基于铁基金属有机骨架电化学传感器检测食品中的Cd2+和Pb2+

制备铁基金属有机框架（Fe-HHTP）负载于多壁碳纳米管修饰玻碳电极（Fe-HHTP-MWCNT/GCE）传感器，用来同时检测食品中的Cd2+和Pb2+。经过一系列的条件优化，实验结果表明Cd2+和Pb2+在pH=5.75的醋酸盐缓冲液、富集电位为-1.0 V、富集时间为180 s、修饰涂层为3层的时候，有比较明显的效果。在优化条件下，发现Cd2+和Pb2+的溶出峰电流的变化趋势和浓度有关，并形成了良好的线性关系。Cd2+的线性范围为5～500 ng/mL，（R2=0.9993），检出限为0.538 ng/mL；Pb2+的线性范围为5～500 ng/mL，(R2=0.9997)，检出限为0.592 ng/mL。该法可用于检测粮食、饮料、生活饮用水中Cd2+和Pb2+的含量，结果较为满意。

Determination of Cd2+ and Pb2+ in food by electrochemical sensor based on organic skeleton of iron foundation

A multiwalled carbon nanotube modified glassy carbon electrode (Fe-HHTP-MWCNT/GCE) sensor was prepared to detect Cd2+ and Pb2+ in food simultaneously. After a series of optimized conditions, the experimental results show that Cd2+ and Pb2+ have obvious effects in pH=5.75 acetate buffer, enrichment potential of -1.0 V, enrichment time of 180 s, three layers of modified coating. Under optimized conditions, it is found that the trend of dissolution peak currents of Cd2+ and Pb2+ is related to concentration, and a good linear relationship is formed. The linear range of Cd2+ was 5-500 ng/mL (R2=0.9989), and the detection limit was 0.538 ng/mL. The linear range of Pb2+ was 5-500 ng/mL (R2=0.9994), and the detection limit was 0.592 ng/mL. This method can be applied to the determination of Cd2+ and Pb2+ in food, beverage and drinking water with satisfactory results.