基于氟化石墨烯和金纳米笼纳米复合材料的电化学方法同时测定重金属。

Simultaneous determination of heavy metals by an electrochemical method based on a nanocomposite consisting of fluorinated graphene and gold nanocage.

机构信息

Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials & Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei Key Laboratory of Polymer Materials, National & Local Joint Engineering Research Center of High-throughput Drug Screening Technology, Key Laboratory of Regional Development and Environmental Response in Hubei Province, Faculty of Resources and Environmental Science, College of Chemistry & Chemical Engineering, Hubei University, Wuhan, 430062, People's Republic of China.

Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan, 430062, China.

出版信息

Mikrochim Acta. 2020 Jun 29;187(7):414. doi: 10.1007/s00604-020-04393-6.

DOI:10.1007/s00604-020-04393-6

PMID:32602018

Abstract

Fluorinated graphene/gold nanocage (FGP/AuNC) nanocomposite was developed for simultaneous determination of heavy metals using square wave anodic stripping voltammetry. Under optimized conditions, with a buffer pH of 5.0, a deposition potential of - 1.25 V, and a deposition time of 140 s, the method can obtain the best results. The FGP/AuNC electrode exhibits low limits of detection (0.08, 0.09, 0.05, 0.19, 0.01 μg L), wide linear ranges (6-7000, 4-6000, 6-5000, 4-4000, 6-5000 μg L), and well-separated stripping peaks (at - 1.10, - 0.77, - 0.50, - 0.01, 0.31 V vs Ag/AgCl) towards Zn, Cd, Pb, Cu, and Hg, respectively. Furthermore, the FGP/AuNC electrode is also used for simultaneous determination of Zn, Cd, Pb, Cu, and Hg in real samples (peanut, rape bolt, and tea). Highly consistent results are found between the electrochemical method and atomic fluorescence spectrometry/inductively coupled plasma-mass spectrometry. The method has been successfully applied to the determination of heavy metal ions in agricultural food. Graphical abstract Schematic representation of simultaneous determination of heavy metal ions by electrochemical method. The FGP/AuNC (fluorinated graphene/gold nanocage) electrode is used to simultaneous determination of Zn, Cd, Pb, Cu, and Hg by square wave anode stripping voltammetry.

摘要

氟化石墨烯/金纳米笼（FGP/AuNC）纳米复合材料的开发用于使用方波阳极溶出伏安法同时测定重金属。在优化条件下，缓冲液 pH 值为 5.0，沉积电位为-1.25 V，沉积时间为 140 s，该方法可以获得最佳结果。FGP/AuNC 电极具有较低的检出限（0.08、0.09、0.05、0.19、0.01μg L）、较宽的线性范围（6-7000、4-6000、6-5000、4-4000、6-5000μg L）和分离良好的溶出峰（分别在-1.10、-0.77、-0.50、-0.01、0.31 V 相对于 Ag/AgCl），可分别测定 Zn、Cd、Pb、Cu 和 Hg。此外，FGP/AuNC 电极还用于同时测定实际样品（花生、油菜籽和茶叶）中的 Zn、Cd、Pb、Cu 和 Hg。电化学方法和原子荧光光谱/电感耦合等离子体质谱法之间的结果高度一致。该方法已成功应用于农业食品中重金属离子的测定。