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| 西湖茶园茶叶铅污染铅同位素示踪 | |
| 引用本文： | 郦逸根,路远发.西湖茶园茶叶铅污染铅同位素示踪[J].物探与化探,2008,32(2):180-185. |
| 作者姓名： | 郦逸根 路远发 |
| 作者单位： | 1. 上海申丰地质新技术应用研究所有限公司,上海,201107 2. 宜昌地质矿产研究所,湖北,宜昌,443003 |
| 基金项目： | 中国地质调查局地质调查项目 |
| 摘 要： | 通过对西湖茶园的植物和土壤样品进行一系列的调查,以着力寻找茶叶的铅污染源。利用铅同位素技术对西湖茶园的土壤、茶叶和城区的燃煤、大气气溶胶、汽车尾气进行铅同位素示踪研究。研究表明,茶园土壤铅物质的可溶相具同源性和残查态偏于多源性。清洗后的茶叶铅含量显著降低,但其同位素组成不发生明显改变,显示出茶叶中的铅与叶面空气沉降物中的铅同源。不同介质铅同位素对比值平均值呈现表土、大气(气溶胶)、煤的w(206Pb)/w(207Pb)与茶叶趋于相近,汽油低之;表土、大气(气溶胶)、汽油的w(208Pb)/〔w(206Pb)+w(207Pb)〕与茶叶趋于相近,煤略高之。不同区域茶叶铅物质具同源性,与种植的农业地质背景无关。在煤燃烧、气化过程中,Pb进入大气,通过大气沉降或被茶树吸收或附着在茶叶叶面;汽车尾气的排放是茶树铅污染的重要原因之一。 |
| 关 键 词： | 茶叶 铅污染 铅同位素 西湖茶园 |
| 文章编号： | 1000-8918(2008)02-0180-06 |
| 收稿时间： | 2006-04-11 |
| 修稿时间： | 2006年4月11日 |
LEAD ISOTOPES AS A TRACER OF TEA Pb CONTAMINATION IN THE WEST LAKE TEA PLANTATION |
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| LI Yi-gen,LU Yuan-fa.LEAD ISOTOPES AS A TRACER OF TEA Pb CONTAMINATION IN THE WEST LAKE TEA PLANTATION[J].Geophysical and Geochemical Exploration,2008,32(2):180-185. | |
| Authors: | LI Yi-gen LU Yuan-fa |
| Institution: | 1. Shanghai Shenfeng Institute of Novel Geological Techniques Co., Ltd., Shanghai 201107, China; 2. Yichang Institute of Geology and Mineral Resources, Yichang 443003, China |
| Abstract: | A series of field investigations and tea collections were conducted in the West Lake Tea Plantation of Hangzhou. The authors aimed to search for the main source of Pb contamination by measuring Pb isotope compositions in soils, tea, coal, automobile exhausts, and aerosols. The results show that the dissoluble lead is homogenous whereas the residual lead is heterogenous. Lead content of the rinsed tea decreases evidently, whereas Pb isotope compositions do not vary significantly. In addition, Pb in tea is derived from the same source as that in the atmospheric deposition. The 206Pb/207Pb ratio in topsoils, aerosols and coals is similar to that in tea. At the same time, the 208Pb/(206Pb+207Pb) ratio in topsoils, aerosols and gasoline is similar to that in tea, but the Pb content of coals is somewhat higher. Lead in tea is homogenous and has nothing to do with the background values of different tea plantations. The adsorption and uptake of lead by tea are completed by atmospheric deposition in the process of coal gasification and combustion. In addition, the automobile exhaust is one of the main sources of lead contamination. |
| Keywords: | tea Pb contamination Lead isotope West Lake Tea Plantation |
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