Abstract:Pot experiment was conducted to investigate the effects of sepiolite on stabilization remediation of Cd contaminated soils in wastewater irrigation region and soil environmental quality. Results showed that the addition of sepiolite significantly decreased the concentration of TCLP-Cd in soil, the ratio of Cd exchangeable fraction reduced by 0.8%~3.8% when compared with the control, while the percentage of residual form of Cd increased by 0.5%~9.8%. However, the treatments of sepiolite significantly increased the biomass of spinach, resulting in 0.94~2.11 times increase for shoot biomass and 1.63~5.21 times increase for root biomass, respectively, in contrast to the control group. The activities of catalase, urease and invertase after applying sepiolite increased by 5.1%~15.4%, 14.2%~28.8% and 23.5%~34.0%. And the amount of bacteria and fungi enhanced by 15.5%~91.7% and 45.6%~96.5%, respectively. The concentration of Cd in the shoots and roots and Cd bioaccumulation and translocation factors of spinach decreased with increasing of sepiolite, suffering by 19.9%~45.6% and 51.2%~70.2% reduction, respectively. when compared to CK. The Cd content in the editable parts of spinach met with the national standard of hygiene quality for vegetable (GB 2762-2005) when the treatment of sepiolite was up to 5%.
孙约兵, 徐应明, 史新, 王林, 林大松, 梁学峰. 污灌区镉污染土壤钝化修复及其生态效应研究[J]. 中国环境科学, 2012, 32(8): 1467-1473.
SUN Yue-Bing, XU Ying-Ming, SHI Xin, WANG Lin, LIN Da-Song, LIANG Xue-Feng. The immobilization remediation of Cd contaminated soils in wastewater irrigation region and its ecological effects. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(8): 1467-1473.