کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4415583 | 1307752 | 2007 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of chelating agents and solubility of cadmium complexes on uptake from soil by Brassica juncea Effect of chelating agents and solubility of cadmium complexes on uptake from soil by Brassica juncea](/preview/png/4415583.png)
Brassica juncea, or Indian mustard, was grown in soil artificially contaminated with either a soluble salt, CdCl2, at 186 mg Cd kg−1, or alternately an insoluble, basic salt, CdCO3, at 90 mg Cd kg−1. These experiments study the range of Cd uptake by Indian mustard from conditions of very high Cd concentration in a soluble form to the other extreme with an insoluble Cd salt. After plants were established, four different chelating agents were applied. Chelating agents increased plant uptake of Cd from the CdCl2 soil but did not significantly increase plant uptake of Cd from the CdCO3 contaminated soil. Addition of ethylenediaminetetraacetic acid (EDTA) increased the plant concentration of Cd by almost 10-fold in soils contaminated with CdCl2, with a concentration of 1283 mg Cd kg−1 in the dried EDTA-treated plants over a concentration of 131 mg Cd kg−1 in plants without added chelate. However, EDTA increased the aqueous solubility of Cd by 36 times over the soil matrix without added chelator, and thereby, increased the possibility of leaching. Other chelators used in both experiments were ethylenebis(oxyethylenenitrilo)tetraacetic acid, trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid, and diethylenetriaminepentaacetic acid (DTPA) increasing Cd in plants to 1240, 962, and 437 mg Cd kg−1, respectively. The other chelating agents increased the solubility of Cd in the leachate but not to the extent of EDTA. Comparing all chelating agents studied, DTPA increased plant uptake in terms of Cd in dried plant concentration most relative to the solubility of complexed Cd in runoff water.
Journal: Chemosphere - Volume 68, Issue 3, June 2007, Pages 401–408