Cd,Cu,Zn and Pb contents and forms in soils and rapeseeds around Wuhu Plant

Abstract

Abstract: The study showed that around Wuhu Plant,soil Cd,Zn and Pb mainly existed in Fe-Mn oxide form,and Cu in residual form,with the percentage of 31.81%,39.83%,53.79%,and 46.24%,respectively.Soil exchangeable Cd and Pb had a higher proportion (23.47% and 16.32%) than soil exchangeable Cu and Zn (3.14% and 0.54%).The correlations between soil heavy metals and their forms,as well as their transformation to available form were different.Different heavy metals had different accumulation trends in rapeseed and its hull.Cu easily accumulated in hull,while Cd,Zn and Pb had a higher accumulation in seed.The accumulation rate of heavy metals in rapeseed and hull was also different,being the highest for Cd.There was a significantly negative correlation (P<0.05) between the accumulation rate of heavy metals and their contents in soil.In rapeseed,Cd,Cu and Pb were mainly in sodium hydroxide form,with the percentage of 32.50%,22.94% and 34.69%,respectively,while Zn was mainly in EDTA form,with a percentage of 45.97.The existed forms of heavy metals in rapeseed probably affected their toxicity,but the toxicity to human food could not be inferred from this research,and needed to be studied further.There was a weak relation between heavy metals contents and their existed forms in rapeseed.

Key words: Form, Rapeseed, Toxicity

CLC Number:

X132

WANG Xingming, LIU Dengyi, TU Junfang, LI Zheng, WANG Youbao . Cd,Cu,Zn and Pb contents and forms in soils and rapeseeds around Wuhu Plant[J]. Chinese Journal of Applied Ecology, 2005, 16(10): 1924-1931.

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