Cadmium and chromium removal kinetics from solution by two aquatic macrophytes

被引：87

作者：

Sune, N. ^{[1
]}

Sanchez, G. ^{[1
]}

Caffaratti, S. ^{[1
]}

Maine, M. A. ^{[1
]}

机构：

[1] UNL, CONICET, Fac Ingn Quim, RA-3000 Santa Fe, Argentina

来源：

ENVIRONMENTAL POLLUTION | 2007年 / 145卷 / 02期

关键词：

metal; Salvinia herzogii; Pistia stratiotes; kinetics; water;

D O I：

10.1016/j.envpol.2006.04.016

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The aim of this work was to determine chromium and cadmium bioaccumulation processes of two free-floating macrophytes commonly used in wetlands for water treatment: Salvinia herzogii and Pistia stratiotes. Metal removal from the solution involves two stages: a fast one and a slow one. The fast stage of the Cd uptake is significantly different for each species, while it is not significantly different in Cr uptake. The most important processes of Cd uptake are biological ones in S. herzogii and adsorption, chelation and ionic exchange are in P. stratiotes. The main processes of Cr uptake in both macrophytes are adsorption, chelation and ion exchange. The slow stage is different for each species and metal. Cr precipitation induced by roots occurs in P. stratiotes. Cr uptake through leaves is probably the main cause of the increase of Cr in the aerial parts of S. herzogii. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：467 / 473

页数：7

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