摘要
用ｐＨ＝１０的ＮａＯＨ水溶液解析铜－２，２′－联喹啉（ｂｉｑ）－溴酚蓝（ＢＰＢ）三元络合物，使ＢＰＢ进入水相，向其中加入与ＢＰＢ颜色相近的碱性染料结晶紫（ＣＶ），形成等色染料离子对ＣＶＢＰＢ而被苯浮选，将浮选物溶于乙醇，于最大吸收波长５９０ｎｍ处进行光度测定。由于两种染料等色并同时参与显色，使本方法具有较高的灵敏度。２，２′－联喹啉为铜的特效试剂，因此方法选择性亦好。ε＝１．４５×１０５Ｌｍｏｌ－１ｃｍ－１，铜的含量在０～０．４ｍｇ／Ｌ服从比耳定律。对含铜量４．８×１０－８ｇ／ｍＬ的水样平行测定５次，相对标准偏差为３．６％，回收率为９７．８％～１０１．７％。
Bromophenol blue(BPB)was produced and entered into the aqueous phase when NaOH solution of pH=10 was added to Cu(biq) 2BPB by trichloromethane and isoamyl alcohol(20∶1) extractive.And then CV·BPB was floated by crystal violet(CV)with benzene solution.The flotation was dissolved in ethanol and the absorbance of the solution measured at 590nm.The sensitivity was raised because of the two dyes assistant effect.The molar absorptivity was 1 45×10 5 L·mol -1 ·cm -1 .Copper in the sample was separated first by extracting the Cu(biq) 2BPB complex with trichloromethane and isoamyl alcohol,thus achieving a high selectivity.Beer's law was obeyd in the range of 0 0 4 mg/L with a relative standard deviation of 3 6%.For 4 8×10 -8 g/mL copper solution,the recoveries were 97 8% 101 7%.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1999年第1期102-103,共2页
Spectroscopy and Spectral Analysis
关键词
铜
溴酚蓝
结晶紫
浮选光度法
测定
Copper, Bromophenol blue, Crystal violet, Flotation spectrophotometry
