Tian Wei, Zhou Minghui, Liu Yonglin, Wu Yanxiang, Zhang Jieqiong, Chen Xi, Wang Songxue
Academy of National Food and Strategic Reserves Administration, Beijing 100037, China.
School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, China.
Food Chem X. 2023 Mar 10;18:100636. doi: 10.1016/j.fochx.2023.100636. eCollection 2023 Jun 30.
How to quickly separate and detect cadmium (Cd) and lead (Pb) from solid samples is a difficult problem that needs to be solved. For this, FeO@agarose@iminodiacetic acid (IDA) was synthesized and used for rapid purification of Cd and Pb. This material can remove complex matrix interference completely within a short time of 15 min. The mechanism of the adsorption kinetics fit well to a pseudo-second-order model. A portable screen-printed electrodes (SPEs)-based electrochemical detection platform was established. After coupling with the pretreatment, the whole detection process only took within 30 min. The limits of detection (LOD) were ten times lower than those of the Codex general standard, with values of 0.02 and 0.01 mg/kg for Pb and Cd, respectively. The recoveries ranged from 84.1% to 109.7% in naturally contaminated grain, in good agreement with the ICP-MS, demonstrating great prospects for the rapid screening and monitoring of Cd and Pb in grain.
如何从固体样品中快速分离并检测镉（Cd）和铅（Pb）是一个亟待解决的难题。为此，合成了FeO@琼脂糖@亚氨基二乙酸（IDA）并用于快速纯化Cd和Pb。该材料能在15分钟的短时间内完全消除复杂基质干扰。吸附动力学机制与准二级模型拟合良好。建立了基于便携式丝网印刷电极（SPEs）的电化学检测平台。与预处理相结合后，整个检测过程仅需30分钟。检测限（LOD）比食品法典通用标准低十倍，Pb和Cd的值分别为0.02和0.01mg/kg。在天然污染谷物中的回收率为84.1%至109.7%，与电感耦合等离子体质谱法（ICP-MS）结果吻合良好，表明该方法在谷物中Cd和Pb的快速筛查和监测方面具有广阔前景。
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