2种甲氧基丙烯酸酯类杀菌剂在土壤中的降解吸附特性及对地下水的影响

发布时间：2018-04-19 17:36

本文选题：甲氧基丙烯酸酯类杀菌剂 + 土壤　；参考：《生态与农村环境学报》2017年05期

【摘要】：采用室内模拟试验,以江西红壤、东北黑土和太湖水稻土为代表性土壤,研究了啶氧菌酯和肟菌酯在土壤中的降解、吸附特性,并利用地下水污染指数(GUS)分析了其对地下水污染的影响。结果表明,杀菌剂的降解速率因含有的官能团不同而差异较大,常温、好氧条件下,啶氧菌酯在江西红壤和东北黑土中为较难降解性,在太湖水稻土中为难降解性,肟菌酯在上述3种土壤中均为易降解性;常温、积水厌气条件下,啶氧菌酯在江西红壤、太湖水稻土和东北黑土中均为中等降解性,肟菌酯在3种土壤中均为易降解性。积水厌气条件有利于啶氧菌酯和肟菌酯的降解,厌氧微生物是影响甲氧基丙烯酸酯类杀菌剂降解的重要因素。啶氧菌酯在江西红壤、东北黑土和太湖水稻土中的吸附均较好地符合Freundlich吸附等温方程,土壤有机碳分配系数(Koc)分别为811、613和926,属较难吸附等级,土壤有机质含量是影响啶氧菌酯在土壤中吸附性能的主要因素。采用高效液相色谱法估算可知,肟菌酯Koc20 000,属易吸附等级。啶氧菌酯在3种土壤中的GUS值介于1.8~2.8,具有一定的淋溶性,对地下水具有一定的潜在污染风险;肟菌酯在3种土壤中的GUS值均1.8,不淋溶,对地下水的潜在污染风险较小。
[Abstract]:Using Jiangxi red soil, northeast black soil and paddy soil of Taihu Lake as representative soils, the degradation and adsorption characteristics of adrioxifen and oxime ester in the soil were studied.The influence of groundwater pollution on groundwater pollution was analyzed by using groundwater pollution index (Gus).The results showed that the degradation rate of fungicides varied greatly with different functional groups. Under normal temperature and aerobic conditions, the degradation rate of pyridine was difficult to degrade in Jiangxi red soil and northeast black soil, and difficult to degrade in Taihu paddy soil.Oxime ester was biodegradable in the above three soils and was moderately degradable in Jiangxi red soil, Taihu paddy soil and northeast black soil under the condition of room temperature and water anorexia, and oximoxime ester was easy to degrade in three kinds of soils.Anaerobic water condition is beneficial to the degradation of acidomycin and oxime ester, and anaerobic microorganisms are the important factors affecting the degradation of methoxy acrylate fungicides.The adsorption of adrioxifen in Jiangxi red soil, northeast black soil and Taihu paddy soil was in accordance with the Freundlich adsorption isotherm equation. The soil organic carbon partition coefficient was 811613 and 926, respectively.The content of soil organic matter is the main factor that affects the adsorption performance of adrioxifen in soil.High performance liquid chromatography (HPLC) was used to estimate the Koc20 000 of oxime ester, which was easy to be adsorbed.The GUS value of the three soils is between 1.8 and 2.8, which has a certain leaching solubility, and has a certain potential pollution risk to groundwater, while the GUS value of oximoxime ester in all three soils is 1.8, and the potential pollution risk to groundwater is small.
【作者单位】：环境保护部南京环境科学研究所;
【基金】：国家自然科学基金(21407055) 江苏省自然科学基金(BK20140115)
【分类号】：X592

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