Heavy metal levels in the dairy production chain in China

Shengsheng Liu, Qingyu Zhao, Chaohua Tang, Yuning Liu, Junmin Zhang
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Abstract

The aims of this study were to investigate the heavy metal pollution status and distribution and to analyze the relationships among metal concentrations of different links in the dairy production chain. Chromium (Cr), arsenic (As), cadmium (Cd), lead (Pb), copper (Cu), and zinc (Zn) levels in water, fodder, milk, blood, hair, and feces samples collected from cows from five dairy farms in China were measured. The concentrations of Cr, As, Cd, Pb, Cu, and Zn were 4.61–11.11, 0.06–0.46, 0.17–0.29, 2.84–4.23, 4.11–7.72, and 7.23–19.91 mg/kg in silage; 12.72–40.85, 0.76–2.40, 0.05–0.16, 4.73–9.16, 44.14–78.46, and 4148.51–4845.20 μg/L in milk; 33.59–60.73, 0.09–3.57, 0.29–1.78, 20.14–39.20, 821.34–1007.45, and 2665.10–4929.95 μg/L in blood; 0.59–1.06, 0.02–0.09, 0.08–0.11, 1.70–2.09, 6.45–8.64, and 9.73–1.56 mg/kg in hair; 31.75–296.35, 0.33–5.96, 0.18–0.53, 3.35–9.06, 12.27–41.39, and 56.54–196.34 mg/kg in feces, respectively. The concentrations of heavy metals in hair were higher than those in the other samples and when combined with the results from the silage and tissue samples, we can assume that cow's hair can be used as a biological indicator for heavy metal contamination in the dairy production chain.

Abstract Image

中国乳制品生产链中的重金属含量
本研究旨在调查重金属污染状况和分布,并分析乳制品生产链中不同环节的金属浓度之间的关系。研究测定了中国五个奶牛场的奶牛水、饲料、奶、血液、毛发和粪便样品中的铬(Cr)、砷(As)、镉(Cd)、铅(Pb)、铜(Cu)和锌(Zn)含量。91毫克/千克;青贮中为12.72-40.85、0.76-2.40、0.05-0.16、4.73-9.16、44.14-78.46和4148.51-4845.20微克/升;牛奶中为33.59-60.73、0.09-3.57、0.29-1.78, 20.14-39.20, 821.34-1007.45, and 2665.10-4929.95 μg/L; 0.59-1.06, 0.02-0.09, 0.08-0.11, 1.70-2.09, 6.45-8.毛发中的重金属含量分别为 31.75-296.35、0.33-5.96、0.18-0.53、3.35-9.06、12.27-41.39 和 56.54-196.34毫克/千克。毛发中的重金属浓度高于其他样本,结合青贮和组织样本的结果,我们可以认为奶牛毛发可作为乳制品生产链中重金属污染的生物指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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