Ferric borate formation in aqueous solution

被引：6

作者：

Byrne, RH

Thompson, SW

机构：

[1] Marine Science Department, University of South Florida, St. Petersburg

来源：

JOURNAL OF SOLUTION CHEMISTRY | 1997年 / 26卷 / 07期

基金：

美国国家科学基金会;

关键词：

complexation; ferric borate; hydrolysis; iron(III); boric acid; potentiometry;

D O I：

10.1007/BF02767624

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Potentiometric analyses indicate that previous investigations have overestimated the stability of ferric borate complexes. The FeB(OH)(4)(2+) formation constant result obtained in the present work is (B) beta(1)* = [FeB(OH)(4)(2+)][H+][Fe3+](-1)[B(OH)(3)](-1) = (5.4+/-0.3)x10(-3) at 25.0 degrees C and 0.7 molal ionic strength. Our result indicates that solution concentrations of FeOH2+ and FeB(OH)(4)(2+) are approximately equal in aqueous solution for boric acid concentrations on the order of 0.3 molal. Fe(B(OH)(4))(2)(+) is a minor species in solution compared to FeB(OH)(4)(2+) for conditions such that [B(OH)(3)][H+](-1) less than or equal to 350, and ferric borate complexation is insignificant in solutions such as seawater where [B(OH)(3)] less than or equal to 4x10(-4) molal.

引用

页码：729 / 734

页数：6