原子吸收法检测3种茶叶中重金属元素的含量

天然产物研究与开发 ›› 2018, Vol. 30 ›› Issue (增刊1): 112-118.

原子吸收法检测3种茶叶中重金属元素的含量

吴恒，车敏娜，热孜万古力·赛买提，张晨，田晓静,刘翊中，陈士恩*

西北民族大学生命科学与工程学院,兰州 730124

出版日期:2018-07-31 发布日期:2018-07-31
基金资助:
国家科技支撑计划（2015BAD29B05）；国家民委专项综合改革试点（10019141）；西北民族大学武陵山片区精准扶贫科研项目（31920180001）

Determination of Heavy Metal Elements in Three Kinds of Tea by Atomic Absorption Spectrometry

WU Heng, CHE Min-na, RE Ziwanguli·Saimaiti, ZHANG Chen, TIAN Xiao-jing, LIU Yi-zhong, CHEN Shi-en*

College of Life Science and Engineering,Northwest Minzu University,Lanzhou 730124,China

Online:2018-07-31 Published:2018-07-31

摘要/Abstract

摘要： 以市售红茶、绿茶、减肥茶3种茶叶为研究对象，选取西北民族大学榆中校区宿舍自来水、实验室自来水、校外民居自来水、3种市售包装饮用水6种水样，分别泡制3种茶叶的6种不同水样的浓茶水、淡茶水，检测3种茶叶以及茶水中的重金属元素Zn、Te、Sn、Cd和 Pb 的含量。3种茶叶样品经湿法消化处理，同6种水样分别超声处理后，采用空气-乙炔火焰法（原子吸收法）在仪器最佳工作条件下测定各样品中5种重金属元素的含量。结果表明，红茶和绿茶中Te和Sn 均有检出，有毒重金属Pb 和Cd含量均低于GB 2762—2017标准限值，Zn含量较高；减肥茶中Te和Sn 未检出，Pb和Cd含量严重超标，Zn含量也相对较高；6种不同水样泡制的浓茶水和淡茶水中重金属含量不尽相同；西北民族大学榆中校区2种自来水样及周边民居自来水中Zn、Te、Sn、Cd和Pb元素均有检出，且Cd含量略微超标；市售包装应用水2（纯净水）和 3（矿泉水）中未有Te元素检出，其他4种微量元素3种饮用水均有检出；6 种水样中均有Pb检出（略有超标），其它元素均在正常范围内；试验重复性和仪器精密度良好，加标回收率为94.53%~108.56%.可知，本研究所检测的3种茶叶重金属元素含量各不相同，且茶水重金属元素含量与水质有关，同时3种市售饮用水水质较好，3 种自来水水质不等，不建议直接饮用本地自来水。

关键词: 原子吸收法, 自来水, 饮用水, 茶叶, 重金属元素

Abstract: Taking the commercial black tea,green tea and slimming tea as the research object,six kinds of water samples from dormitory water,laboratory tap water and water from outside the school in Yuzhong Campus of Northwest University for Nationalities were selected.6 kinds of tea samples of different water samples of concentrated tea,light tea,tea leaf tea and tea in the detection of heavy metal elements Zn,Te,Sn,Cd and Pb content.Three kinds of tea samples were digested by wet method,and the other six kinds of water samples were sonicated respectively.The content of five heavy metal elements in each sample was determined by air-acetylene flame method (AAS) under the best working condition of the instrument.The results showed that both Te and Sn in black tea and green tea were detected,the content of toxic heavy metals Pb and Cd were lower than the standard limit of GB 2762-2017,and the content of Zn was higher.Te and Sn were not detected in slimming tea,and Pb and Cd The content of Zn was relatively high,and the content of Zn was also relatively high.The contents of heavy metals in concentrated tea and light tea brewed by 6 different water samples were different.The contents of Zn,Te,Sn,Cd and Pb were detected,and the content of Cd was slightly exceeded.No Te element was detected in the commercial packaging water 2 (pure water) and 3 (mineral water),and the other 4 trace elements All of the six water samples were detected by Pb (slight over standard),the other elements were within the normal range;the repeatability of the test and the precision of the instrument were good with the recoveries of 94.53% -108.56%.The contents of heavy metal elements in three kinds of tea tested in this research were different,and the contents of heavy metal elements in tea were related to water quality.Meanwhile,the quality of three kinds of commercial drinking water was good and the quality of three kinds of tap water was not equal.Drinking tap water was not recommended.

Key words: atomic absorption method, tap water, drinking water, tea, heavy metal element

中图分类号: S571.1 TS272

吴恒, 车敏娜, 热孜万古力·赛买提, 张晨, 田晓静, 刘翊中, 陈士恩. 原子吸收法检测3种茶叶中重金属元素的含量[J]. 天然产物研究与开发, 2018, 30(增刊1): 112-118.

WU Heng, CHE Min-na, RE Ziwanguli·Saimaiti, ZHANG Chen, TIAN Xiao-jing, LIU Yi-zhong, CHEN Shi-en. Determination of Heavy Metal Elements in Three Kinds of Tea by Atomic Absorption Spectrometry[J]. NATURAL PRODUCT RESEARCH AND DEVELOPMENT, 2018, 30(增刊1): 112-118.

[1]	冯忠娟, 曹瑞, 王芝慧, 王怀宾, 侯建峰, 梁裕华, 李旭清, 束良佐, 沈燕, 杨万勤. 天台山云雾茶有效成分随生态技术模式和季节的变化[J]. 天然产物研究与开发, 2023, 35(增刊1): 103-109.
[2]	王豪, 王委, 刘艳芳, 郭志谋, 王超然. 普洱大叶茶中对褪黑素受体具有激动作用的活性化合物[J]. 天然产物研究与开发, 2022, 34(6): 1021-1026.
[3]	何泉泉1*，熊智1，郑希1，余昊阳1，延在昊1，邹伟杰2，王思蓓2，张依2，罗建光2. 山茶叶子的化学成分及其抗氧化活性研究[J]. 天然产物研究与开发, 2019, 31(增刊2): 71-74.
[4]	张朵1，闫荣玲1，罗志威1，黄湘豫1，闫江涛2，廖阳1. 山茶花花粉中稀土与重金属元素含量及花粉多糖的提取与生物活性研究[J]. 天然产物研究与开发, 2019, 31(8): 1418-1424.
[5]	车敏娜，吴恒，热孜万古力·赛买提，田晓静，郑棱峻，王国威，武中庸，陈士恩*. 原子吸收法测定饮用水和自来水中重金属元素的含量[J]. 天然产物研究与开发, 2017, 29(增刊2): 317-320.
[6]	许子竞*，石谦，罗树常. 金花茶叶多糖的分离纯化及组成分析[J]. 天然产物研究与开发, 2017, 29(7): 1148-1153.
[7]	黄飞1*，徐慧敏1，王杰1，黄涛1，黄成相1，吴孔林2. Box-Behnken设计-效应面法优化离子液体提取废次茶叶中咖啡因工艺[J]. 天然产物研究与开发, 2017, 29(3): 489-496.
[8]	曲伟1，刘庄1，张照康2，程湘懿2，范海涛3,4*. 毛尖茶叶多糖的提取分离及其活性测定[J]. 天然产物研究与开发, 2016, 28(8): 1262-1265.
[9]	杨建英1,2，郭小权3，肖莉春1,3，黄名钱1,3，孔祥峰1*. 茶叶水提物对猪源耐药大肠杆菌的抑制作用[J]. 天然产物研究与开发, 2016, 28(12): 1959-1964.
[10]	曲伟1，王孟君1，于海燕3，刘钰3，田旭东3，范海涛2,3,4*. 毛尖茶叶多糖及其结合物的抗氧化活性研究[J]. 天然产物研究与开发, 2015, 27(2): 210-213.
[11]	王国凯，郑娟，郁阳，刘劲松，王诤，蔡百祥，王刚*. 马兰重金属元素ICP-MS及主成分聚类分析[J]. 天然产物研究与开发, 2015, 27(12): 2084-2089.
[12]	周琼琼1，孙威江1,2*. 代谢组学技术及其在茶叶研究中的应用[J]. 天然产物研究与开发, 2015, 27(10): 1821-1826.