Determinationof some pesticides in real samples using nanostructured double layered hydroxides by solid phase microextraction methods
Subject Areas : The Application of Chemistry in Environment
Keywords: triazole, fungicides, microextraction, toxin, Nanostructured, double layered hydroxides, implanted, harbored,
Abstract :
In this project, the extraction of trace triazole family toxins were carried out using the nanostructured double layered hydroxides(LDHs) by generic frame[M2+1-xMx3+(OH)2 (Am-)x/m.nH2O].Triazoles are systemic broad spectrum fungicides with high chemical and photochemical stability, low biodegradability and with lifetimes of weeks or months.The intake test of these chemicals in animals have shown the symptoms such as decreased kidney weight, altered urinary bladder structure, acute effects on the central nervous systems,and liver disfunctions.The contaminated samples were chosen and the hazardous chemicals separated through the prevalent metods of liquid-liquid extraction. The multiple stage extraction techniques as liquid-liquid and liquid- solid take a lot of time and money and lab,s facilities. It, also, demands a considerable amounts of toxic organic solvents.For this reason,in last few decades , new methods of microextraction have been developed. In this study, a microextraction procedure was applied using a fiber of double layered hydroxide, implanted on nano particles of iron oxide (γ-Fe3O4,α-LDH), for the extraction and identification of toxics(triazoles).The shape, size,properties and selection of the metal or girth for loading the above mentioned materials, are determining factor for the extraction of the trace pollutants.It, also , has been shown that since toxic triazoles having the negatively charged sites, they can be trapped in vacant socket layers of LDHs. Eventually, they can be released from these harbored microlayers and transferred for extraction processes.
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