NONREVERSIBLE ADSORPTION OF DIVALENT METAL-IONS (MN-II, CO-II NI-II CU-II AND PB-II) ONTO GOETHITE - EFFECTS OF ACIDIFICATION, FE-II ADDITION, AND PICOLINIC-ACID ADDITION

被引：206

作者：

COUGHLIN, BR ^{[1
]}

STONE, AT ^{[1
]}

机构：

[1] JOHNS HOPKINS UNIV, GWC WHITING SCH ENGN, DEPT GEOG & ENVIRONM ENGN, BALTIMORE, MD 21218 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1995年 / 29卷 / 09期

关键词：

D O I：

10.1021/es00009a042

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Differences in the coordination chemistry of divalent metal ions affect their adsorption onto goethite (alpha-FeOOH) surfaces and their subsequent release by acidification, Fe-II addition, and picolinic acid addition. Equilibrium constants for adsorption onto FeOOH (goethite) decrease in the order: Cu-II > Pb-II > Ni-II approximate to Co-II > Mn-II. Equilibrium constants for picolinic acid complexation follow the Irving-Williams series; complex formation with Pb-II and Mn-II is nearly negligible. Divalent metal ion release 24 h following acidification or picolinic acid addition is typically less than the amount predicted using an equilibrium speciation model, indicating adsorption/desorption hysteresis. Experiments performed under strict exclusion of O-2 reveal a slight increase in Co-II, Ni-II, and Cu-II adsorption upon the addition of 1000 mu M Fe-II. Fe-II interferes with the ability of picolinic acid to cause divalent metal ion release.

引用

页码：2445 / 2455

页数：11

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