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中国农学通报

中国农学通报 ›› 2008, Vol. 24 ›› Issue (10): 515-520.

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

光催化降解表土层中DDT的影响因素研究

潘淑颖,高宝玉,岳钦艳,辛佳,于洪艳,冯秀娟   

  • 收稿日期:2008-09-03 修回日期:2008-09-12 出版日期:2008-10-05 发布日期:2008-10-05

Effects of Various Factors on the Photocatalyic Degradation of DDT on Surface Layer of Soil

Pan Shu Ying   

  • Received:2008-09-03 Revised:2008-09-12 Online:2008-10-05 Published:2008-10-05

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摘要： 通过选用添加适量滴滴涕（DDT）的棕壤土，以紫外灯为光源进行光催化降解实验，研究土壤的水分含量、溶解性有机质（DOM）含量、pH值、不同的外源投加物质以及翻动土壤等各因素对于土壤中DDT光催化降解的影响，探讨光催化降解DDT的最优化条件。实验结果表明：随着水分含量的增加，DDT的降解率呈逐渐增大的趋势；当水分含量达50%时，DDT降解率达到最高，达67.5%；当水分含量超过50%后，DDT降解率呈缓慢下降趋势。在一定范围内，DDT的光催化降解率随溶解性有机质含量的增加而增加，但当溶解性有机质的含量超过1.0%时，降解率反而降低；和中性条件相比，DDT在酸性和碱性条件下都具有更高的光催化降解率；投加铁粉、Ti02对土壤中DDT的降解速率有明显的提高；溶解性有机质、Fe2O3、全元素肥料混合溶解性有机质对DDT的光催化降解效果略有提高，而单独加入全量元素肥料几乎对降解率没有影响；DDT的光催化降解率随着土层深度的增加而降低；定期翻动土壤可以有效提高DDT的光催化降解率。

关键词: 科技期刊, 科技期刊, 编辑学者化, 编辑素养

Abstract: In order to get the optimum conditions for photodegradation experiment, the effects of various factors, including soil pH, Dissolved Organic Matter（DOM）, water content, soil depth, exogenous components and husbandry on the degradation performance of 2,2-bis(4-Chlorophenyl)-1,1,1-trichloroethane （DDT） were studied by choosing the brown soil samples spiked with DDT and exposed to the UV-light irradiation. The results indicated that the degradation rate increases with the increasing of the water content of the soil, but when it exceeds over 50%, the degradation rate decreases. The photocatalytic degradation rate of DDT increases with the rising of the concentration of DOM, however, when the concentration of DOM exceeds over 1.0%, the degradation rate reduces slightly. Acidic or alkaline environment is more effective for the photodegradation than the neutral environment.Fe and TiO2 greatly accelerate the photodegradation of DDT in soil, DOM, Fe2O3 and all element fertilizer+DOM slightly positively influence the photodegradation, while the all element fertilizer scarcely provides contributions. The degradation rate of DDT decreases with the rise of the soil depth; regular husbandry can enhance the degradation capacity of DDT effectively.

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