【作者】 吴双桃； 陈少瑾； 胡劲召； 谢凝子； 陈宜菲；

【Author】 Shuangtao Wu, Shaojin Chen, Jingzhao Hu, Ningzi Xie and Yifei Chen(Research Institute of Environmental Chemistry and Technology, Hanshan Teachers College, Chaozhou, 521041, Guangdong Province, CHINA)

【机构】 韩山师范学院环境化学应用技术研究所；

【摘要】 本项目应用气相色谱-质谱联用仪(GC-MS)对零价铁在常温常压(25℃和1大气压)下加速土壤中芳香族硝基化合物的降解进行了研究。运用零价铁还原法对三种土壤中对硝基甲苯和间二硝基苯进行处理,可使芳香族硝化物转化为苯胺,有效地降低毒性。GC-MS检测结果表明,零价铁对对硝基甲苯和间二硝基苯的还原降解率最高分别达到91%和90%。另外,不同土壤与硝基化合物的降解率有密切关系,降解率表现出粘土>轻壤土>砂土的规律。主要探讨了以下几个土壤理化性质对降解的影响:一定范围内中性偏酸的pH值有利于降解,土壤微生物的存在有益于降解,降解率随土壤有机质含量升高而增高。更多还原

【Abstract】 The enhanced soil degradation of p-nitrotoluene and m-dinitrobenzene with zero-valent iron (ZVI) was studied in the laboratory at ambient temperature and pressure using gas chromatography-mass spectrometry (GC-MS). GC-MS analysis of the soil samples indicated the transformation of original nitro compounds to aromatic amines, effectively decreasing their toxicity. The the rates of degradation reached as high as 91% and 90% for p-nitrotoluene and m-dinitrobenzene, respectively. In addition, there was a close correlation between the degradation rate and the physical chemical properties of soils. Regarding the degradation rates and the soil textures, lab experiments showed the following trend: clay > sandy loam > sand. Preliminary data also revealed that acidic to neutral pH was more favorable to the degradation, and the existence of active soil microbes promoted fast degradation. Another trend was that the higher the soil organic matter contents, the higher the degradation rate.更多还原