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Chinese Agricultural Science Bulletin ›› 2017, Vol. 33 ›› Issue (28): 151-157.doi: 10.11924/j.issn.1000-6850.casb16090091

Special Issue: 园艺

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Heavy Metal Concentration in Commercial Tea Samples from Urban Markets

张明明 and 刘文菊   

  • Received:2016-09-20 Revised:2017-09-24 Accepted:2016-11-08 Online:2017-10-24 Published:2017-10-24

Abstract: This study mainly analyzed the concentration of heavy metals in tea products from urban markets using high pressure airtight digestion system, and inductively Coupled Plasma- Mass Spectrometry (ICP-MS) and atomic fluorescence spectrometry. According to theMaximum Levels of Contaminants in Foods (GB 2762- 2012),Residue Limits for Chromium, Cadmium, Mercury, Arsenic and Fluoride in Tea (NY 659-2003), and Green Food-Heber Tea Agricultural Industry Standard of the People''s Republic of China (NY/T 2140-2012), the characteristics of Pb, Cd, Hg and As concentrations in the tea samples collected from markets were determined. The results showed that Pb, Cd, Hg, As concentrations in tea samples ranged from 0.1 to 1.67, 0.0006 to 0.085, 0.00021 to 0.022 and 0.00 to 0.78 mg/kg,respectively. The levels of Pb, Cd, Hg in all tea samples were lower than those safety limitations in the relevant safety standards. However, arsenic concentration in 1.9% of total tea samples exceeded the safety limitation (0.5 mg/kg) inGreen Food-Heber Tea (NY/T2140—2012). All samples with high concentration of As were black tea in bulk. Pb, Cd, Hg, As contentin tea had a certain relevance, correlation analysis showed that there were significant correlations between Pb and As, Hg, Cd, and between Cd and As, too. When selecting the tea on the market, consumers are advised to choose a stereotyped packaging tea, and stereotyped packaging of jasmine tea from Guangxi had high safety coefficient. The quality of bulk tea and that of black tea in the market vary a lot, so the origin, packaging type and price of tea should be taken into consideration to distinguish the quality.

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