2016-2017年中国苦丁茶中7种元素含量的调查分析
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1.安徽省疾病预防控制中心;2.国家食品安全风险评估中心

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Investigation and analysis of the content of 7 elements in Kudincha tea in China from 2016-2017
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1.Anhui Provincial Center for Disease Control and Prevention,Anhui;2.National Health Commission Key Laboratory of Food Safety Risk Assessment of Health

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    摘要:

    目的 调查中国苦丁茶中7种元素的含量、分布特征。 方法 2016-2017年采集中国20个省市的市售苦丁茶样品,应用微波消解-电感耦合等离子体质谱法同时测定其铅、镉、汞、砷、铝、铬、镍的含量,采用Mann-Whitney U 检验、Kruskal-Wallis检验对7种元素的含量进行分析。采用Kendall相关系数法进行相关性分析。结果 大叶苦丁茶中7种元素的含量水平从高到低依次为铝、镉、镍、总铬、总砷、铅和总汞。小叶苦丁茶中7种元素的含量水平从高到低依次为铝、镍、铅、总铬、总砷、镉和总汞。大叶苦丁茶中镉、镍、千和总砷4种元素含量的频数分布高于小叶苦丁茶,其中镉的含量约是小叶苦丁茶的26倍,小叶苦丁茶中铅、汞和总铬3种元素含量的频数分布高于大叶苦丁茶,其中铅的含量显著高于大叶苦丁茶。两种代用茶的6种元素含量存在地区差异性,且部分元素之间存在相关性。结论 大叶苦丁茶与小叶苦丁茶均存在7种元素的污染,其含量存在地区差异性和相关性;两种代用茶对铝、镉、铅等重点元素富集能力存在显著差异,其健康风险需进一步研究。

    Abstract:

    To investigate the content and distribution characteristics of 7 elements in Kuding tea in Chinese market. Methods The Kuding tea samples from 20 provinces and cities in China were collected from 2016-2017, and the contents of lead, cadmium, mercury, arsenic, aluminum, chromium and nickel were simultaneously determined by microwave digestion and inductively coupled plasma mass spectrometry. 7 elements were analyzed by Mann-Whitney U test and Kruskal-Wallis test, and the correlation was analyzed by Kendall correlation coefficient. Results The content levels of 7 elements in the large-leaf Kuding tea from high to low were aluminum, cadmium, nickel, total chromium, total arsenic, lead and total mercury. The content levels of 7 elements in small -leaf Kuding tea from high to low were aluminum, nickel, lead, total chromium, total arsenic, cadmium and total mercury. The frequency distribution of cadmium, nickel, thousand and total arsenic in large-leaf Kuding tea was higher than that in small-leaf Kuding tea, the content of cadmium was about 26 times of that in small-leaf Kuding tea, the frequency distribution of lead, mercury and total chromium in small-leaf Kuding tea was higher than that in large-leaf Kuding tea, and the content of lead was significantly higher than that in large-leaf Kuding tea. There were regional differences in the content of 6 elements of the two alternative teas, and some elements were correlated. Conclusion There are 7 elements pollution in both large-leaf Kuding tea and small-leaf Kuding tea, and their contents are different and correlated in different regions. There are significant differences in the enrichment ability of key elements such as aluminum, cadmium and lead between the two substitute teas, and their health risks need to be further studied.

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  • 收稿日期:2024-05-16
  • 最后修改日期:2025-04-30
  • 录用日期:2025-05-06
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