Chromium

formula: Cr; CAS Registry Number: 7440-47-3

Naturally occurring transition metal

Chromium is a ubiquitous chemical element, which mostly occurs as chromite ore (FeCr2O4) in nature. In metal working industries chromium is used in alloys and as surface coatings against corrosion. Other applications include catalysts, pigments, oxidants, tanning, and wood preservation. It enters the environment mainly through anthropogenic activities. Natural emission sources include volcanic action, weathering and biological processes. Chromium is found in the atmosphere, in soils, waters, plants and animals. It is essential for humans. Some chromium compounds, however, are

Specimen

Suspended particulate matter Fine insoluble mineral or organic particles in the water phase
Common bladder wrack Common brown alga of the coastal areas of the North and Baltic Sea
Common spruce A major primary producer in semi-natural and anthropogenic affected ecosystems.
Pine A major primary producer in semi-natural and anthropogenic affected ecosystems.
Lombardy poplar A deciduous tree typical of ecosystems close to dense conurbations and an indicator for the characterisation of the immission situation during the vegetation period.
Beech 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.
Soil Soil is livelihood and biosphere for humans, animals, plants and soil organisms. All the substances brought in are transported, transformed and/or accumulated in the soil.

Sampling area

BR/NP Berchtesgaden The only high mountains national park in Germany and an area of the Limestone Alps with international relevance
Saarländischer Verdichtungsraum Important, old-industrialised conurbation in Germany.
Bornhöveder Seengebiet Main water divide between the North- and Baltic Sea
Rhein Longest river in Germany
NP Bayerischer Wald Germany's first national park
NP Vorpommersche Boddenlandschaft National Park in the largest brackish water (Bodden) habitat of the world.
BR/NP Wattenmeere National park in the world largest connected sand and mud flats.
Elbe Fourth largest river basin in Central Europe
Verdichtungsraum Halle-Leipzig Region in the chemical triangle of Central Germany
NP Harz Germany's largest forest national park
Solling Second highest and largest low mountain range in Northern Germany
BR Pfälzerwald Germany's largest connected forest area in a range of low mountains
Oberbayerisches Tertiärhügelland The Upper Bavarian Tertiary Uplands are a part of the Southern German Molasse Basin
Donau Second largest river in Europe

Sampling period

1985 - 2019