AUTOMATED, HIGH-PRECISION COULOMETRIC TITRIMETRY .2. STRONG AND WEAK ACIDS AND BASES

被引：19

作者：

PRATT, KW

机构：

[1] Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg

来源：

ANALYTICA CHIMICA ACTA | 1994年 / 289卷 / 02期

关键词：

COULOMETRY; AUTOMATED ANALYSIS; ACIDIMETRY; HIGH-PRECISION ASSAY;

D O I：

10.1016/0003-2670(94)80096-0

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Automated constant-current coulometric acidimetry, based on Faraday's Laws, is uncertain to less than 1 part in 20000 (relative standard deviation) and requires no chemical standardization. It is applicable to strong and weak acids and bases, with bases back-titrated after addition of excess strong acid. Initial setup and sample introduction are the sole manual steps. Assays of HCl, benzoic acid, Na2CO3, and tris(hydroxymethyl)aminomethane are presented. In the endpoint determination procedure, a generalized titration equation yields the theoretical charge remaining to the endpoint before each charge addition. The ratio of the experimental to the theoretical charge for the preceding aliquot corrects for experimental deviations.

引用

页码：135 / 142

页数：8

共 13 条

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