Complexation of calcium by α-isosaccharinic acid under alkaline conditions

被引：42

作者：

Vercammen, K ^{[1
]}

Glaus, MA ^{[1
]}

Van Loon, LR ^{[1
]}

机构：

[1] Paul Scherrer Inst, Lab Waste Management, CH-5232 Villigen, Switzerland

来源：

ACTA CHEMICA SCANDINAVICA | 1999年 / 53卷 / 04期

关键词：

D O I：

10.3891/acta.chem.scand.53-0241

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The complexation of Ca2+ by alpha-isosaccharinic acid (alpha-ISA) was determined by measuring the solubility of Ca(alpha-ISA), as a function of pH. In the pH range between 12 and 12.8, the observed increase of the total concentration of Ca in solution with increasing pH is explained by the complexation reaction: Ca2+ + alpha-ISA(-) = Ca(alpha-ISA(-H))(0) + H+ with log K-CaISAo(o)=-10.4 (s=0.2) at I=0. In addition to this complexation reaction, another complex is postulated: Ca2+ + alpha-ISA(-) reversible arrow Ca(alpha-ISA)(+) with log K-CaISA+(o)=1.70. A value for the solubility product of Ca(B-ISA), is calculated: log K-sol(o)=-6.36 (s=0.1) at I=0.

引用

页码：241 / 246

页数：6

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