THE IONIZATION-CONSTANTS OF ALPHA-ALANINE IN NACL AT 25-DEGREES - EFFECT OF THE IONIC-STRENGTH BASED ON 3 MODELS

被引：21
作者：
FIOL, S [1 ]
BRANDARIZ, I [1 ]
DEVICENTE, MS [1 ]
机构：
[1] UNIV LA CORUNA,FAC CIENCIAS,DEPT QUIM FUNDAMENTAL & IND,E-15071 LA CORUNA,SPAIN
来源：
TALANTA | 1995年 / 42卷 / 06期
关键词：
D O I：
10.1016/0039-9140(95)01484-S
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
In the present work we obtained the experimental pKs of the amino acid alpha-alanine in NaCl at 25 degrees and different ionic strengths. The equilibrium constants have been potentiometrically determined with a commerical glass electrode and the results analysed through three models: two directly based on the Fitter and Scatchard approaches to the ion specific interaction theory and the other based on a simpler modification of the Debye-Huckel equation. The three models fit the data reasonably well and the extrapolated pK values obtained show a good agreement. The goodness of the ridge regression method cannot be probed in this case.
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页码：797 / 801
页数：5
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