Field demonstration of reduction of lead availability in soil and cabbage (Brassica Chinensis L.) contaminated by mining tailings using phosphorus fertilizers.
A field demonstration of reduction of lead availability in a soil and cabbage (Brassica Chinensis L.) contaminated by mining tailings, located in Shaoxing, China was carried out to evaluate the effects of applications of phosphorus fertilizers on Pb fractionation and Pb phyto-availability in the soil. It was found that the addition of all three P fertilizers including single super phosphate (SSP), phosphate rock (PR), and calcium magnesium phosphate (CMP) significantly decreased the percentage of water-soluble and exchangeable (WE) soil Pb and then reduced the uptake of Pb, Cd, and Zn by the cabbage compared to the control (CK). The results showed that the level of 300 g P/m(2) soil was the most cost-effective application rate of P fertilizers for reducing Pb availability at the first stage of remediation, and that at this P level, the effect of WE fraction of Pb in the soil decreased by three phosphorus fertilizers followed the order: CMP (79%)>SSP (41%)>PR (23%); Effectiveness on the reduction of Pb uptake by cabbage was in the order: CMP (53%)>SSP (41%)>PR (30%). Therefore our field trial demonstrated that it was effective and feasible to reduce Pb availability in soil and cabbage contaminated by mining tailings using P fertilizers in China and PR would be a most cost-effective amendment.
Xie
Zheng-Miao
ZM
Institute for Soil and Water Resource and Environment, Zhejiang University, Hangzhou 310029, China. zhmxie@zju.edu.cn
Wang
Bi-Ling
BL
Sun
Ye-Fang
YF
Li
Jing
J
D001673:Biodegradation, Environmental / Q000187:drug effects; D001937:Brassica / Q000187:drug effects / Q000378:metabolism*; D005591:Chemical Fractionation / Q000379:methods; D005308:Fertilizers; D007220:Industrial Waste / Q000032:analysis* / Q000517:prevention & control; D007854:Lead / Q000032:analysis / Q000737:chemistry* / Q000493:pharmacokinetics*; D008906:Mining; D010710:Phosphates / Q000008:administration & dosage / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis* / Q000493:pharmacokinetics*
D005308:Fertilizers; D007220:Industrial Waste; D010710:Phosphates; D012989:Soil Pollutants; D007854:Lead