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
T. Ohtani et al., 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, WATER A S P, 130(1-4), 2001, pp. 751-756
This study investigated the effect of anions on the uptake of heavy metals
and aluminum by Brassica rapa L. from non-contaminated, Cd-contaminated, an
d sewage sludge compost (SSC)-amended sandy soil. Four types of artificial
precipitation were applied: deionized water (pH 5.7) as a control, and solu
tions 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 a
fter harvest was not affected by any precipitation treatment. Shoot concent
rations of heavy metals and Al were unaffected by any treatments on non-con
taminated soil. In contrast, all acid treatments increased the Cd concentra
tion in shoots grown on Cd-contaminated soil, but only HNO3 precipitation i
ncreased 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. de
pends on anions in precipitation and chemical form of Cd in the soil under
conditions of heavy metal enrichment.