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The relationship of lead concentration between soils and tea leaves and the critical value of lead for soil in Anxi, Fujian Province |
ZHOU Guo-Hua, SUN Bin-Bin, HE Ling, BAI Jin-Feng, ZENG Dao-Ming, HOU Shu-Jun, LIU Zhan-Yuan |
Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China |
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Abstract Top (0~20 cm)and sub-layer (20~40 cm)soil samples as well as corresponding tea leaf samples were collected at seventy-nine tea gardens in Anxi County and other areas, Fujian Province. Lead concentrations of tea leaves as well as soil geochemical indicators including macro-and micro-elements were determined. There is a significant correlation between the lead concentration of tea leaves and that of the corresponding soils. Therefore, a linear regression model was established, and transfer factors(Ft) for lead from soils to tea leaves was calculated. It seems that Ft values are affected by the concentrations of lead, manganese, phosphorus and zinc in soils. The critical value of soil lead for tea production was derived from the regression model and Ft value according to tea quality criteria. The result demonstrates that the lead values of tea uptake from soils would not exceed tea quality criteria (5×10-6) under normal soil lead concentration. Multivariable linear regression model can preferably explain the relationship between lead concentration in tea leaves and soil physicochemical indicators.
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Received: 07 April 2015
Published: 10 February 2016
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