催化荧光法测定痕量铬(Ⅵ)

Catalytic Spectrofluorimetric Determination of Trace Chromium(Ⅵ)

在ＨＡc－ＮaＡc缓冲介质中，痕量铬（Ⅵ）对过氧化氢与罗丹明Ｂ的氧化还原反应具有催 化作用，使罗丹明Ｂ的荧光减弱，据此建立了催化荧光法测定痕量铬（Ⅵ）的新方法。方法的检测限为３．３２ｒｇ／Ｌ，测定范围为０．０１～０．１６ｍｇ／ＬＣｒ（Ⅵ）。本法已用于测定电镀液、电镀废液中痕量Ｃr（Ⅵ），结果令人满意。

A catalytic fluorimetric method is reported for the determination of trace chromium(Ⅵ ). The method is based on the catalytic effect of chromium(Ⅵ ) for the oxidation of rhodamine B by hydrogen peroxide in weak acidic solution. The detection limit for chromium(Ⅵ ) is 3. 32 μ/L, the linear range of the determination is 0.01 ~ 0. 16 mg/L. The proposed method has been used to determine chromium(Ⅵ ) in electroplating liquor, electroplating waste water and electroplating effluent with saitsfactory results.