【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。更多还原

【Abstract】 The reaction of Rhodamine B (RRhB) with KClO3 is used to determine trace Ni2+ in electroplating wastewater containing Ni2+.The results show that the chromogenic reaction has high sensitivity in pH 5.3 HAc-NaAc buffer solution. The maximum absorption of the system is at 555 nm ,the detection limit of the method is 4.3×10-8 g/L for Ni2+,Beer’s law accords with Ni2+ in the range of 0～0.06 mg/L and the recovery of adding standard solution is 96.5%～104%(n=6).Combined with solvent extraction separation, the method has been applied to the determination of trace Ni in electroplating wastewater with satisfactory results.更多还原