文档介绍：茶园土壤中铅形态的连续浸提测定方法研究
石元值1,康孟利2,马立锋1,韩文炎1
(1. 中国农业科学院茶叶研究所,农业部茶叶化学工程重点开放实验室,浙江杭州 310008;2. 浙江大学茶学系,浙江杭州 310029)
摘要:通过改进的连续浸提试验,将高铅茶园土壤及常态茶园土壤中铅的存在形态可分成6种形态:水溶态、可交换态、碳酸盐结合态、铁锰氧化物结合态、有机物结合态和残渣态,并用ICP-OES法检测了各种形态铅含量及总铅含量。结果表明,本提取测定方法精密度和准确性好,而且简便可靠。
关键词:连续浸提;茶园土壤;铅形态;ICP-OES法
中图分类号:+1       文献标识码:A       文章编号:1000—369X(2005)01—023—07
 
An Analysis Method Study of Sequential Extraction and Separation of the Chemical Form of Lead in Tea Garden Soil
SHI Yuan-zhi1, KANG Meng-li2, MA li-feng1, HAN Wen-yan1
(1. Tea Research Institute, Chinese Academy of Agricultural Sciences, Key Lab. Of Tea Chemical Engineering, Ministry of Agriculture, Hangzhou 310008,China; 2. Department of Tea Science, Zhejiang University, Hangzhou 310029, China)
Abstract: With modified sequential extraction and separation analysis method, lead in tea garden was divided into six fractions: water soluble, exchangeable, bound to carbonates, bound to Fe-Mn oxides, bound anic matter, and residual. All the six forms of lead and total lead were determined with ICP-OES, showing that this method has good precision ,accurate, reliable and easy to operate.
Key words: Sequential Extraction, Tea garden soil, Lead form, ICP-OES
 
 
茶叶中铅元素含量问题已日益引起人们的关注,对茶叶中铅的来源也有较多的研究,从目前的研究结果来看,土壤中的铅元素含量是茶叶中铅的一个主要来源[1,2]。铅在土壤—茶树—人体循环中的迁移转化规律、生物效应及其毒理不仅取决于其总浓度,还依赖于其具体的存在形态。但目前对茶园土壤中铅形态的研究报道还很少见,一般认为对茶树造成危害的是有效形态的铅,但对铅形态的研究及有效态铅