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Catchment-scale microbial sulfate reduction (MSR) of acid mine drainage (AMD) revealed by sulfur isotopes

Fischer, Sandra (author)
Stockholms universitet,Institutionen för naturgeografi
Jarsjö, Jerker (author)
Stockholms universitet,Institutionen för naturgeografi
Rosqvist, Gunhild (author)
Stockholms universitet,Institutionen för naturgeografi
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Mörth, Carl-Magnus (author)
Stockholms universitet,Institutionen för geologiska vetenskaper
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 (creator_code:org_t)
Elsevier BV, 2022
2022
English.
In: Environmental Pollution. - : Elsevier BV. - 0269-7491 .- 1873-6424. ; 292, Part B
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Laboratory experiments and point observations, for instance in wetlands, have shown evidence that microbial sulfate reduction (MSR) can lower sulfate and toxic metal concentrations in acid mine drainage (AMD). We here hypothesize that MSR can impact the fate of AMD in entire catchments. To test this, we developed a sulfur isotope fractionation and mass-balance method, and applied it at multiple locations in the catchment of an abandoned copper mine (Nautanen, northern Sweden). Results showed that MSR caused considerable, catchment-scale immobilization of sulfur corresponding to a retention of 27 ± 15% under unfrozen conditions in the summer season, with local values ranging between 13 ± 10% and 53 ± 18%. Present evidence of extensive MSR in Nautanen, together with previous evidence of local MSR occurring under many different conditions, suggest that field-scale MSR is most likely important also at other AMD sites, where retention of AMD may be enhanced through nature-based solutions. More generally, the developed isotope fractionation analysis scheme provides a relatively simple tool for quantification of spatio-temporal trends in MSR, answering to the emerging need of pollution control from cumulative anthropogenic pressures in the landscape, where strategies taking advantage of MSR can provide viable options.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

Keyword

Bacterial sulfate reduction (BSR)
Metal retention
Nature-based solution
Mine waste
End-member mixing model
Rayleigh equation

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Fischer, Sandra
Jarsjö, Jerker
Rosqvist, Gunhil ...
Mörth, Carl-Magn ...
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NATURAL SCIENCES
NATURAL SCIENCES
and Earth and Relate ...
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Stockholm University

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