Department of Chemistry, Faculty of Sciences, Hakim Sabzevari University, Sabzevar, 9617976487, Iran.
Mikrochim Acta. 2018 Feb 14;185(3):176. doi: 10.1007/s00604-018-2713-x.
The authors describe a method for the extraction of organophosphorus pesticides (OPPs) by using a magnetically separable sorbent consisting of a polyoxometalate of type BeWO supported on imidazole functionalized silica-coated cobalt ferrite. The sorbent was characterized by X-ray powder diffraction, field-emission scanning electron micrographs, vibrating sample magnetometry and FT-IR. The effects of the amount of adsorbent, pH value, salt concentration, extraction time, desorption solvent nature and volume and desorption time were investigated. Under optimal conditions, the method resulted in the following figures of merit: (a) the linear parts of the calibration plots typically extend from 0.08 to 300 μg mL of OPPs; (b) detection limits are between 0.02 to 0.06 ng mL; and (c), extraction recoveries from spiked samples vary from 70.0 to 89.2%, with relative standard deviations between 5.4 and 7.6%. The nanocomposites can be reused up to 10 times. Compared to other methods for pretreatment and preconcentration of OPPs, the new method is more rapid, sensitive, accurate and eco-friendly. The method was successfully applied to the determination of the OPP residues in water samples and fruit juices. Graphical Abstract Schmatic presenation of the synthesis of core-shell magnetic nanoparticles (MNPs) of the type BeW12O40-ILSCCFNPs, and their application as sorbent for magnetic solid-phase extraction (MSPE) of organophosphorus pesticides.
作者描述了一种使用由咪唑功能化硅涂层的钴铁氧体负载的多金属氧酸盐 BeWO 组成的可分离磁性吸附剂提取有机磷农药（OPPs）的方法。通过 X 射线粉末衍射、场发射扫描电子显微镜、振动样品磁强计和 FT-IR 对吸附剂进行了表征。考察了吸附剂用量、pH 值、盐浓度、萃取时间、解吸溶剂种类和体积、解吸时间的影响。在最佳条件下，该方法具有以下优点：（a）OPPs 的校准曲线线性部分通常从 0.08 到 300μg mL；（b）检测限在 0.02 到 0.06ng mL 之间；（c）从加标样品中提取的回收率为 70.0%到 89.2%，相对标准偏差在 5.4%到 7.6%之间。纳米复合材料可重复使用 10 次以上。与其他预处理和浓缩 OPPs 的方法相比，新方法更快速、灵敏、准确且环保。该方法成功应用于水样和果汁中 OPP 残留的测定。示意图展示了 BeW12O40-ILSCCFNPs 核壳型磁性纳米粒子（MNPs）的合成及其作为有机磷农药磁性固相萃取（MSPE）吸附剂的应用。
