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- W1972906916 abstract "The utilization of birch sap as sampling medium for biogeochemical prospecting for mineral deposits was studied in an orientation survey. Factors affecting the sampling procedure, such as daily and seasonal variations in the sap composition, were thoroughly tested, as well as the influence of sampling from twigs at different directions and heights of the same tree and from different trees in an area with homogeneous bedrock. The quantification of the major and trace elements was performed with direct current plasma atomic emission spectrometry (DCP-AES) and electrothermal atomic absorption spectrometry (ETAAS). About 15 elements were analyzed in the sap studies. Ca, Mg, P, Mn and Zn are the most abundant elements in birch sap, their concentrations exceeding 1 mg l−1. For the biogeochemical orientation survey, about 40 sap samples were taken from different birch trees, mainly Betula verrucosa Ehrh., during spring seasons between 1978 and 1987 and were analysed for trace elements such as Cu, Cd, Pb, Ag and Zn. The sampled birches grew in a pine-dominated forest on, and in the vicinity of, a polymetallic lead-zinc-silver sulphide deposit at Attu in southwestern Finland. A significant Pb-Zn-Ag-Cd anomaly was observed above the sulfide deposit suggesting the potential use of birch sap as a tool for biogeochemical prospecting." @default.
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- W1972906916 date "1990-07-01" @default.
- W1972906916 modified "2023-09-27" @default.
- W1972906916 title "Birch sap as a tool for biogeochemical prospecting" @default.
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- W1972906916 doi "https://doi.org/10.1016/0375-6742(90)90108-m" @default.
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