PHOTOCHEMISTRY OF AQUEOUS IRON(III) POLYCARBOXYLATE COMPLEXES - ROLES IN THE CHEMISTRY OF ATMOSPHERIC AND SURFACE WATERS

被引：509

作者：

FAUST, BC ^{[1
]}

ZEPP, RG ^{[1
]}

机构：

[1] US EPA,ENVIRONM RES LAB,ATHENS,GA 30605

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1993年 / 27卷 / 12期

关键词：

D O I：

10.1021/es00048a032

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Photochemical redox reactions of Fe(III) complexes of polycarboxylates (e.g., citrate, malonate, oxalate) occur on time scales of minutes in sunlight and are potentially important sources of Fe(II), .O2-/HO2., H2O2, and .OH in atmospheric water drops and surface waters. Quantum yields for Fe(II) formation, determined from experiments and equilibrium speciation calculations, are (i) 0.28 for Fe(OH)(citrate)- at 436 nm, (ii) 0.027 for Fe(malonate)2- at 366 nm, and (iii) 1.0 for Fe(oxalate)2- and 0.6 for Fe(oxalate)3(3-) at 436 nm. Competitive reactions of O2 and Fe(III) with the polycarboxylate radicals and/or the carbon-centered radicals derived from decarboxylation, as well as the speciation of Fe(II) and Fe(III), affect the experimental quantum yields of Fe(II) formation.

引用

页码：2517 / 2522

页数：6

共 35 条

[1] EQUILIBRIUM STUDY OF IRON(II) AND MANGANESE(II) COMPLEXES WITH CITRATE ION IN AQUEOUS-SOLUTION - RELEVANCE TO COORDINATION OF CITRATE TO THE ACTIVE-SITE OF ACONITASE AND TO GASTRO-INTESTINAL ABSORPTION OF SOME ESSENTIAL METAL-IONS [J].