Aluminium precipitates from groundwater of an aquifer affected by acid atmospheric deposition in the Senne, Northern Germany
✍ Scribed by Anke Lükewille; Nico Breemen
- Book ID
- 104781913
- Publisher
- Springer Netherlands
- Year
- 1992
- Tongue
- English
- Weight
- 323 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0049-6979
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✦ Synopsis
White precipitates collected from stream bottoms and well tubes in the Senne area consist of amorphous aluminium hydroxide, coprecipitated with minor amounts of sulfate, phosphate and silica. The precipitates have presumably formed by the interaction of slightly alkaline water from calcareous subsoil sediments, with acidic water draining off sandy soils affected by high inputs of acidic atmospheric deposition. From many hydrochemical studies, precipitation of aqueous aluminium is known to occur in subsurface horizons of acid soils affected by acid rain. On the basis of presumed equilibrium with soil solutions, jurbanite, A1OHSO4 9 5H20, is often assumed to be the secondary mineral involved. However, direct evidence for jurbanite from solid phase analysis is lacking. This first analysis of such a secondary phase does not support the jurbanite hypothesis, and shows that amorphous A1 hydroxide can be formed instead.