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首页> 外文期刊>Analytical methods >Montmorillonite/polyaniline/polyamide nanocomposite as a novel stir bar coating for sorptive extraction of organophosphorous pesticides in fruit juices and vegetables applying response surface methodology
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Montmorillonite/polyaniline/polyamide nanocomposite as a novel stir bar coating for sorptive extraction of organophosphorous pesticides in fruit juices and vegetables applying response surface methodology

机译：Montmorillonite /聚苯胺/聚酰胺纳米复合物作为一种新型搅拌棒涂层，用于在果汁和蔬菜施加响应面方法中的有机磷农药的吸附萃取

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摘要

In this research a novel nanocomposite based on incorporation of montmorillonite (MMT) into a polyaniline-polyamide (PANI-PA) hybrid was prepared by in situ oxidative polymerization of polyaniline in the MMT-PA mixture and subsequently solvent exchange method was used to obtain a thin layer onto a stir bar substrate. The prepared nanocomposite was characterized using Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The prepared MMT/PANI/PA nanocomposite-based stir bar was applied as an extraction device for stir bar sorptive extraction (SBSE) of organophosphorous pesticides (OPPs) in some fruit juices and vegetables in combination with gas chromatography-flame ionization detector (GC-FID) detection. The effect of the MMT amount in the nanocomposite and also the effect of PANI hybridization on the extraction capability of the coating were investigated. Important factors influencing the extraction and desorption processes including extraction time, salt content, pH, desorption solvent, its volume and desorption time were studied and optimized using response surface methodology (RSM) applying central composite design (CCD). The limit of detection (LOD) and linear dynamic range (LDR) of the method were in the range of 0.2 to 1 ng mL(-1) and 0.6-1000 and 3-1000 ng mL(-1), respectively. The method precision (RSD%) with four replicate determinations was in the range of 2.5 to 4.4% for distilled water at the concentration level of 100 ng mL(-1). The developed method was successfully applied to the various fruit juices and vegetable samples, while the relative recoveries (RR%) were found to be in the range of 80.0 to 99.7%.
机译：在本研究中，通过在MMT-PA混合物中的聚苯胺的氧化聚合，使用基于蒙脱石（MMT）掺入聚酰氯聚酰胺（PANI-PA）杂种中的新型纳米复合材料，然后使用溶剂交换方法获得A.薄层上搅拌棒衬底。使用傅里叶变换红外光谱（FTIR），能量分散X射线光谱（EDX），X射线衍射（XRD）和扫描电子显微镜（SEM）使用制备的纳米复合材料。将制备的MMT / PANI / PA纳米复合材料的搅拌棒作为搅拌棒的萃取装置用于一些果汁和蔬菜的有机磷农药（SBSE），与气相色谱 - 火焰离子化检测器组合（GC- FID）检测。研究了MMT量在纳米复合材料中的影响以及PANI杂交对涂层萃取能力的影响。研究和解吸过程中的重要因素，包括提取时间，盐含量，pH，解吸溶剂，其体积和解吸时间，并使用响应面方法（RSM）应用中央复合设计（CCD）进行优化。该方法的检测极限（LOD）和线性动态范围（LDR）分别为0.2至1ng ml（-1）和0.6-1000和3-1000ng ml（-1）。在浓度水平为100ng ml（-1）的蒸馏水中，具有四个重复测定的方法精度（RSD％）的比例为2.5至4.4％。开发方法已成功应用于各种果汁和蔬菜样品，而发现相对回收率（RR％）在80.0至99.7％的范围内。

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