催化光度法测定痕量铬(Ⅵ)的研究

Catalytic Spectrophotometric Determination of Trace Chromium(Ⅵ).

基于在稀磷酸介质中，铬（Ⅵ）对溴酸钾氧化结晶紫有催化作用，提出了测定痕量铬（Ⅵ）的新催化光度法，检出限为２５×１０－９ｇ／Ｌ，线性范围为０２～４０μｇ／２７ｍｌ。应用于测定地面水及地下水的铬（Ⅵ），结果满意。

Based on the catalytic effect of trace chromium (Ⅵ) on the oxidation of crystallize violet with potassium bromate in the medium of H 3PO 4,a determination of chromium (Ⅵ) was established by catalytic spectrophotometry.The detection limit for chromium (Ⅵ) is 2 5×10 -9 μg/ml.The linear range of the determination is 0 2～4 0μg/27ml and the recoveries are 92～105%.The method is used for the determination of Cr (Ⅵ) in water with satisfactory results.