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

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。

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%.