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Effects of paper sludge addition on the bioavailability and distribution of Pb in contaminated soil

机译：造纸污泥的添加对污染土壤中铅的生物利用度和分布的影响

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摘要

Heavy metal contamination of soil poses risks and hazards to environment and human being. Many amendments were used to remediate the contaminated soil. In this report, paper sludge was used to reduce the bioavailability of Pb in soil, and the remediation mechanism was studied by investigating the redistribution of Pb speciation after paper sludge addition. In pot experiments, significantly increased weights of shoots (from 1.6 to 3.3?mg per plant) and roots (from 0.7 to 0.8?mg per plant), as well as significantly decreased Pb content in shoots (from 153.8 to 24.4?mg?kg~(?1)) and roots (from 467.1 to 38.0?mg?kg~(?1)) of rape were observed after paper sludge was added. The addition of paper sludge resulted in redistribution of Pb from the liable fractions (carbonate-bound Pb from 58.3 to 3.7%) to the Fe–Mn oxide-bound fraction (from 29.2 to 74.9%). Paper sludge addition increased the content of organic matters and pH of soil, and induced Pb redistribution, which ultimately inhibited Pb uptake and improved plant growth.
机译：土壤的重金属污染对环境和人类构成风险和危害。许多修正案被用来修复被污染的土壤。在本报告中，使用纸质污泥来降低土壤中Pb的生物利用度，并通过研究添加纸质污泥后Pb形态的重新分布来研究修复机理。在盆栽实验中，芽的重量（从每株植物1.6到3.3？mg）和根（从0.7到0.8？mg每株）显着增加，芽中的Pb含量显着降低（从153.8到24.4？mg？kg）添加纸污泥后观察到油菜的〜（？1））和根（从467.1到38.0？mg？kg〜（？1））。纸污泥的添加导致铅从有效馏分（碳酸盐结合的铅从58.3％降低到3.7％）重新分配到铁锰氧化物结合的部分（从29.2％到74.9％）。造纸污泥的添加增加了有机物的含量和土壤的pH值，并导致了Pb的重新分布，最终抑制了Pb的吸收并改善了植物的生长。

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