Impact of low molecular weight organic acids and dissolved organic matter on sorption and mobility of isoproturon in two soils.
Impact of low molecular weight organic acids and dissolved organic matter on sorption and mobility of isoproturon in two soils.
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DOI：
10.1016/j.jhazmat.2011.04.003
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发表时间：
2011-06
影响因子：
13.6
通讯作者：
Qing Ding;H. Wu;Yun Xu;Li Guo;Kaiming Liu;Hui Gao;Hong Yang
中科院分区：
文献类型：
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作者：
Qing Ding;H. Wu;Yun Xu;Li Guo;Kaiming Liu;Hui Gao;Hong Yang
异丙隆是苯脲家族的一种选择性除草剂，广泛用于一年生杂草的出苗前和出苗后的防除。土壤改良剂(例如有机化合物或溶解有机物)可能会影响农药的环境行为和生物利用度。然而，异丙隆在土壤中的物理化学过程是否受到有机改良剂的影响，以及在不同类型的土壤中是如何影响的，目前尚不清楚。为了评价低分子量有机酸(LMWOA)和溶解有机质(DOM)对异丙隆在土壤中的吸附/解吸和移动性的影响，对两种不同的土壤类型(潮土和潮土)进行了综合分析。我们的分析表明，DOM和LMWOA的存在抑制了异丙隆在软土中的吸附，促进了异丙隆的解吸和迁移。然而，在Hap udic菊花土中观察到了相反的结果，这表明土壤类型主要影响物理化学过程。我们还利用三维激发发射矩阵(EEM)荧光光谱和傅立叶变换红外光谱(FT-IR)对土壤的不同成分进行了表征，表明两种土壤对几个官能团的吸收带强度不同。
Isoproturon is a selective herbicide belonging to the phenylurea family and widely used for pre- and post-emergence control of annual weeds. Soil amendments (e.g. organic compounds or dissolved organic matter) may affect environmental behavior and bioavailability of pesticides. However, whether the physiochemical process of isoproturon in soils is affected by organic amendments and how it is affected in different soil types are unknown. To evaluate the impact of low molecular weight organic acids (LMWOA) and dissolved organic matter (DOM) on sorption/desorption and mobility of isoproturon in soils, comprehensive analyses were performed using two distinct soil types (Eutric gleysols and Hap udic cambisols). Our analysis revealed that adsorption of isoproturon in Eutric gleysols was depressed, and desorption and mobility of isoproturon were promoted in the presence of DOM and LMWOA. However, the opposite result was observed with Hap udic cambisols, suggesting that the soil type affected predominantly the physiochemical process. We also characterized differential components of the soils using three-dimensional excitation–emission matrix (EEM) fluorescence spectroscopy and Fourier transform infrared (FT-IR) spectroscopy and show that the two soils displayed different intensity of absorption bands for several functional groups.