Tyck till om SwePub Sök
här!
Sökning: id:"swepub:oai:DiVA.org:oru-13919" >
Origin and distribu...
Origin and distribution of low molecular weight organic acids and bacteria in a depth profile of a soil covered tailings impoundment in northern Sweden
-
- Ebena, Gustav (författare)
- Linköpings universitet,Biologi,Tekniska högskolan
-
- Hagberg, Jessika (författare)
- Örebro universitet,Institutionen för naturvetenskap,MTM, Department of Natural Sciences, Örebro University, 701 82 Örebro, Sweden
-
- Carlsson, Erik (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik,Div. Applied geology, Department of Environmental Engineering, Luleå University of Technology, 971 87 Luleå, Sweden
-
(creator_code:org_t)
- Elsevier BV, 2007
- 2007
- Engelska.
-
Ingår i: Journal of Geochemical Exploration. - : Elsevier BV. - 0375-6742 .- 1879-1689. ; 92:2-3, s. 186-195
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
https://urn.kb.se/re...
-
visa färre...
Abstract
Ämnesord
Stäng
- The tailings at Kristineberg, northern Sweden, have a very low content of organic carbon, a feature common with many sulfidic tailing impoundments. Three different experiments were set-up to assess the role of carbon dioxide in a depth profile. Firstly, pore gas was collected in vials from ground water pipes at various points in the profile of a dry covered tailings impoundment and analyzed in the laboratory for CO2, O-2, N-2, H-2, and CH4 contents. Secondly, pore water was extracted from tension lysimeters at various depths. This water was analyzed for numbers of bacteria (iron-oxidizing and sulfur-oxidizing, both by MPN), and low molecular weight organic acids. Thirdly, Acidithiobacillus ferrooxidans (Strain DSMZ No 1927) was grown on a mixture of irradiated tailings and sterile water. The amount of organic acids produced was monitored. The largest bacterial count of iron-oxidizing bacteria, 4.7 x 10(5)/g tailings, was at the oxidation front, while the heterotrophic sulfur-oxidizing bacteria were mainly found in the unsaturated, oxidized zone, 2.65 x 10(4)/g tailings. The oxidation front was also the location where the largest amount of organic acids was found in the field study (formate 0.83 mg/l and acetate 0.51 mg/l). The acetic acid found coincides with the highest count of iron-oxidizing bacteria. The intrusion of O-2 and CO2 at the studied location is enough for microbiological activity, although the overall effect on AMD production is not addressed. The results from laboratory incubations indicate that the microbial community produces organic carbon with CO2 as the sole carbon source, up to 1.35 mg/l after 16 weeks measured as TOC. To conclude, we suggest that knowledge of the intrusion of both CO2 and O-2 is vital for a full understanding of the microbial ecology, and thus the weathering processes, in a dry covered tailings impoundment. Hence, the CO, produced in the till cover and entering the tailings ecosystem is crucial to the function of the ecosystem. (c) 2006 Elsevier B.V. All rights reserved.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Nyckelord
- carbon cycling
- microbial ecology
- soil cover
- mine tailings
- autotrophy
- Chemistry
- Kemi
- Chemistry
- Kemi
- Applied Geology
- TECHNOLOGY
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas