微机控制-薄层流动计时库仑分析法测定电镀废水中的铬

Determination of Chromium(Ⅵ) in the Waste Water of Electroplate by Computer-controlled Chronocoulometry

目的 研究微机控制 -薄层流动计时库仑分析法在电镀废水中铬含量测定中的应用。 方法 建立微机控制 -流动计时库仑分析法 ,对水中 Cr( )含量进行测定。 结果 线性范围为 3～ 2 4mg/L,相对标准偏差<0 .1% ,回收率 98.0 %～ 10 3.0 %。 结论 流动计时库仑分析法克服了电容电流及电极表面性质改变等噪声干扰 ,具有快速灵敏、准确、再现性好的优点 ,对水中 Cr( )的测定获得满意结果。

Objective To study the application of computer controlled chronocoulometry for determination of chromium(Ⅵ) in waste water of electroplate. MethodsA kind of computer controlled chronocoulometry was developed and applied to the determination of chromium(Ⅵ). Results The linear range of chromium(Ⅵ) was 3~24 mg/L, and the relative standard deviation was less than 0 1%. The recovery was 98%~103% in the determination of chromium(Ⅵ) in waste water. Conclusion Chronocoulometry could overcome noise disturbance resulting from capacity current method and variety of property of electrode surface. This method is sensitive, accurate and well reproducible. It has been applied to determination of chromium(Ⅵ) in waste water with satisfactory results.