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.
[1] Mineharu Y, KoizumiA, WadaY,et al. Coffee,green tea,black tea and oolong tea consumption and risk of mortality from cardiovasular disease in Japanese men and women[J].J Epidemiol Community Health,2011,65(3):230-240. [2] JacobSA, Khan TM, Lee LH . The Effect of green tea consumption on prostate cancer risk and progression:A systematic review[J].NutrCancer,2017,69(3):353-364. [3] 郑国建,高海燕.我国茶叶产品质量安全现状分析[J].食品安全质量检测学报,2015,6(7):2869-2872. [4] 陈富桥,胡林英,姜爱芹,等.城市居民茶叶质量安全风险认知与处理策略调查研究[J].食品安全质量检测学报,2017,8(5):1914-1919. [5] 王文伟,骆和东,周娜,等.福建省地产茶叶中14种元素的分析与研究[J].中国食品卫生杂志,2011,23(3):265-269. [6] 周娜,白艳艳,王文伟,等.福建省地产茶叶中微量元素含量的分析[J].实用预防医学,2014,21(9):1025-1027. [7] Zhong WS,Ren T, Zhao LJ. Determination of Pb(Lead), Cd(Cadmium), Cr(Chromium), Cu(Copper), and Ni(Nickel) in Chinese tea with high-resolution continuum source graphite furnace atomic absorption spectrometry[J].J Food Drug Anal,2016,24(1):46-55. [8] Nkansah MA,Opoku F,Ackumey AA.Risk assessment of mineral and heavy metal content of selected tea products from the Ghanaian market[J].Environ Monit Assess,2016,188(1):1-11. [9] 刘艳丽,今孝芳,曹丹,等.茶树铝、氟富集研究进展[J].植物科学学报,2016,34(6):972-977. [10] 洪欣,梁晓曦,苏荣,等.茶叶中金属元素含量的测定及其浸出特性的研究[J].中国卫生检验杂志,2016,26(14):2015-2019. [11] 吴龙,张力群,龚立科,等.茶叶及代用茶中多元素检测结果分析[J].中国卫生检验杂志,2017,27(7):1025-1028. [12] 李汉敏,陈岩,耿安静,等.2种苦丁茶中重金属及稀土元素含量调查分析[J].食品安全质量检测学报,2017,8(5):1727-1733. [13] 梁雪金.膳食铝暴露评估及食品中铝限量安全标准研究进展[J].实用预防医学,2016,23(2):254-257. [14] 李青,刘思洁,方赤光.食品中铝含量及其危害研究进展[J].食品安全质量检测学报,2016,7(1):14-19. [15] 周娜,白艳艳,王文伟,等.福建省不同品种茶叶中重金属元素含量的调查分析[J].中国卫生检验杂志,2014,24(13):1948-1950. [16] Lu K,Meng T,Ting Z,et al.Nickel nanoparticles exposure and reproductive toxicity in healthy adult rats[J].Int J Mol Sci,2014,15(11):21253-21269. [17]Achudume AC, Owoeye D.Quantative assessment of heavy metals insome tea marketed in Nigeria[J].Health,2010,2(9):1097-1100.