Cu(Ⅱ)-还原型罗丹明B-KBrO_3光度法测定痕量铜

Cu(Ⅱ)-Reductinic Rhodamine B-KBrO_3 Spectrophotometric Determination of Trace Amount of Copper

本文基于在弱酸性的介质中,Cu(Ⅱ)能较好地催化溴酸钾氧化还原型罗丹明B此一显色反应,从而建立了一个测定痕量铜的新方法。本方法的灵敏度为8×10- 9 g·m L- 1 ,线性范围为0～0.5 μg/25m L,已用于水及若干蔬菜中痕量铜的测定,结果满意。

The article is based on the fact that Cu(Ⅱ) can satisfactorily catalyze the colour reaction of KBrO\-3 oxidizing reductinic Rhodamine B in week acid.The authors found a new method to measure trace amount of copper.The sensitivity of this method is 8×10\+ -9 g·mL\+ -1 .Linear range is 0~0 5 μg/25mL.It has been applied to measure trace amount of copper in water and vegetables with satisfactory results.