Strontium
Alkaline earth metal with high reactivity that occurs naturally only in compounds with other elements
Strontium (Sr) is a ubiquitous metal. Due to its high chemical reactivity, it occurs naturally only in compounds with other elements. Most common are Sr-sulfate (celestine) and Sr-carbonate (strontianite). The concentration of strontium in ocean water is about 8 mg/L.
Commercial uses of strontium and especially its compounds include those in electronical- and electrical industry (e.g. as component of fluorescence substances, batteries, electrical capacitors, and optical devices), in glass industry, metalworking industry, pyrotechnics and in medicine. In tooth-pastes strontium chloride is used to reduce the temperature sensitivity of teeth.
Furthermore, it is used as tracer in archaeology and geology.
Strontium enters the environment during weathering of rocks and anthropogenic activities. It is found in the atmosphere, in soils and water where it is partly dissolved.
Strontium is taken up by plants. Humans are exposed to strontium via air, water and food.
Most strontium compounds are not toxic. Inside the organism strontium behaves like calcium and is incorporated in bones and teeth. Whereas the stable isotopes of strontium normally pose no health threat, incorporated radioactive 90Sr which is present in radioactive fall-out after nuclear explosions and nuclear accidents may lead to cancer and is thus classified as carcinogenic. The half-life of 90Sr is 28.6 years.
Search data
Specimen
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Common mussel species as invasive animal in rivers and lakes with high information level for water pollution
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Bioindicator in rivers and lakes
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Common brown alga of the coastal areas of the North and Baltic Sea
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One of the most important edible mussel species common in the North and Baltic Sea
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As the only viviparous fish in German nearshore waters, it is a bioindicator in nearshore coastal marine ecosystems.
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Inshore, the herring gull mainly feeds from the sea: upon fish, mussels, and crabs.
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A major primary producer in semi-natural and anthropogenic affected ecosystems.
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A major primary producer in semi-natural and anthropogenic affected ecosystems.
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A deciduous tree typical of ecosystems close to dense conurbations and an indicator for the characterisation of the immission situation during the vegetation period.
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As the most dominant deciduous tree species in Central Europe, it plays a significant role in most nearly natural and also anthropogenically influenced forest ecosystems up to an altitude of 1100 m.
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A pigeon species home in nearly every city.
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As an organism living at ground level, it is a major driver of the decomposition of organic material (e.g. plant litter).
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As an organism living at ground level, it is a major driver of the decomposition of organic material (e.g. plant litter).
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Student groups with an even number of female and male students at the age of 20 to 29.
Sampling area
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The only high mountains national park in Germany and an area of the Limestone Alps with international relevance
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Important, old-industrialised conurbation in Germany.
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Main water divide between the North- and Baltic Sea
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Longest river in Germany
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Germany's first national park
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National Park in the largest brackish water (Bodden) habitat of the world.
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National park in the world largest connected sand and mud flats.
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Fourth largest river basin in Central Europe
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Region in the chemical triangle of Central Germany
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Germany's largest forest national park
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4 university cities as sampling areas.
Sampling period
1985 - 2019