کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4413642 1307684 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adsorption studies of the herbicide simazine in agricultural soils of the Aconcagua valley, central Chile
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Adsorption studies of the herbicide simazine in agricultural soils of the Aconcagua valley, central Chile
چکیده انگلیسی

Simazine is a s-triazine herbicide that has been applied worldwide for agriculture. This herbicide is the second most commonly detected pesticide in surface and groundwater in the United States, Europe and Australia. In this study, simazine adsorption behaviour was studied in two agricultural soils of the Aconcagua valley, central Chile. The two studied soils were soil A (loam, 8.5% organic matter content) and soil B (clay-loam, 3.5% organic matter content). Three times higher simazine adsorption capacity was observed in soil A (68.03 mg kg−1) compared to soil B (22.03 mg kg−1). The simazine adsorption distribution coefficients (Kd) were 9.32 L kg−1 for soil A and 7.74 L kg−1 for soil B. The simazine adsorption enthalpy in soil A was −21.0 kJ mol−1 while in soil B the adsorption enthalpy value was −11.5 kJ mol−1. These results indicate that simazine adsorption process in these soils is exothermic, governing H bonds the adsorption process of simazine in both the loam and clay-loam soils. These results and the potentiometric profiles of both soils, suggest that simazine adsorption in soil A is mainly governed by simazine–organic matter interactions and in soil B by simazine–clay interactions. The understanding of simazine sorption–desorption processes is essential to determine the pesticide fate and availability in soil for pest control, biodegradation, runoff and leaching.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 74, Issue 11, March 2009, Pages 1544–1549
نویسندگان
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