Iron(III)-Complexes Engaged in the Biochemical Processes in Seawater. II. Voltammetry of Fe(III)-Malate Complexes in Model Aqueous Solution

被引：19

作者：

Vukosav, Petra ^{[1
]}

Tomisic, Vladislav ^{[2
]}

Mlakar, Marina ^{[1
]}

机构：

[1] Rudjer Boskovic Inst, Dept Marine & Environm Res, Zagreb 10000, Croatia

[2] Univ Zagreb, Fac Sci, Phys Chem Lab, Zagreb 10000, Croatia

来源：

ELECTROANALYSIS | 2010年 / 22卷 / 19期

关键词：

Iron(III); Malic acid; Voltammetry; Iron(III)-malate complexes; UV-Vis spectrophotometry; SQUARE-WAVE VOLTAMMETRY; MARINE-BACTERIA; WATER SOLUTION; IRON; SIDEROPHORES; IRON(III); MALATE; STABILITY; LACTATE; ACIDS;

D O I：

10.1002/elan.200900632

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Characteristics of iron(III) complexes with malic acid in 0.55 mol L(-1) NaCl were investigated by voltammetric techniques. Three iron(III)-malate redox processes were detected in the pH range from 4.5 to 11: first one at -0.11 V, second at -0.35 V and third at -0.60 V. First process was reversible, so stability constants of iron(III) and iron(II) complexes were calculated: log K(1)(Fe(III)(mal)) = 12.66 +/- 0.33, log beta(2)(Fe(III)(mal)(2)) = 15.21 +/- 0.25, log K(1)(Fe(II)(mal)) = 2.25 +/- 0.36, and log beta(2)(Fe(II)(mal)(2)) = 3.18 +/- 0.32. In the case of second and third reduction process, conditional cumulative stability constants of the involved complexes were determined using the competition method: log beta(Fe(mal)(2)(OH)(x)) = 15.28 +/- 0.10 and log beta(Fe(mal)(2)(OH)(y)) = 27.20 +/- 0.09.

引用

页码：2179 / 2186

页数：8

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