%～2.9%。

Abstract: The determination of Hg(Ⅱ) was performed via flotation separation using sodium chloride-ammonium thiocyanate-butyl rhodamine B system and the conditions for the separation of mercury(Ⅱ) from other metal ions were studied. The results showed that when the dosages of solid NaCl, NH₄SCN solution (0.01 mol/L) and butyl rhodamine B (Bu-RhB) solution (1.0×10^-3 mol/L) were 1.0 g, 0.50 mL and 1.00 mL, respectively, Hg²⁺ could be floated by NH₄SCN-Bu-RhB-H2O system at pH 2.0, while Zn²⁺, Mn²⁺, Ni²⁺, Co²⁺ and Cd²⁺ could not be floated, realizing the quantitative separation of Hg²⁺ from these ions. This method has been applied to the quantitative flotation separation and determination of trace Hg²⁺ in synthetic water and industrial waste water samples. The results were consistent with those obtained by dithizone method. The standard addition recoveries were 95%-105%, and the relative standard deviation (RSD) was 2.2%-2.9%.