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Study on detoxication of organic acid to raddish under the stress of Pb and Cd

CHEN Yingxu, LIN Qi, LU Fang, HE Yunfeng \ (Department of Environmental Science, Zhejiang University, Huajiachi, Hangzhou,310029)  
Effect of organic acid on raddish under the stress of Pb and Cd was studied using hydroponic experiment. The results showed that the detoxication of citrate acid to Pb and tartaric acid to Cd was comparatively distinct. The former was probably due to improvement of transfer from roots to shoots and the latter, diversely, to inhibition of transfer from roots to shoots, thus decreased the accumulation of Cd in shoots. With the studies of heavy metal forms using sequential extraction, it showed that in the roots of raddish, less activable HAc extractable\|Pb was dominant and HCl, NaCl extractable\|Pb followed. In the shoots, however, HCl extractable\|Pb was dominant and NaCl extractable\|Pb followed. Treatment of organic acid had no effect on dominant sequence of different Pb forms, but it caused the variance of concentration or percent of different Pb forms. In the shoots with citrate acid treatment, percent of less activable HCl extractable\|Pb in creased and relatively higher activable alcohol, water, NaCl extractable\|Pb decreased. As for Cd, NaCl extractable\|Cd was dominant in both roots and shoots of raddish, Treatment of organic acid also had no effect on dominant sequence of different Cd forms. Compared with check, NaCl extractable\|Cd decreased in tartaric acid treatment.
【Fund】: 国家自然科学基金!(2 97770 2 0 );; 浙江省自然科学基金! (2 970 32 )
【CateGory Index】: X13
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