PHOTOMETRIC-DETERMINATION OF ACIDITY CONSTANTS BY THE FLOW GRADIENT TECHNIQUE WITHOUT PH MEASUREMENTS

被引：22

作者：

MARCOS, J ^{[1
]}

RIOS, A ^{[1
]}

VALCARCEL, M ^{[1
]}

机构：

[1] UNIV CORDOBA,FAC SCI,DEPT ANALYT CHEM,CORDOBA,SPAIN

来源：

ANALYTICAL CHEMISTRY | 1990年 / 62卷 / 20期

关键词：

D O I：

10.1021/ac00219a016

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A simple photometric method for the determination of acidity constants without pH measurements is proposed. It Is based on the establishment of a pH gradient In a flow system which is created by means of a flow gradient. The proposed method thus avoids other less accurate procedures for the establishment of pH gradients. Large pH gradients can be maintained over long periods. The acidity constants of various compounds were determined automatically from different parameters of the absorbance-time recordings. The proposed method allows more than one acidity constant for the same compound to be determined. The accuracy of the method is between 0.9% and 5.3%, in terms of relative standard deviation, and ±0.1 and ±0.4 In terms of confidence intervals. © 1990, American Chemical Society. All rights reserved.

引用

页码：2237 / 2241

页数：5

共 13 条

[1] CONSTRUCTION OF PH GRADIENTS IN FLOW-INJECTION ANALYSIS AND THEIR POTENTIAL USE FOR MULTIELEMENT ANALYSIS IN A SINGLE SAMPLE BOLUS [J].