Isotope tracers for lead and strontium sources in the Tieguanyin tea garden soils and tea leaves.

Author(s) Sun, J.; Yu, R.; Yan, Y.; Hu, G.; Qiu, Q.; Jiang, S.; Cui, J.; Wang, X.; Ma, C.
Journal Chemosphere
Date Published 2020 May
Abstract

The concentrations of Pb & Sr in Tieguanyin tea leaves and soils from 15 tea gardens of Anxi, China, were determined and the sources of Pb & Sr in soil and leaf samples were analysed using isotope tracing technology. The results showed pH in soils had significant correlations to both acid-extractable Pb & Sr in soils and new leaves. The Pb concentration in leaves was significantly lower than that in soils, especially the acid-extractable Pb in soils. The low Bio-concentration Factor (BCF) indicated the bioavailable Pb in soils could not easily be transferred to leaves. The contribution rates of parent material were 61%-100% and 45%-100% for total Pb isotope and acid-extractable Pb isotope in soils, respectively, indicating a low impact of human activity. A sizeable influence of parent material for leaves was also observed, suggesting that Pb may be present in the dust-fall. Although Sr concentrations in leaves were not high, they exceeded that in soils. The high BCF also indicated that tea has a high capacity to accumulate Sr, with the coincidence that Sr/Sr in the acid-extractable isotope in soils were similar to new leaves. A Pb-Sr joint tracer indicated that Sr in old and new leaves may be influenced by parent material and anthropogenic sources, respectively.

DOI 10.1016/j.chemosphere.2019.125638
ISSN 1879-1298
Citation Sun J, Yu R, Yan Y, Hu G, Qiu Q, Jiang S, et al. Isotope tracers for lead and strontium sources in the Tieguanyin tea garden soils and tea leaves. Chemosphere. 2020;246:125638.