本文選題：磚茶 + 重金屬��； 參考：《衛(wèi)生研究》2017年05期

【摘要】：目的了解中國(guó)茶葉主產(chǎn)區(qū)磚茶中鉛(Pb)、硒(Se)、砷(As)和汞(Hg)等元素的含量,評(píng)估長(zhǎng)期飲用磚茶人群Pb、Se、As和Hg元素的暴露水平。方法在內(nèi)蒙古、甘肅、新疆、青海、四川、西藏和云南等習(xí)慣飲用磚茶的地區(qū)收集了31份不同產(chǎn)區(qū)的磚茶樣品,用等離子發(fā)射光譜法測(cè)定磚茶Pb含量,氫化物發(fā)生原子熒光光譜法測(cè)定磚茶中As、Se和Hg含量并進(jìn)行評(píng)價(jià)。結(jié)果磚茶中Pb、Se、As及Hg的含量均值分別為6.232、0.219、0.524和0.0215 mg/kg。依據(jù)GB 2762—2012中茶葉Pb的限量標(biāo)準(zhǔn)評(píng)價(jià),磚茶Pb超標(biāo)現(xiàn)象較為突出,不同產(chǎn)地磚茶Pb含量差異明顯,含量最低為云南所產(chǎn)沱茶和普洱茶,平均含量為1.337 mg/kg,浙江所產(chǎn)茯磚Pb含量亦較低,為4.303 mg/kg,符合限量標(biāo)準(zhǔn),Pb含量最高為四川所產(chǎn)康磚,含量達(dá)9.998 mg/kg。所測(cè)磚茶As、Hg含量均符合NY 659—2003中規(guī)定的限量標(biāo)準(zhǔn)。采用聯(lián)合國(guó)糧農(nóng)組織和世界衛(wèi)生組織食品添加劑聯(lián)合專(zhuān)家委員會(huì)(JECFA)暫定的每周污染物耐受攝入量(PTWI)評(píng)價(jià)表明,長(zhǎng)期飲用磚茶人群通過(guò)磚茶平均攝入的Pb、As和Hg對(duì)PTWI的貢獻(xiàn)率分別為13.63%、1.71%和0.29%,均在安全范圍之內(nèi);通過(guò)磚茶每日攝入的Se為0.188μg,對(duì)人群硒膳食推薦攝入量(RNI)的貢獻(xiàn)率僅為0.38%。結(jié)論中國(guó)主要磚茶存在Pb超標(biāo)現(xiàn)象,長(zhǎng)期飲用磚茶人群As、Hg處于低暴露水平,飲用磚茶對(duì)補(bǔ)充體內(nèi)Se的生理需要作用有限。
[Abstract]:Objective to investigate the contents of Pb, se, as and Hg in brick tea in the main tea producing areas of China, and to evaluate the exposure levels of Pb, as and Hg in the population of brick tea drinking for a long time. Methods 31 samples of brick tea from different producing areas were collected in Inner Mongolia, Gansu, Xinjiang, Qinghai, Sichuan, Tibet and Yunnan. The Pb content of brick tea was determined by plasma emission spectrometry. The content of As-se and Hg in brick tea was determined by hydride generation atomic fluorescence spectrometry and evaluated. Results the average contents of PbSe, as and Hg in brick tea were 6.232 and 0.0215 mg / kg, respectively. According to the limited standard evaluation of Pb in tea of GB2762-2012, the phenomenon of Pb exceeding the standard is obvious, the content of Pb in brick tea from different producing areas is obviously different, and the lowest content is Tuo tea and Pu'er tea produced in Yunnan Province. The average content of Pb was 1.337 mg / kg, and the content of Pb in Fuzhuan brick from Zhejiang Province was also low, 4.303 mg / kg. The highest content of Pb in conformance to the limited limit was that of the healthy brick produced in Sichuan province, with a content of 9.998 mg / kg. The content of Ash Hg in brick tea is in accordance with the limit standard stipulated in NY 659-2003. A tentative weekly pollutant tolerance intake (PTWI) evaluation using the Joint expert Committee on Food Additives of the Food and Agriculture Organization of the United Nations and the World Health Organization (JECFAA) shows that, The contribution rates of PBas and Hg to PTWI were 13.63% 1.71% and 0.29%, respectively, which were within the safe range, and the se intake through brick tea daily was 0.188 渭 g, and the contribution rate to the recommended dietary intake of selenium was only 0.38%. Conclusion there is Pb excess in the main brick tea in China, the long-term drinking brick tea population is in low exposure level, drinking brick tea to supplement the physiological needs of se is limited.
【作者單位】： 中國(guó)科學(xué)院地理科學(xué)與資源研究所"陸地表層格局與模擬"院重點(diǎn)實(shí)驗(yàn)室中國(guó)科學(xué)院大學(xué)資源與環(huán)境學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(No.41671500,41230749)
【分類(lèi)號(hào)】：R155.3
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本文編號(hào)：1825137