Abstract：Objective To investigate the contents of seven harmful elements (including Pb, Cd, Ni, Cr, Hg, As and Al) in tea and tea substitutes sold in the markets in Shaoxing region, and to analyze their pollution levels. Methods We randomly collected 85 tea samples (including 58 green tea samples, 11 black tea samples, 12 oolong tea samples and 4 Puer tea samples) and 158 tea substitutes (including 48 barley tea samples, 73 flower tea samples and 37 broadleaf holly leaf tea samples) from shops and farmers’ markets in Shaoxing region. The contents of seven harmful elements were determined by inductively coupled plasma mass spectrometry with microwave digestion, and then the Results were evaluated according to China Food Safety National Standard for Maximum Levels of Contaminants in Foods (GB 2762-2017) and the Limited Standards of Cr , Cd , Hg , As and F in Tea (NY 659-2003). Results No statistically significant differences were found in the contents of Pb, Cd, Hg and As among the four kinds of tea (P>0.05). The contents of Ni, Cr and Al were found to be respectively the highest in green tea, Puer tea and oolong tea samples, and the medians were 5.59, 0.70 and 1,265 mg/kg respectively. The exceeding standard rates of As in green tea, black tea and oolong tea samples were 20.69%, 18.18% and 16.67% respectively. The contents of Cd, Ni and Al in broadleaf holly leaf tea were the highest in tea substitutes, with the medians of 0.93, 1.72 and 158 mg/kg respectively. The contents of Pb and Cr in flower tea were the highest in tea substitutes, with the medians of 0.31 and 0.19 mg/kg respectively. The exceeding standard rates of As in barley tea, flower tea and broadleaf holly leaf tea were 2.08%, 4.11% and 2.70% respectively. The exceeding standard rates of Pb in barley tea and broadleaf holly leaf tea were 14.60% and 2.70% respectively. The exceeding standard rate of Cd in broadleaf holly leaf tea was 43.2%, with the maximum value being 23.7 mg/kg. Conclusions Special attention should be paid to the pollution of As in tea and Cd in broadleaf holly leaf tea sold in the markets in Shaoxing region. It is necessary to continuously enhance monitoring and find sources of pollution so as to take appropriate control measures.
樊伟, 王晶, 王若燕, 陈理. 绍兴地区市售茶叶及代用茶中有害元素含量调查[J]. 实用预防医学, 2018, 25(9): 1075-1078.
FAN Wei, WANG Jing, WANG Ruo-yan, CHEN Li. Contents of harmful elements in tea and tea substitutes sold in the markets in Shaoxing region. , 2018, 25(9): 1075-1078.
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2018, Vol. 25 
