Enhanced Arsenic Contents in Spring Water within the Engadine Valley (South-eastern Switzerland; Canton of Graubünden)
Journal Title: Archives of Organic and Inorganic Chemical Sciences - Year 2018, Vol 2, Issue 4
Abstract
Enhanced arsenic contents were observed (at the Chemical laboratory of the Canton Graubunden in Chur) in the water of some mountainous springs of the Upper Engadine Valley in the vicinity the alpine resort of St. Moritz. In the investigated springs situated within the zone of crystalline rocks belonging mainly to the Bernina crystalline unit concentrations of up to 120 micrograms per litre were measured. In this area the outcropping crystalline units are overlapped by mesozoic sediments, mostly sandstone, dolomite, limestone and nair-porphyroide. The Building Authorities of St. Moritz asked.com to find the source of these arsenic contents. The water of the affected springs is no longer used as drinking water and they have cut it off from the main water supply.Near the city of St. Moritz (Figure 1, Canton of Graubunden, Switzerland) were measured enhanced arsenic concentrations in the spring water which is used for drinking water. The investigated area is mainly formed of silicate rocks, which regionally contain arsenic-bearing minerals such as pyrite and haematite. The soil percolation water is contaminated with arsenic up to 120 micrograms per litre. These observed concentrations are largely above the internationally recommended limiting value of 10|ig/l. The sources of arsenic are supposed to be related to the occurrence of pyrite iron ore minerals and arsenic sulphur-minerals, such as arseno-pyrite (FeAsS) and CoAsS, within the crystalline rocks
Authors and Affiliations
Julia Rafflenbeul, Werner Balderer
Keywords
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- EP ID EP603066
- DOI 10.32474/AOICS.2018.02.000142
- Views 64
- Downloads 0
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