Abstract：
In this work, a new dendrimer modified magnetic graphene oxide (GO) was used as a substrate for electrodeposition of Au nanoparticles. The modified magnetic electrode was employed for sensitive measuring of As(III) ion as a well-established human carcinogen. The prepared electrochemical device exhibits excellent activity towards As(III) detection using the square wave anodic stripping voltammetry (SWASV) protocol. At optimum conditions (deposition potential at -0.5 V for 100 s in 0.1 M acetate buffer with pH 5.0), a linear range from 1.0 to 125.0 μgL-1 with a low detection limit (calculated by S/N = 3) of 0.47 μg L-1 was obtained. In addition to the simplicity and sensitivity of the proposed sensor, its high selectivity against some major interfering agents, such as Cu(II) and Hg(II) makes it an appreciable sensing tool for the screening of As(III). In addition, the sensor revealed satisfactory results for detection of As(III) in different water samples, and the accuracy of obtained data were confirmed by inductively coupled plasma atomic emission spectroscopy (ICP-AES) setup. Accounting for the high sensitivity, remarkable selectivity and good reproducibility, the established electrochemical strategy has great potential for analysis of As(III) in environmental matrices.
摘要：
在这项工作中,一种新的树枝状聚合物改性的磁性氧化石墨烯（GO）被用作电沉积Au纳米颗粒的基底。改良的磁性电极用于灵敏测量As（III）离子作为公认的人类致癌物。所制备的电化学装置对使用方波阳极溶出伏安法(SWASV)方案的As(III)检测表现出优异的活性。在最佳条件下（在pH5.0的0.1M乙酸盐缓冲液中，沉积电位为-0.5V，持续100s），线性范围为1.0至125.0μgL-1，低检出限（由S/N=3计算）为0.47μgL-1。除了所提出的传感器的简单性和灵敏度，它对一些主要干扰剂的高选择性，例如Cu（II）和Hg（II）使其成为筛选As（III）的可观的传感工具。此外,该传感器对不同水样中As(III)的检测结果令人满意，所得数据的准确性通过电感耦合等离子体原子发射光谱法(ICP-AES)确定。会计的高度敏感性，显著的选择性和良好的重现性，所建立的电化学策略对于分析环境基质中的As（III）具有巨大的潜力。
