Biogeochemistry, regional sampling
Description
The product contains information about different elements in brookwater plants as well as pH in running water. Analytical results are presented using different analytical methods, both total and acid lactic levels have been determined. The product is the direct result of many years of geochemical mapping software. Geochemical mapping at SGU is mainly conducted for the purpose of showing the natural occurrence of major substances and trace elements in aquatic plants as well as pH in water. In regional biogeochemical mapping, brookwater plants such as various Carex species (roots), Filipendula ulmaria (roots) and Fontinalis antipyretica (whole plant) were sampled and analysed. Plants were collected from smaller streams with a sample density of 1 sample per 7 km2. The brookwater plants (roots) and moss are considered to be sample media that, without separation, absorb trace elements and therefore reflect the brookwater chemistry. Breeding aquatic plants are exposed to both natural and anthropogenic influences. Due to chemical weathering processes, metal concentrations in stream water indicate the chemical composition of surrounding bedrock and soil. The exchange of metals between water and plant roots is a slow process that does not seem to be affected by seasonal fluctuations. It can be estimated that biogeochemical samples show bioavailable metal concentrations in aquatic plants. The main and trace elements i analysed in plant samples originate from the living roots and leaf moss, as well as from minerogenic materials and iron-manganese hydroxides associated with the plant. Other geochemical sources, such as humus particles, are considered to be of minor importance. The plant samples have been analysed on 30 elements with X-ray fluorescence (XRF), where Al, As, Ba, Ca, Cl, Co, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Ni, P, Pb, Rb, S, Si, Sr, Ti, U, V, W, Y, Zn and Zr have given sufficient analytical quality to be used for interpretation. A subset of samples has also been analysed on Hg, Cd, Se, Au, Sb, Bi and Tl with acidification combined with atomic absorption spectrometry (AAS) and inductively coupled plasma mass spectrometry (ICP-MS). Results from fourteen elements (As, Cd, Co, Cr, Cu, Hg, Mo, Ni, Pb, Se, U, V, W and Zn) have been regularly published on SGU in the form of reports, maps and databases. The test results show how dispersal patterns of different elements in watercourses vary within the country. Variation is due both to the natural addition of soils and bedrock and to the addition of various sources of pollution.
Resources
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https://api.sgu.se/oppnadata/biogeokemi-regional/ogc/features/v1 |
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https://resource.sgu.se/service/wms/130/biogeokemi-regional? |
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https://resource.sgu.se/data/oppnadata/biogeokemi-regional/biogeokemi-regional.zip |
Tags
- sveriges-geologiska-undersökning
- nationell
- öppna-data
- jordobservation-och-miljö
- hvd