铁铝复合氧化物对土壤Mn、Pb和Cd有效性的影响

Influence of Fe-Al Binary Oxide on the Availability of Soil Mn, Pb and Cd

利用氧化物对土壤重金属的吸附特性,研究了添加铁铝复合氧化物对土壤Mn、Pb和Cd有效性的影响。结果表明,在土壤中添加氧化物后,土壤中3种重金属的交换态含量明显降低。14天时间,添加铁铝氧化物后,土壤中交换态Mn、Pb和Cd的含量分别降低了64.8%、52.9%和89.51%,可见铁铝氧化物明显降低了土壤中Mn、Pb和Cd的有效性。通过方程拟合,建立了氧化物对土壤中交换态Mn、Pb和Cd的吸附模型,其中以Elovich方程和权函数方程拟合度较好,其次是抛物线扩散方程。

Abatract: This study examines effect of Fe-Al binary oxide on the adsorption of Mn, Pb and Cd in soil. The results show that after the oxides were added to soil, Mn, Pb and Cd contents noticeably decreased. 14 days after Fe-Al binary oxide was added, the Mn, Pb and Cd content in the soil decreased by 64.8%, 52.9% and 89.51%, respectively, indicating that Fe-Al binary oxide is an effective adsorbent for Mn, Pb and Cd in soil. The fitting equation is established on the adsorption effect of Fe-Al binary oxide on Mn, Pb and Cd in soil. The Elovich equation and the functional equation fit better, followed by the parabolic diffusion equation.