Abstract Low-density polyethylene (LDPE) films containing three types of nanometals (ZnO, Cu, or Ag) were prepared and characterized. A release experiment was carried out on the nanocomposite films subjected to three treatments: no irradiation, gamma irradiation with solvent contact (10 kGy), and gamma irradiation without solvent contact. The release of heavy metals from the nanocomposite films into three types of solvents (water, 95 % ethanol, and 3 % acetic acid) was recorded at room temperature. In general, gamma irradiation was likely to promote the release of heavy metals. The release amount of heavy metals depended on the type of nanometal and solvent. An increase in release amount of Zn and Cu was observed in 95 % ethanol and Ag in all types of solvents at the end of the experiment after the film samples were treated with gamma irradiation (with solvent contact during irradiation). The increase in heavy metal release was attributed to the accelerated surface oxidation of nanometals after irradiation, as confirmed by XPS analysis on the irradiated Ag powders.

中文翻译：

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重金属从经辐照的 LDPE/纳米金属复合薄膜释放到食品模拟物中

摘要 制备并表征了含有三种纳米金属（ZnO、Cu 或 Ag）的低密度聚乙烯 (LDPE) 薄膜。对经受三种处理的纳米复合膜进行了释放实验：无辐照、伽马辐照与溶剂接触 (10 kGy) 和伽马辐照无溶剂接触。在室温下记录了重金属从纳米复合薄膜释放到三种溶剂（水、95% 乙醇和 3% 乙酸）中的情况。一般来说，伽马辐射可能会促进重金属的释放。重金属的释放量取决于纳米金属和溶剂的类型。在实验结束时，在所有类型的溶剂中的 95% 乙醇和 Ag 中观察到 Zn 和 Cu 的释放量增加，之后用伽马辐射处理薄膜样品（在辐射过程中与溶剂接触）。重金属释放的增加归因于辐照后纳米金属的加速表面氧化，正如对辐照后的银粉的 XPS 分析所证实的那样。