噻呋酰胺在土壤中的降解、吸附-解吸及移动特性研究

发布时间：2018-04-05 10:56

本文选题：噻呋酰胺　切入点：土壤　出处：《生态环境学报》2016年11期

【摘要】：研究噻呋酰胺在土壤中的降解、吸附-解吸及移动特性,有利于评价噻呋酰胺在土壤环境中的持效性,可为其安全使用及对水资源的风险性评价提供理论依据。采用室内模拟方法研究了不同土壤类型、土壤含水量、土壤微生物和有机质含量对噻呋酰胺在土壤中降解的影响以及噻呋酰胺在土壤中的吸附、解吸及移动特性。结果表明,噻呋酰胺在3种土壤中均属于易降解,噻呋酰胺在南京黄棕壤、东北黑土、江西红壤中的降解半衰期分别为9.4、17.8、20.1 d。随着土壤湿度增加,噻呋酰胺的降解速率加快,当土壤湿度为饱和含水量80%时,微生物生长将受到抑制,降解速率减慢。土壤中微生物和有机质能加快噻呋酰胺降解,在微生物和有机质存在的条件下噻呋酰胺降解速率分别提高2.7倍和17.2倍。噻呋酰胺在3种土壤中的吸附能力为东北黑土南京黄棕壤江西红壤,吸附能力越强,解吸附能力越弱;土壤有机质含量、阳离子代换量和粘粒含量与吸附系数具有良好的相关性。噻呋酰胺在土壤中的吸附自由能在-22.70~-21.30 k J·mol-1之间,属于物理吸附。薄层层析研究表明,噻呋酰胺在江西红壤、南京黄棕壤、东北黑土中的Rf值分别为0.234、0.233、0.224,均属于不易移动。土柱淋溶试验结果表明,噻呋酰胺在3种土壤中均属于难淋溶,不易通过淋溶作用对地下水造成污染。
[Abstract]:Study on degradation of thifluzamide in soil, adsorption desorption and mobility characteristics, is conducive to the persistence in soil environment evaluation thifluzamide, can provide a theoretical basis for the safety and risk assessment of water resources. The effects of different soil types of indoor simulation method, the soil moisture. The adsorption effect of soil microorganisms and organic matter content on degradation of thifluzamide in soil and thifluzamide in soil, desorption and moving characteristics. The results show that the thifluzamide in the 3 soils are easy to degrade, thifluzamide in Nanjing yellow brown soil and black soil in Northeast China, the degradation half-life in the red soil of Jiangxi were 9.4,17.8,20.1 D. with soil moisture increasing, the degradation rate of thifluzamide accelerated, when the soil humidity is saturated with 80% water content, microbial growth will be inhibited, the degradation rate slowed down. Microbial and organic matter in soil To speed up the thifluzamide degradation in the presence of microorganisms and organic matter degradation rate under the condition of thifluzamide are increased by 2.7 times and 17.2 times. Thifluzamide in 3 kinds of soil adsorption capacity for black soil in Northeast China Nanjing yellow brown soil of Jiangxi red soil, the adsorption capacity is higher, the solution adsorption capacity is weak; the contents of soil organic matter. CEC and clay content and adsorption coefficient has good correlation. Thifluzamide free adsorption in the soil between the -22.70~-21.30 K J mol-1, belongs to physical adsorption. The TLC study showed that thifluzamide in Jiangxi Nanjing red soil, yellow brown soil, black soil in Northeast China Rf = 0.234,0.233,0.224, belong to it is not easy to move. The soil column leaching test results show that thifluzamide in 3 soils were difficult to be leached, easy through leaching of groundwater pollution.

【作者单位】：南京农业大学植物保护学院;江苏省绿盾植保农药实验有限公司;
【基金】：国家公益性行业(农业)科研专项经费项目(201203022) 江苏省研究生工作站项目
【分类号】：X131.3

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