基于BiOCl-MWCNT/GCE检测食品中痕量Zn(Ⅱ)

Trace Determination of Zn(Ⅱ) in Food Based on BiOCl-MWCNT/GCE

制备BiOCl-MWCNT/GCE电化学传感器,并将其用于测定食品中痕量Zn(Ⅱ)。结果表明, Zn(Ⅱ)在醋酸盐缓冲液pH 4.50,富集电位-1.40 V,富集时间120 s,涂层为三层时反应最为明显。在优化条件下, Zn(Ⅱ)的溶出峰电流随着浓度的增加而增加,并呈现良好的线性关系,线性范围为4.00~660μg/L (R2=0.991 2),检测限为1.25μg/L(S/N=3),对于实际样品的回收率为94.12%~103.33%。该方法可应用于葡萄糖口服溶液中Zn(Ⅱ)含量检测,结果令人满意。

BiOCl-MWCNT/GCE electrochemical sensors were prepared and used to determine trace Zn(Ⅱ) in food. The results demonstrated that that the reaction of Zn(Ⅱ) was the most obvious when the acetate buffer pH was 4.50, the deposition potential was-1.40 V, the deposition time was 120 s, and the coating was three-layer. Under optimized conditions, with the increase of Zn(Ⅱ) concentration, the anodic stripping currents of Zn(Ⅱ) were proportional to concentrations in the linear range of 4.00 to 660 μg/L(R2=0.991 2), and the detection limit was 1.25 μg/L(S/N=3). The recovery rate for the actual sample was 94.12%-103.33%. This method could be applied to the determination of Zn(Ⅱ) in glucose oral solution with satisfactory results.