title: Simultaneous preconcentration of polar and non-polar organophosphorus pesticides from water samples by using a new sorbent based on mesoporous silica.
abstract: A new mesoporous silica based on the sol-gel material cyanopropyltriethoxysilane (CNPrTEOS) was successfully synthesized by the hydrolysis and condensation of CNPrTEOS in the presence of ammonium solution as catalyst and methanol as solvent. It was used as a solid-phase extraction sorbent for the simultaneous extraction of three organophosphorus pesticides, namely, polar dicrotophos and non-polar diazinon and chlorpyrifos. Analysis was performed using high-performance liquid chromatography with UV detection. CNPrTEOS was characterized by FTIR spectroscopy, field-emission scanning electron microscopy and nitrogen gas adsorption. The surface area and average pore diameter of the optimum sol-gel CNPrTEOS are 379 m(2) /g and 4.7 nm (mesoporous), respectively. The proposed solid-phase extraction based on CNPrTEOS exhibited good linearity in the range of 0.8-100 μg/L, satisfactory precision (1.15-3.82%), high enrichment factor (800) and low limit of detection (0.072-0.091 μg/L). The limits of detection obtained using the proposed solid-phase extraction method are well below the maximum residue limit set by European Union and are also lower (13.6-48.5×) than that obtained by using a commercial CN-SPE cartridge (0.98-4.41 μg/L). The new mesoporous sol-gel CNPrTEOS showed promising alternative as SPE sorbent material for the simultaneous extraction of polar and non-polar organophosphorus pesticides.
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, UTM, Johor Bahru, Johor, Malaysia.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Soutoudehnia Korrani
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, UTM, Johor Bahru, Johor, Malaysia.|Separation Science and Technology Group, Frontier Materials Research Alliance, Universiti Teknologi Malaysia, UTM, Johor Bahru, Johor, Malaysia.
authors.forename: Wan Aini
authors.initials: WA
authors.lastname: Wan Ibrahim
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, UTM, Johor Bahru, Johor, Malaysia.
authors.forename: Hamid
authors.initials: H
authors.lastname: Rashidi Nodeh
authors.affiliation: Department of Pharmaceutical and Medicinal Chemistry, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki, Cairo, Egypt.
authors.forename: Hassan Y
authors.initials: HY
authors.lastname: Aboul-Enein
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, UTM, Johor Bahru, Johor, Malaysia.|Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, UTM, Johor Bahru, Johor, Malaysia.
authors.forename: Mohd Marsin
authors.initials: MM
authors.lastname: Sanagi
keywords: Cyanopropyltriethoxysilane; Liquid chromatography; Organophosphorus pesticides; Sol-gel processes; Solid-phase extraction