Effect of Anions in Simulated Precipitation on the Uptake of Heavy Metals and Aluminum by Brassica Rapa L. Grown in Heavy -Metal -Contaminated Sandy Soil |
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| Authors: | T Ohtani N Uematsu S Yashima M Fukami |
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| Institution: | 1. Faculty of Agriculture, Utsunomiya University, 350 Mine-Machi, Utsunomiya, Tochigi, 321-8505, Japan
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| Abstract: | This study investigated the effect of anions on the uptake of heavy metals and aluminum by Brassica rapa L. from non-contaminated, Cd-contaminated, and sewage sludge compost (SSC)-amended sandy soil. Four types of artificial precipitation were applied: deionized water (pH 5.7) as a control, and solutions of HNO3, H2SO4, and HCl prepared to pH 4.5. Precipitation was applied daily during the last 20 d of cultivation. The pH of the Cd-treated soil after harvest was not affected by any precipitation treatment. Shoot concentrations of heavy metals and Al were unaffected by any treatments on non-contaminated soil. In contrast, all acid treatments increased the Cd concentration in shoots grown on Cd-contaminated soil, but only HNO3 precipitation increased it in SSC-amended soil. These results indicate, even without large soil pH change, there is a possibility that the Cd uptake by B. rapa L. depends on anions in precipitation and chemical form of Cd in the soil under conditions of heavy metal enrichment. |
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