碳量子点–高锰酸钾–鲁米诺化学发光体系测定食品包装材料中的银溶出量

Determination of Leaching Silver in Food Packaging Materials by Carbon Dots KMnO4-Luminol Chemiluminescence System

摘要: 通过一步水热法制备了铕掺杂的碳量子点(Eu-CDs)，在磷酸盐缓冲介质中，Eu-CDs对鲁米诺–高锰酸钾化学发光体系具有增敏作用，而Ag⁺对Eu-CDs-Luminol-KMnO₄化学发光体系有明显增强作用，据此建立了化学发光法测定痕量Ag⁺的新方法，线性范围是0.5~30 ng∙mL⁻¹，方法检出限是0.08 ng∙mL⁻¹，相对标准偏差为2.1% (n = 11, c = 15 ng∙mL⁻¹)。该方法成功应用于食品包装材料中银离子的检测，回收率在91%~117%之间。

Abstract: Europiumdoped Carbondots (Eu-CDs) was prepared through one step hydrothermal method. In phosphate buffer medium, Eu-CDs has great sensibilization to the Luminol-KMnO4 chemilumines-cence. Furthermore, it was found that Ag⁺ could enhance the Eu-CDs-Luminol-KMnO₄ chemilumi-nescence system. Based on this, a new method for the determination of trace Ag⁺ by chemilumi-nescence was established. The linear range was 0.5 - 30 ng∙mL⁻¹. The detection limit was 0.08 ng∙mL⁻¹; the relative standard deviation was 2.1% (n = 11, c = 15 ng∙mL⁻¹). The authors successfully applied this method to the detection of silver ions in food antibacterial packaging boxes, and the recovery rate was between 91% and 117%.