电化学吸附溶出伏安法超灵敏定量测定食品和水样中的铜。
Ultra-sensitive quantification of copper in food and water samples by electrochemical adsorptive stripping voltammetry.
机构信息
Department of Chemistry, Faculty of Sciences, Ilam University, Ilam, Iran.
出版信息
Environ Monit Assess. 2013 Nov;185(11):8823-9. doi: 10.1007/s10661-013-3215-2. Epub 2013 Apr 27.
A new electrochemical adsorptive stripping voltammetry method was developed for the determination of trace amounts of copper in food and water samples. The study of electrochemical behavior of Cu ion indicated that Cu(II) and Schiff base formed a complex in H₃BO₄-NaOH buffer solution (pH = 7.25). An accumulation potential of -100 mV (vs Ag/AgCl) was applied while the solution was stirred for 60 s. The response curve was recorded by scanning the potential, and the peak current of -0.31 V (vs Ag/AgCl) was recorded. The peak current and concentration of copper accorded with linear relationship in the range of 0.04-120 ng mL(-1). The relative standard deviation (for 12 ng mL(-1) of copper) was 1.73%, and the detection limit was 0.007 ng mL(-1). The possible interference of some common ions was studied. The proposed method was applied to the determination of copper in water, rice, wheat, tea, milk, and tomato with satisfactory results.
一种新的电化学吸附溶出伏安法被开发出来，用于测定食品和水样中的痕量铜。Cu 离子的电化学行为研究表明，Cu(II)和希夫碱在硼酸-氢氧化钠缓冲溶液（pH = 7.25）中形成配合物。在搅拌 60 秒的同时施加-100 mV 的富集电位。通过扫描电势记录响应曲线，并记录-0.31 V（相对于 Ag/AgCl）处的峰电流。在 0.04-120 ng mL(-1)范围内，峰电流与铜的浓度呈线性关系。铜浓度为 12 ng mL(-1)时的相对标准偏差（RSD）为 1.73%，检测限为 0.007 ng mL(-1)。研究了一些常见离子的可能干扰。该方法应用于水、大米、小麦、茶、牛奶和番茄中铜的测定，结果令人满意。
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