Abstract:

Based on the colour reaction of Hg2+-5-Br-PADAP system, in the presence of β-CD and TritonX-100, hydrargyrum has been determined by spectrophotometry. The results show that the maximum absorbance wave length is at 565 nm with apparent molar absorption of 4.60 ×105 L/ (mol·cm). The Beer's law is obeyed in the range of 0~960 μg/L. The linear regression equation is A=0.002 3 c+0.007 1, with corresponding coefficient of 0.998 4. The method can be used for the determination of trace hydrargyrum in water with satisfactory results.

Key words: hydrargyrum, β-cyclodextrin, spectrophotometry

摘要：

探讨水中汞的分光光度测定方法。在β-环糊精和曲拉通X-100存在下，基于汞与2-（5-溴吡啶-2-偶氮）-5-二乙氨基苯酚的显色反应，采用分光光度法进行测定。结果表明，配合物的最大吸收波长为565nm，表观摩尔吸光系数为4.60×105L/（mol.cm），汞质量浓度在0~960μg/L范围内服从比尔定律，线性回归方程：A=0.0023c+0.0071（c为汞的质量浓度，μg/L），相关系数r=0.9984。本方法已用于水中痕量汞的测定，结果令人满意。

关键词: 汞, β-环糊精, 分光光度法

CLC Number: 

• TU991.21