浙江省十大名茶主要重金属元素分析

doi:10.3864/j.issn.0578-1752.2014.19.021

Abstract

Abstract: 【Objective】The rare earth (counted by total amount of oxides ∑ReOs), arsenic (As), chromium (Cr), cadmium (Cd), lead (Pb) content of top ten teas (West Lake Longjing included) in Zhejiang Province were investigated. The regularities of distribution of major heavy metals in top ten teas were analysed which will provide a scientific basis for safety evaluation and geographic origin in the famous teas. 【Method】A total of 78 samples were collected from 11 counties in 6 prefecture-level cities in Zhejiang province, which belongs to 11 species, i.e. West Lake longjing, Huiming tea, Jingshan tea, Kaihua longding, Anji white tea, Qiandao yuye, Dafo longjing, Yuexiang longjing, Wuyang chunyu, Lujian tea, and Songyang yinhou. The ∑ReOs, As, Cr, Cd and Pb contents were determined with the nitric acid-microwave digestion treatment method, and the results were analyzed by principal component analysis and cluster analysis.【Result】The contents of ∑ReOs, As, Cr, Cd and Pb in top ten teas were all in the allowed range of relevant standards, and significant differences were found in the content among top ten teas. The ∑ReOs content ranged from 0.305 mg·kg^-1 to 1.049 mg·kg^-1, where the highest content was in LJT, YXLJ had the lowest content. The average As content ranged from 0.053 mg·kg^-1 in SYYH to 0.121 mg·kg^-1 in WLLJ. The average Cr content ranged from 0.553 mg·kg^-1 in KHLD to 2.709 mg·kg^-1 in WLLJ. The average Cd content ranged from 0.033 mg·kg^-1 in WYCY to 0.099 mg·kg^-1 in KHLD. The average Pb content ranged from 0.510 mg·kg^-1 in KHLD to 2.763 mg·kg^-1 in DFLJ. Four principal components were obtained from the measured elements by principal component analysis, whose variance contribution rate was 88.159% in the total. Most kinds of teas could find their clusters by cluster analysis, and QDYY were all in cluster 7, while AJWT, HMT and JST were distributed in 4 different clusters.【Conclusion】The quality control is good in the planting, harvesting, processing and storage of top ten teas in Zhejiang province. There were significant differences in ∑ReOs, As, Cr, Cd and Pb among different species of famous teas.

Key words: Zhejiang province, top ten teas, heavy metal, nitric acid-microwave digestion, geographic origin

ZHANG Jian-yang, ZHANG Ying-bin, JIN Shou-zhen, MA Gui-cen, CHEN Li-yan, LIU Xin. Analysis on the Content of Major Heavy Metals in Top Ten Teas from Zhejiang Province[J].Scientia Agricultura Sinica, 2014, 47(19): 3914-3921.

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