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Adsorption of Diuron and Linuron in Gaza Soils

American Journal of Analytical Chemistry 2013年第7期4卷 94-99页

作者： Yasser El-Nahhal Mohamed Abadsa samir affifi Department of Earth and Environmental Sciences The Islamic University of Gaza Gaza Palestine

This study investigated the adsorption potential of diuron and linuron in selected soil samples collected from agricultural area of Gaza Strip, Palestine and correlated the adsorption results to the soil properties. The adsorption experiments are based on the batch equilibrium technique and UV-Spectrophotometer method to determine the equilibrium concentration of both herbicides. Results of adsorption experiment showed that linuron and diuron are adsorbed in various amounts in Gaza soils according to the variation in pH, organic matter and clay content. Adsorption isotherms of both herbicides were linear in the tested concentration. Fitting the adsorption data to Freundlich equation showed good fitting and Freundlich constants were less than one indicating physical adsorption processes. It is concluded that soil organic matter and pH affect the adsorption of both herbicides. These results provided a better understanding of the behavior of diuron and linuron in Gaza soils.

关键词： Adsorption Diuron Linurn Soil Gaza

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Leaching Potential of Diuron and Linuron in Gaza Soils

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American Journal of Plant Sciences 2014年第26期5卷 4040-4049页

作者： Yasser El-Nahhal Mohamed Abadsa samir affifi Department of Environment and Earth Sciences The Islamic University Palestinian National Authority (PNA) Gaza Palestine

This study investigated the leaching potential of diuron and linuron in different soil types in Gaza Strip, Palestine under laboratory and field conditions. Leaching potential was evaluated by tin columns and bioassay technique using Molokhia as test plant. The responses of the test plant were regressed versus concentrations of the herbicide to estimate linear regression equation and the regression coefficient. The obtained results indicate strong positive association between Molokhia and concentrations of diuron or linuron;accordingly it was used in the bioassay and estimation of the concentrations of the tested herbicides in the leaching depth. Leaching potential was very low in North Gaza and Kkan Younis soil, whereas in the Meddle zone soil was very large. Leaching potential under laboratory conditions was larger that under field conditions. The bioestimated concentrations in soil layer under field conditions were sever folds of magnitude lower than those under laboratory conditions. The interesting outcome of this study is that leaching potential is dependent on soil clay fraction, soil organic matter, and soil pH. These results provided answers to the questions raised by farmers in Gaza Strip.

关键词： Leaching Potential Diuron Linuron Clay Fraction Soil Organic Matter Soil pH

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