PDF《茶叶中镉、铅、砷的浸出规律及快速测算方法研究》

现代食品科技 Modern Food Science and Technology 2019, Vol.

35, No.2

259 茶叶中镉、铅、砷的浸出规律及快速测算方法研究 陶泽红,张明洲,郝培应 (中国计量大学生命科学学院,浙江杭州 310018) 摘要:为明确茶叶中镉、铅、砷的浸出规律,探索茶叶中相应重金属元素的快速测算方法,分别采用微波消解和沸水浸提方法 进行前处理,运用电感耦合等离子体质谱仪(ICP-MS)测定了茶叶、茶水和茶渣中的镉、铅、砷的含量,研究了

3 种元素的浸出规 律及快速测算方法.结果表明,所测茶叶中镉、铅、砷的含量均未超过国家限定标准.在本研究提取条件下,镉、铅、砷三种元素在 浸提

20 min 茶水中的含量与其在茶叶中的含量均呈线性关系,镉的线性方程为 Y=7.40623X+0.0235(r=0.9999) ,铅的线性方程为 Y=5.44998X+0.03008(r=0.9935) ,砷的线性方程为 Y=2.25405X+0.01115(r=0.9822) .因此,可以通过测定茶水中的镉、铅、砷含量 来评估茶叶中的镉、铅、砷总量,以实现对茶叶中镉、铅、砷含量的快速测算;

本研究明确了镉、铅、砷的浸出规律,提供了一种快 速提取和检测茶叶镉、铅、砷含量的新方法. 关键词:茶叶;

镉;

铅;

砷;

浸出规律;

快速测算 文章篇号: 1673-9078(2019)02-259-263 DOI: 10.13982/j.mfst.1673-9078.2019.2.036 The Leaching Rules and Rapid Measurement of Cadmium, Lead and Arsenic in Tea TAO Ze-hong, ZHANG Ming-zhou, HAO Pei-ying (College of Life Sciences, China Jiliang University, Hangzhou 310018, China) Abstract: In order to clarify the leaching regularity of cadmium (Cd), lead (Pb) and arsenic (As) in tea, and to explore a fast method for measuring these heavy metals, microwave digestion and boiling water leaching was used for pre-treatment. Then the content of Cd, Pb and As in tea water, tea residue and tea was determined by inductively coupled plasma mass spectrometer (ICP-MS), respectively, to explore the leaching rules of these three elements and develop a rapid determination method. The results showed that the content of Cd, Pb and As in tea did not exceed the corresponding national standard of China. Under the extraction conditions in this study, the contents of Cd, Pb and As in tea water soaked

20 minutes all have a linear relationship with those in tea, and the linear equation of Cd, Pb and As is, Y=7.40623X+0.0235 (r=0.9999), Y=5.44998X+0.03008 (r=0.9935), and Y=2.25405X+0.01115 (r=0.9822), respectively. Therefore, the total amount of Cd, Pb and As in tea can be assessed by measuring the content in tea water, fulfilling the rapid measurement of Cd, Pb and As in tea. This study clarified the leaching rules of Cd, Pb and As in tea, and provided a method for rapid pre-treatment and determination of Cd, Pb and As in tea. Key words: tea;

cadmium;

lead;

arsenic;

leach law;

rapid measurement 茶被誉为"世界三大天然饮料之一"[1] .茶叶中 富含多种活性成分,具有清热解暑、抗氧化、抗疲劳 等功效[1,2] . 随着现代工业的发展, 环境污染不断加重, 茶叶重金属污染问题也日益受到关注.重金属可以在 食物链中不断富集, 进入人体后能和蛋白质/酶等发生 强烈的相互作用,使其失去活性,并可能造成器官慢 收稿日期:2018-09-06 基金项目:国家重点研发计划项目(2017YFF0210200);

浙江省公益技术应 用研究(分析测试)计划项目(2017C37092) 作者简介:陶泽红(1997-) ,女,研究助理,研究方向:食品安全与检测 通讯作者:郝培应(1975-) ,男,博士,副教授,研究方向:食品安全与检 测 性中毒.镉、铅、砷是对人体危害较大的几种重金属,