Abstract

In this study, a new magnetic ion-imprinted polymer was prepared as a nanosorbent for selective extraction and pre-concentration of low levels of Cd(II) and Ni(II) prior to determination by flame atomic absorption spectrometry. The sorbent material consists of graphene oxide as a carrier, Fe₃O₄ nanoparticles as magnetic components immobilized on the surface of the carrier and polydopamine as a metal ion-imprinted polymer which is uniformly coated on the surface of the magnetic graphene oxide sheet layer. Several factors affecting the extraction of the analytes were studied and optimized. In the optimum conditions, the calibration graphs were linear in the ranges of 0.1–18 and 0.1–20 ng/mL for Cd(II) and Ni(II), respectively. The limits of detection (3s_b/m) for Cd(II) and Ni(II) were 25 and 60 pg/mL, respectively. The accuracy of the method was confirmed by successful analyzing the certified reference material NIST SRM 1643e. The method can be used for the pre-concentration and determination of Ni(II) and Cd(II) in water samples.

中文翻译：

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利用基于离子印迹聚多巴胺涂层的磁性石墨烯氧化物的纳米复合材料从水样中萃取Cd（II）和Ni（II）

摘要

在这项研究中，制备了一种新型的磁性离子印迹聚合物作为纳米吸附剂，用于在火焰原子吸收光谱法测定之前选择性萃取和预浓缩低含量的Cd（II）和Ni（II）。吸附剂材料由作为载体的氧化石墨烯，固定在载体表面上的作为磁性组分的Fe ₃ O ₄纳米颗粒和作为金属离子压印的聚合物的聚多巴胺均匀地涂覆在磁性氧化石墨片层的表面上。研究和优化了影响分析物提取的几个因素。在最佳条件下，Cd（II）和Ni（II）的校准曲线分别在0.1-18 ng / mL和0.1-20 ng / mL范围内呈线性关系。检出限（3 s _b/米）镉（II）和Ni（II）分别为25和60微克/毫升，分别。通过成功分析经认证的参考材料NIST SRM 1643e，确认了该方法的准确性。该方法可用于水样中镍（II）和镉（II）的富集和测定。