NDLI: Application of Pb isotopic tracing technique to constraining the source of Pb in the West Lake Longjing tea

Content Provider	Springer Nature Link
Author	Lu, Yuanfa Yang, Hongmei Ma, Liyan Chen, Xiqing Wang, Qunying
Copyright Year	2011
Abstract	This paper dealt with the Pb contents and Pb isotopic composition of the West Lake Longjing tea. The results showed that in the tea leaves, from young leaf →old leaf →tea limb, the Pb contents tend to increase gradually from 1.63 →4.84 →6.07×10$^{−6}$, wich revealed that the Pb was accumulated gradually in the tea. After cleaned, the Pb contents of tea leaves were significantly reduced. This indicated that the deposits on the surface of tea leaves made a great contributuion to Pb contents. The survey results for soils in the relevant tea gardens showed that soil from the Longjing tea garden has higher Pb contents, with an average level of 49.6×10$^{−6}$, two times those of common soils (24×10$^{−6}$) in China. Results of the systematic analysis for tea, tea garden soil and the samples with the relevant background of the Pb isotopic composition displayed that the Pb isotopic ratio of tea is $^{206}$Pb/$^{207}$Pb=1.164±0.005 (2σ). The ratio of $^{206}$Pb/$^{207}$Pb for the soil gradually decreased from residue phase, soil dilute acid extract phase, and then to urban topsoil, i.e., 1.175 →1.171 →1.170. The $^{208}$Pb/($^{206}$Pb+$^{207}$Pb) ratios also show a similar variation trend. $^{206}$Pb/$^{207}$Pb ratios in the samples with the relevant background were: vehicle exhaust, 1.124; coal-combustion, 1.156; atmosphere, 1.168; and water, 1.166. Comparative studies have shown that Pb pollution is popular in the environmental media (soil, atmosphere, water) in Hangzhou. With the aggravation of Pb pollution, the Pb isotopic composition gradually changed from the natural background (soil residues) to the direction of automobile exhaust. This phenomenon could illustrate that the pollution source was the vehicle exhaust, while the coal-combustion contributed little to environmental pollution in Hangzhou. The Pb of the Longjing tea came mostly from soluble phase Pb in the polluted soil. Moreover, secondary pollution was caused by vehicle exhaust.
Starting Page	554
Ending Page	562
Page Count	9
File Format	PDF
ISSN	10009426
Journal	Chinese Journal of Geochemistry
Volume Number	30
Issue Number	4
e-ISSN	19930364
Language	English
Publisher	SP Science Press
Publisher Date	2011-10-20
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Longjing tea Pb isotope Pb source Hangzhou West Lake Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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