Long-term crude oil exploitation has led to soil deterioration in Shengli Oilfield. Knowledge about accumulation and speciation of heavy metals in oil-polluted soil is the key to clear understanding of soil quality issue at this region. We analyze the speciation and content of 4 heavy metals( Zn,Pb,Cd and Ni) through modified BCR and DTPA extraction methods,taking the soil of Gudao oil region as an example. Results reveal that Zn and Cd have higher activity and bioavailability in the soil,so potential pollu...
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