硫代米■酮显色树脂相分光光度法测定黄河水中痕量汞(Ⅱ)

DETERMINATION OF TRACE MERCURY(Ⅱ)IN HUANGHE RIVER WITH THIO-MICHLER' S KETONE RESIN-PHASE SPECTROPHOTOMETRY

在pH5．0～6．5条件下，汞（Ⅱ）与硫代米酮生成紫红色配合物，用732型强酸性阳离子树脂交换吸附进行树脂相分光光度法测定痕量汞（Ⅱ）。结果表明，有色配合物树脂相的最大吸收波长为590nm，汞（Ⅱ）含量在0～08mg·L-1范围内符合Beer定律，表观摩尔吸光系数为4．26×105L·mol-1·cm-1.用于黄河水中痕量汞（Ⅱ）的测定，相对标准偏差小于3．2％，加标回收率为95％～102％

A resin-phase spectrophotometric method for the determination of trace mercury (Ⅱ ) based on formation of the purpkish red complex with thio--michler's ketone under the condition of pH 5. 0 ~ 6. 5 is described. The maximum absorption wavelength is at 590 um, the apparent molar absorption coefficient is 4. 26 × 105 L· mol-1· cm-- 1. The Beer's law is obeyed for the concentration of mercury(Ⅱ ) in the range of 0 ~ 0. 8 mg· L- 1. The proposed method has been applied to the determination of trace mercury（Ⅱ ) in Huanghe River samples. The recoveries are from 95 % to 102 % and the relative standard deviation is less than 3. 2 %.