Acta Chimica Sinica ›› 1996, Vol. 54 ›› Issue (4): 403-407. Previous Articles     Next Articles

Original Articles

胶束介质在速差动力学分析中的应用: 钴、镍的同时测定

缪吉根;蔡汝秀;曾云鹗   

  1. 浙江师范大学化学系;武汉大学化学系
  • 出版日期:1996-04-15 发布日期:1996-04-15

The application of micellar media in rate differential kinetics analysis: Simultaneous determination of cobalt and nickel

MIAO JIGEN;CAI RUXIU;ZENG YUNE   

  • Online:1996-04-15 Published:1996-04-15

The effect of micellar media (cetyltrimethylammonium bromide) for complex formation reaction of cobalt and nickel ions with xylenol orange (XO) has been investigated. The order of reaction and the apparent activation energy have been determined. The sensitivity of ternary complex of cobalt(Ⅱ) and nickel(Ⅱ) are 4.4 and 8.6 times bigger than binary complex. In the meantime, the difference of the reaction rate of two complex was increased and the selectivity of reaction was improved obviously. A new analytical method hased on the reaction rate difference of two ternary complex, for simultaneous determination of cobalt(Ⅱ) and nickel(Ⅱ) was developed, the logarithmic extrapolation method with computer was used to calculate. This method has been applied to simultaneous determination of cobalt and nickel in samples with satisfactory results. The relative error for determinations of two components was within 4% and the relative standard deviation was within 3%.

Key words: COBALT, NICKEL, XYLENOL ORANGE, SIMULTANEOUS DETERMINATIONS, COMPLEX REACTION, RATE DIFFERENTIAL KINETICS

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