Medicine, Surgery and Anatomy Veterinary Department, Veterinary Faculty, University of León, Campus de Vegazana, 24071, León, Spain.
Animal Production Department, Veterinary Faculty, University of León, 24071, León, Spain.
Environ Sci Pollut Res Int. 2019 Oct;26(28):28909-28918. doi: 10.1007/s11356-019-06036-7. Epub 2019 Aug 5.
Milk can be considered as an indicator of the degree of environmental contamination of the place where it is produced and this is especially important when assessing its content in toxic metals. Therefore, 36 bovine milk samples from 7 farms with a semi-extensive grazing system were analysed, located in Asturias (Spain), in an area with high probability of being highly contaminated due to a mining zone, with important industrial activity and near high-density highway traffic. The samples were lyophilised to achieve total dehydration, further analysed using inductively coupled plasma mass spectrometry (ICP-MS). The metals titrated were aluminium (Al), arsenic (As), molybdenum (Mo) and mercury (Hg) in the lyophilised samples and subsequently extrapolated their values to whole milk. All samples analysed showed levels of Al and Mo above the limit of detection, with mean values of Al of 140.89 ± 157.07 in liquid milk and 1065.76 ± 1073.45 in lyophilised milk and Mo of 20.72 ± 14.61 μg/kg and 152.26 ± 96.82 μg/kg in whole and lyophilised milk. Only As was detected in four samples with mean values of 18.45 ± 6.89 and 166.45 ± 42.30 μg/kg in liquid and lyophilised milk, respectively, and no Hg was found in any of them. In no case do the values found indicate a significant hazard to the population and are in agreement with those found in other investigations. Although the various anthropogenic activities of the area (industrial, mining, traffic density) could, a priori, indicate a possibly contaminated area.
牛奶可以被视为其产地环境污染程度的一个指标，这在评估其有毒金属含量时尤为重要。因此，对来自阿斯图里亚斯（西班牙）7 个半放牧系统农场的 36 份牛奶样本进行了分析，这些农场位于一个因采矿区、重要工业活动和附近高交通密度公路而极有可能受到高度污染的地区。对样本进行了冷冻干燥以实现完全脱水，然后使用电感耦合等离子体质谱法（ICP-MS）进一步分析。对冷冻干燥样本中滴定的金属（铝、砷、钼和汞）进行了分析，并随后推断出其全脂牛奶中的值。所有分析的样本均显示出铝和钼的含量超过了检测限，液态奶中的铝平均值为 140.89 ± 157.07μg/L，冷冻干燥奶中的铝平均值为 1065.76 ± 1073.45μg/L；全脂和冷冻干燥奶中的钼平均值分别为 20.72 ± 14.61μg/kg 和 152.26 ± 96.82μg/kg。只有 4 个样本中检测到砷，其液态奶和冷冻干燥奶中的平均值分别为 18.45 ± 6.89μg/L 和 166.45 ± 42.30μg/L，且所有样本中均未检测到汞。在任何情况下，所发现的数值都没有表明对人群存在重大危害，并且与其他调查的结果一致。尽管该地区存在各种人为活动（工业、矿业、交通密度），但可能表明该地区存在污染。
