Assessment of Selenium Bioavailability in Tea Plantation Soil to Bashan Tea Species (Wanyuan, Southwest China) Using Single Extraction Methods

Abstract:

Se concentration varies for different soil types, whether can be absorbed by plants is not related with the total amount of selenium, it is controlled by the bio-availability Se in soil. This paper is aim to look for the laws of the bio-availability Se in different soils, and find out an accuracy and effective method to extract the bio-available Se from different soil types. Digest the soil and tea leaves samples and used six methods (KH₂PO₄, NaHCO₃, HAC, MgCl₂, HCl, EDTA) to extract Se from the different soils, the result was measured by AFS. The mean values of total Se is 8.45μg/g in carbonaceous slates soil, 0.32μg/g and 0.41μg/g in malmstone soil, 0.78μg/g in shale soil. The maximum correlation coefficients (r) between the six extract methods and tea leaves about the extraction ratio of Se in four soils is 0.93188 with KH₂PO₄, 0.77097 and 0.83589 with NaHCO₃, 0.84231 with HAC. So it can be indicate that the total Se contents is carbonaceous slates soil>shale soil>malmstone soil, the best extract method for carbonaceous slates soil, malmstone soil and shale soil are KH₂PO₄, NaHCO₃, and HAC respectively.

• Periodical: Advanced Materials Research (Volumes 955-959)
• Pages: 541-547
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.955-959.541
• Online since: June 2014
• Authors: Xin Kai Zhang, Ze Qin Li*, Xiao Ming Liu
• Keywords: Bio-Availability, Selenium (Se), Single Extraction, Soil, Tea Leaves

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