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21.
The present study describes the application of different solid-phase extraction techniques for the extraction, separation, and quantitative determination of 10 commonly used herbicides with different chemical structures (chlorsulfuron, diuron, bentazone, linuron, chlorpropham, fenoxoprop-ethyl, MCPA, diclofop-methyl, fluazifop-butyl, trifluraline) in water. Octadecyl (C(18)) Empore extraction disks, octadecyl (C(18)), and stryene divinylbenzene (SDB) Bond Elut Env cartridges were compared for solid-phase extraction efficiency. Herbicides were separated and quantified by reversed-phase high performance liquid chromatography with diode-array detection (HPLC-DAD) with simultaneous separation on two columns of differing polarity (C(18) and CN) to confirm identification. Analytical separation was performed simultaneously on C(18) and CN columns. Reanalysis of the sample extracts on a (cyano) CN column were used to confirm the identity of these compounds. Method optimization and validation parameters were presented in this work. Recoveries varied from 76.0% to 99.0% for C(18) disks, from 75.1% to 100.0% for C(18) cartridges, and from 54.0% to 98.0% for SDB cartridges over concentrations at 0.025--0.4 microg L(-1). The limits of detection were 0.012--0.035 microg L(-1).  相似文献   
22.
This article offers a different perspective to the well known problems of water scarcity in the Middle East. It is argued that there are strong linkages between prevailing national ideologies and intraregional water disputes. Domestic political necessities and commitments often limit foreign policy choices open to countries with regard to the settlement of water disputes. This tends to exacerbate existing conflict. Reasons given include ideologically intertwined issues related to national security, including food security and national independence in conjunction with a deep socio-cultural commitment to a prospering agricultural sector. Any proposed solution to Middle East water disputes needs to take ideological-political factors into account in addition to the physical, social, cultural and economic aspects.  相似文献   
23.
Journal of Material Cycles and Waste Management - For the first time in the world, raw tea waste from tea plants was mineralized by rapid biotechnological methods using beneficial worms, enzymes...  相似文献   
24.
Journal of Polymers and the Environment - In this study, six different organo-hydrogel containing Agar-Glycerol (AG) based Coconut Oil (CnO) were synthesized using different crosslinkers to ensure...  相似文献   
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