赤泥对污染土壤Pb、Zn化学形态和生物可给性的影响

通过土壤培养实验,研究添加赤泥对污染土壤中Pb、Zn化学形态和生物可给性的影响。结果表明,不同赤泥用量处理均可显著降低土壤中HOAc提取态Pb、Zn含量。当赤泥用量为5%时,培养1、2和3个月后,HOAc提取态Pb含量分别比对照下降62.5%、65.3%和73.5%;HOAc提取态Zn含量分别比对照下降56.7%、65.8%和67.4%。培养3个月后,只有1%赤泥用量处理显著降低了土壤中生物可给性Pb含量,而不同用量赤泥处理均显著降低了土壤中生物可给性Zn含量。研究表明赤泥是一种钝化污染土壤中Pb、Zn的潜力添加剂。

Effects of red mud addition on fractionation and bio-accessibility of Pb and Zn in contaminated soil

Effects of red mud addition on the fractionation and bio-accessibility of Pb and Zn in soil were studied by batch soil column incubation experiment. The results showed that all treatments with red mud addition could significantly decrease the concentrations of HOAc-soluble Pb and Zn. Compared with the control, the treatment with 5% red mud addition could significantly decrease the concentrations of HOAc soluble Pb and Zn after 1, 2 and 3 months incubation (62.5%, 65.3% and 73.5% decrease, 56.7%, 65.8% and 67.4% decrease, for Pb and Zn, respectively). After 3 months incubation, the treatment with 1% red mud addition significantly decreased the concentration of bio-accessible Pb, however, all treatments including 1%, 2% and 5% red mud addition, significantly decreased the concentration of bio-accessible Zn. The results highlighted the potential of red mud amendments to reduce Pb and Zn bioavailability in contaminated soil.