Lab-on-Paper with Dual Electrochemical/Colorimetric Detection for Simultaneous Determination of Gold and Iron
Lab-on-Paper with Dual Electrochemical/Colorimetric Detection for Simultaneous Determination of Gold and Iron
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DOI：
10.1021/ac9022555
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发表时间：
2010-03-01
影响因子：
7.4
通讯作者：
Chailapakul, Orawon
中科院分区：
文献类型：
--
作者：
Apilux, Amara;Dungchai, Wijitar;Chailapakul, Orawon
本文提出了一种新的纸上实验室装置，该装置结合电化学和比色检测，用于在工业废液中存在常见干扰Fe（III）的情况下快速筛选Au（III）。以稀王水（0.1 M HCl + 0.05 M HNO 3）为支持电解质，在纸上方波伏安法中，Au（III）在287 +/- 12 mV（相对于Ag/AgCl）处有一个明确的还原峰。在优化的工作条件下，Au（III）浓度在1-200 ppm范围内线性关系良好，相关系数为0.997。拟定方法的检测限（LOD）为1 ppm。还研究了各种阳离子的干扰。当Fe（III）浓度超过Au（III）浓度的2.5倍时，Fe（III）是唯一影响Au（III）电化学测定的金属。为了克服这一局限性，比色法被用来同时检测铁（III）的筛选工具。该方法已成功地应用于黄金精炼废液中Au（III）的测定。结果与电感耦合等离子体原子发射光谱法（ICP-AES）一致。
A novel lab-on-paper device combining electrochemical and colorimetric detection for the rapid screening of Au(III) in the presence of it common interference, Fe(III), in industrial waste solutions is presented here. With dilute aqua regia (0.1 M HCl + 0.05 M HNO3) as the supporting electrolyte, square wave voltammetry on paper provided it well-defined reduction peak for Au(III) at similar to 287 +/- 12 mV vs Ag/AgCl. Under the optimized working conditions, the calibration curve showed good linearity in the concentration range of 1-200 ppm of Au(III) with a correlation coefficient of 0.997. The limit of detection (LOD) of the proposed method is 1 ppm. Interferences from various cations were also studied. Fe(III) is the only metal that affects the electrochemical determination of Au(III) when present above it 2.5-fold excess concentration of that of the Au(III). To overcome this limitation, a colorimetric method was used to simultaneously detect Fe(III) its it screening tool. The procedure was then successfully applied to determine Au(III) in gold-refining waste solutions. The results are in agreement with those obtained from inductively coupled plasma-atomic emission spectrometry (ICP-AES).