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A novel ion-imprinted electrode prepared by in situ polymerization for detection of platinum

机译：通过原位聚合制备用于检测铂的新型离子印迹电极

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摘要

To develop a convenient method for sensitive and selective determination of platinum in complicated matrices, an ion-imprinted electrode was studied by in situ polymerization of Pt(IV) ion-imprinted membranes (Pt(IV)-IIMs) on the surface of a glassy carbon electrode (GCE). After the experimental parameters for the preparation of Pt(IV)-IIMs such as functional monomer, molar ratio of template, monomer and cross-linking agent together with extraction condition were optimized, an electrode with good regeneration, high stability and specific recognition to Pt(IV) was obtained by modifying GCE with Pt(IV)-IIMs prepared in acetonitrile using allylurea (NAU) as functional monomer, ethylene glycol dimethacrylate (EGDMA) as cross-linking agent, azobisisobutyronitrile (AIBN) as initiator under the molar ratio of template (H2PtCl6), NAU and EGDMA as 1 : 4 : 40. The resulting electrode named as Pt(IV)-IIMs/GCE exhibits high response sensitivity to Pt(IV) in phosphate buffer (pH 5.29). The calibration graph for the determination of Pt(IV) by Pt(IV)-IIMs/GCE is linear in the range of 2.0 x 10(-8) similar to 2.5 x 10(-4) mol L-1 with a detection limit of 4.0 x 10(-9) mol L-1. No metal ions tested at a concentration 25 times higher than that of Pt(IV) interfered in the determination. The electrode was successfully applied to determine platinum in catalyst and plant samples with a relative standard deviation (RSD) of less than 3.0% (n = 5) and recoveries in the range of 97.8-103.6%.
机译：为了开发一种灵敏且选择性地测定复杂基质中铂的便捷方法，通过在玻璃表面上原位聚合Pt（IV）离子印迹膜（Pt（IV）-IIMs），研究了离子印迹电极碳电极（GCE）。优化了功能性单体，模板，单体和交联剂的摩尔比以及萃取条件等制备Pt（IV）-IIMs的实验参数，电极具有良好的再生性，高稳定性和对Pt的特异性识别（IV）是通过在乙腈中使用烯丙基脲（NAU）作为功能性单体，乙二醇二甲基丙烯酸酯（EGDMA）作为交联剂，偶氮二异丁腈（AIBN）作为引发剂在乙腈中制备的Pt（IV）-IIM修饰GCE而获得模板（H2PtCl6），NAU和EGDMA为1：4：40。所得电极名为Pt（IV）-IIMs / GCE，在磷酸盐缓冲液（pH 5.29）中对Pt（IV）表现出高响应灵敏度。通过Pt（IV）-IIMs / GCE测定Pt（IV）的校准图在2.0 x 10（-8）范围内呈线性，类似于2.5 x 10（-4）mol L-1，具有检测极限4.0×10（-9）mol L-1。浓度比Pt（IV）高25倍的金属离子不会影响测定。该电极已成功用于测定催化剂和植物样品中的铂，相对标准偏差（RSD）小于3.0％（n = 5），回收率在97.8-103.6％范围内。

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