Scale and causes of lead contamination in Chinese tea

文献类型： 外文期刊

第一作者： Han, WY

作者： Han, WY;Zhao, FJ;Shi, YZ;Ma, LF;Ruan, JY

作者机构：

关键词： Pb contamination;tea;human intake;atmospheric deposition;NEW-ZEALAND;CADMIUM;CROPS;SOILS;SPECIATION;POLLUTION;ELEMENTS;WHEAT

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： We investigated the scale and causes of Pb contamination in Chinese tea. Lead concentrations in 1225 tea samples collected nationally between 1999 and 2001 varied from < 0.2 to 97.9 mg kg(-1) dry weight (DW), with 32% of the samples exceeding the national maximum permissible concentration (MPC) of 2.0 mg kg(-1) DW and a significant difference between tea types. There was an increasing trend in tea Pb concentration from 1989 to 2000. Proximity to highway and surface dust contamination were found to cause elevated Pb concentrations in tea leaves. Furthermore, Pb concentration in tea leaves correlated significantly and positively with soil extractable Pb, and negatively with soil pH, suggesting that root uptake of Pb from soils also contributed to Pb accumulation in tea. Potential contributions to human Pb intake from drinking tea were small at the median or national MPC Pb values, but considerable at the highest concentration found in the study. (c) 2005 Elsevier Ltd. All rights reserved.

分类号： X5

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