双环已酮草酰二腙分光光度法快速测定农村饮用水中痕量铜

Spectrophotometric determination of trace copper in drinking water with biscyclohexanone oxaldihydrazone(BCO)

目的：在国标法双乙醛草酰二腙分光光度法的基础上,建立一种可以快速测定饮水中痕量铜的方法。方法：在pH 9的条件下,水中铜离子与双环已酮草酰二腙反应生成蓝色络合物,颜色的深浅与铜离子的含量在一定浓度范围内成正比。根据颜色的深浅在605 nm下比色定量。结果：方法最低检测浓度为0.04 mg/L;对低,中,高三个浓度,每个浓度6次的精密度实验表明,其RSD%分别为1.7%,1.2%和1.3%;6次盲样测定的相对误差在0.8%~2.3%之间。结论：该方法比国标法简便,快速,可以用于水中痕量铜的测定。

Objective：To establish a quick-detected method of determing copper in drinking water based on GB/T 5750.6-2006.Methods：Cu2＋ reactes with biscyclohexanone oxaldihydrazone in pH9 water solutions to generate one kind of blue chelate compounds which can be detected at 605nm using spectrophotometry.Results： The LOQ of this method is 0.04mg/L and the RSD% of three different concentrations is 1.7%,1.2% and1.3% respectively.The relative error of 6 blind samples is between 0.8% and 2.3%.Conslusion：The method can be used to determine trace copper of drinking water.It is more convenient and quicker than the national standard method.