摘要
提出了等色染料离子对浮选光度法。向罗丹明６Ｇ（Ｒ６Ｇ）和Ｐｔ（ＳｎＣｌ３）３－５的异丙醚浮选物Ｐｔ（ＳｎＣｌ３）５（Ｒ６Ｇ）３中，加入ｐＨ＝５．５的醋酸－醋酸铵缓冲溶液，使Ｒ６Ｇ离子进入水相。并向其中加入与Ｒ６Ｇ颜色相同的四溴荧光素（ＴＢＦ），形成等色染料离子对Ｒ６Ｇ＋ＴＢＦ－，再被甲苯浮选。将浮选物溶于丙酮，于５３０ｎｍ处进行光度测定。由于６个染料分子（ＰｔＲ６ＧＴＢＦ）＝（１３３）同时吸光，使本方法具有很高的灵敏度；ε＝５．９２×１０５Ｌｍｏｌ－１ｃｍ－１，铂含量在０～２．０μｇ／１０ｍＬ遵从比耳定律，相对标准偏差为３．８％。方法应用于催化剂中铂的测定，结果满意。
The flotation spectrophotometric method for the determination of platinum with isochromatic dye ionpair is described.Rhodamine 6G(R6G) was produced and entered into aqueous phase when pH=5.5 buffer solution was added to the Pt(SnCl_3)_5(R6G)_3 by isopropyl ether flotation.And then R6G.TBF was floated by tetrabromofluorescein(TBF)with toluene.The floatation was dissolved in acetone and absorbance of the solution was measured at 530nm.The sensitivity was raised because of the six dyes (Pt∶R6G∶TBF=1∶3∶3) assistant effect.The molar absorptivity of this method is 5.92×10.5L·mol^-1·cm^-1.Beer′s law was obeyed in the range of 0—2μg/10mL with a relative standard deviation of 3.8%.The method was applied satisfactorily to the determination of platinum contained in catalysts without separation.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1998年第4期492-495,共4页
Spectroscopy and Spectral Analysis
关键词
铂
四溴荧光素
罗丹明6G
浮选光度法
测定
Platinum, Tetrabromofluorescein, Rhodamine 6G, Flotation spectrophotometry
