数字农科院2.0

Rapid and Portable Detection of Heavy Metals in Plastic Food Packaging Materials Using ED-XRF with Monochromatic Excitation and Fundamental Parameter Calibration

文献类型： 外文期刊

作者： Xiaoshuang Shi;Yan Xu;Xiaojing Liu;Hongwei Shi;Guanyu Lan;Zhenzhen Yao;Hongli Tian;Guiqiao Liu;Yan Zhang;Xuefei Mao

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期刊名称： Atomic Spectroscopy

ISSN： 0195-5373

年卷期： 2025 年 46 卷 4 期

页码：

收录情况： SCIE（2025版）

摘要： The presence of toxic metals in plastic packaging has been demonstrated to permeate foodstuffs, thereby posing a considerable threat to both food safety and human health. Considering relatively lower levels of heavy metals in various food plastic packaging materials, it is urgent to develop a sensitive, fast and portable analysis tool. In this study, a new portable energy dispersion X-ray fluorescence spectrometry (ED-XRF) with monochromatic excitation for the simultaneous determination of Pb, Cd, As, Cr, Ni, Sn, Cu, Ba, Sb and Zn in plastic packaging sample for the first time. By optimizing the full focused hyperbolic curved crystal and fundamental parameter (FP) calibration method, sensitive analysis was fulfilled with the detection limits (LODs) of 0.07-0.25 mg/kg, as well as the interference from complex plastic matrix and overlapping characteristic spectral lines of As Kα and Pb Lα were completely eliminated after the verification of a series of self-made plastic reference materials. For powdered or non-destructive plastic samples, each measurement time can be shortened to less than 10 min with the relative standard deviations (RSDs) < 5% at 7.2-136.8 mg/kg and < 17% at 0.3-2.3 mg/kg, respectively. The measurements by ED-XRF exhibited strong agreement with the microwave digestion ICP-MS approach. Therefore, the recommended portable ED-XRF method is characterized by sensitivity, accuracy and stability, and is extremely suitable for field monitoring of multi-elements in plastic food packaging samples to ensure the plastic quality and food safety.

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