一种测定工业废水中Hg^(2+)的新方法

A New Method to Determine Hg^(2+) in Industrial Waste Water

研究了碱性染料亚甲基蓝 (MB)同 KBr与 Hg2 + 络合形成的稳定络合物用于分光光度法测定 Hg2 + 的方法。在柠檬酸 -硫酸缓冲介质 p H=3 .8的条件下 ,络和物的最大吸收波长λmax=6 5 7nm,表观摩尔吸光系数 ε=1 .0 6× 1 0 5L· mol- 1· cm- 1 ,该络和物的组成为 n(Hg2 + )∶ n(Br- )∶ n(MB) =1∶ 3∶ 1 ,线形范围为 0 .0 1 8～ 0 .80 0 μg·m L- 1。具有灵敏度高、稳定性好的特点。并对实际水样进行了测定 ,结果可靠。

The chelate of methylence blue(MB),potassium bromide and Hg 2+ used in determination of Hg 2+ by spectrophotometric method has been studied. In the media of pH=3.8 citric acid sulfuric acid, the molar absorptivity is 1.06×10 5 L·mol -1 ·cm -1 at λ=657nm. The experiments proved that chelate formed Hg 2+ with bromine and methylene blue is 1∶3∶1.The result coming from determination of the lake water proved that the method is reliable, sensitive , and repeatable.