摘要：

利用还原型若丹明B(RRhB)与KClO3的显色反应,对含Ni²⁺电镀废液中痕量Ni²⁺进行测定。结果表明,在pH为5.3HAc-NaAc缓冲溶液中具有高灵敏的显色反应,产物的最大吸收波长为555nm,方法的检出限为4.3×10^-8g L,催化程度与Ni²⁺量在0～0.060mg L范围内符合比耳定律,加标回收率为96.5%～104%(n=6)。本法结合萃取分离,满意地测定了电镀废液中的微量镍。

关键词: 镍, 若丹明B, 催化光度法, 电镀废液

Abstract:

The reaction of Rhodamine B (RRhB)with KClO3 is used to determine trace Ni²⁺ in electroplating wastewater containing Ni²⁺.The results show that the chromogenic reaction has high sensitivity in pH 5.3 HAc-NaAc buffer solu-tion.The maximum absorption of the system is at 555 nm,the detection limit of the method is 4.3×10^-8g L for Ni²⁺,Beer' s law accords with Ni²⁺ in the range of 0～ 0 .06 mg L and the recovery of adding standard solution is 96.5%～104%(n =6).Combinedwith solvent extraction separation, the method has been applied to the determination of trace Ni in electroplating wastewater with satisfactory results.

Key words: nickel, Rhodamine B, catalytic spectrophotometry, electroplating wastewater

中图分类号: 

• O657.3