茶园土壤-茶树-茶叶-茶汤中镉转移规律及安全性评价  

Transfer Rule and Safety Evaluation of Cadmium in Tea Garden Soil and Tea Tree and Tea Leaf and Tea Liquor

作　　者：刘淑娟[1] 覃事永[1] 罗意[1] 陈莹玉 李维[1] 钟兴刚[1] 谭正初[1] LIU Shu-juan;QIN Shi-yong;LUO Yi;CHEN Ying-yu;LI Wei;ZHONG Xing-gang;TAN Zheng-chu(Tea Research Institute,Hunan Academy of Agricultural Science,Hunan Branch of National Tea Tree Improvement Center,Scientific Observation and Experiment Station of Tea Tree and Tea Processing,Ministry of Agriculture,Changsha 410125,China)

机构地区：[1]湖南省农业科学院茶叶研究所,国家茶树改良中心湖南分中心,农业部茶树及茶叶加工科学观测实验站,湖南长沙410125

出　　处：《茶叶通讯》2020年第1期52-57,共6页Journal of Tea Communication

基　　金：湖南省农业农村厅项目(湘财农指[2019]33号);湖南省重点研发计划(2018NK2033)。

摘　　要：为论证镉污染土壤种植茶树的安全性与可行性,通过盆钵茶园试验研究了湖南9个主栽茶树品种在不同镉含量土壤中对镉的吸收积累特性和茶汤中镉元素的浸出率。结果表明,在pH值4.1的土壤中,通过根系吸收的镉元素从根系到主干,再到侧枝枝干和茶树叶片的转运过程中,各器官的镉含量依次递减,茶树嫩芽(叶)中镉的富集系数仅0.13~0.24;茶树种植在土壤镉含量低于3.0 mg/kg的土壤中,茶叶没有出现镉超标现象;镉元素在茶汤中的平均浸出率为9.87%,利用膳食暴露风险评估模型对茶叶和茶汤中的镉含量进行风险评估,表明供试茶叶样品中的镉不会对人体健康产生威胁。In order to demonstrate the safety and feasibility of planting tea trees in cadmium polluted soil,the absorption and accumulation characteristics of cadmium and the leaching rate of cadmium in tea liquor of nine main tea varieties in Hunan Province were studied by pot tea garden experiment.The results showed that:in the pH 4.1 soil,the cadmium absorbed by the roots decreased from the roots to the trunk,then to the lateral branches and leaves,and the cadmium concentration coefficient of tea shoots(leaves)was only 0.13~0.24,when tea trees were planted in the soil with the cadmium content lower than 3.0 mg/kg,the cadmium content of tea did not exceed the standard.The tea brewing experiment showed that the average leaching rate of cadmium in tea liquor was 9.87,and the risk assessment model of dietary exposure was used to assess the cadmium content in tea and tea liquor,which showed that the cadmium in tea samples did not pose a threat to human health.

关 键 词：茶树 镉 迁移 风险评估 

分 类 号：TS272[农业科学—茶叶生产加工] S571.1[轻工技术与工程—农产品加工及贮藏工程]