Toxicity of Inorganic Aluminium in Humic Streams

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Andrén, Cecilia M.,1964-Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM) (author)

Toxicity of Inorganic Aluminium in Humic Streams

BookEnglish2012

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Stockholm :Department of Applied Environmental Science (ITM), Stockholm University,2012
42 s.
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:su-80651
ISBN:9789174475777
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-80651URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:vet swepub-contenttype
Subject category:dok swepub-publicationtype

Notes

Aluminium (Al) has been recognised as a main toxic factor alongside pH in acidified water ecosystems. The toxic effect of Al has been attributed to inorganic Al (Ali), though there are few in situ studies in ambient humic waters which are the focus of this thesis.The aim was to estimate Ali toxicity and thus also Ali concentrations in Swedish humic streams. Subsequently it is necessary to analyse Ali correctly, which was studied by modelling and method intercalibrations. The hypothesis was that the effect of Ali could be followed via physiological effects and Al accumulation, as well as by mortality. Toxicity was studied by in stream exposures of brown trout (Salmo trutta L.) and two salmonid prey organisms (Gammarus pulex and Baetis rhodani) during spring flood.The modelling of the Ali fraction was performed using monitoring data covering all of Sweden with satisfactory results. The essential variables for Ali modelling were determined; Al, DOC, pH and F, while Fe, Ca and Mg had less effect. The automated analytical procedure for Ali (with cation exchange followed by complexation with pyrocatechol violet) was modified and validated and showed to be the preferred method for laboratory analyses.To avoid detrimental effects for brown trout Ali should be <20 µg/L and pH >5.0; mortality was high when the Ali was above 50 µg/L. The invertebrates were more sensitive, as mortalities occurred at pH <6.0 and Ali >15 µg/L for G. pulex, and at pH <5.7 and Ali >20 µg/L for B. rhodani. It is prudent to use a wide view and let the most sensitive species set the tolerance limits; a pH above 5.7-6.0 and Ali below 15-20 µg/L allows the stream ecosystems to thrive.Today, as waters are recovering from acidification, the aim of mitigating liming is to carefully adjust dosage to avoid suboptimal water quality. The thresholds found in this thesis can be used to efficiently but carefully decrease liming, as both Ali and pH levels have to be balanced to sustain the recovering aquatic biota.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
Inorganic Al
toxicity
acidification
humic streams
Applied Environmental Science
tillämpad miljövetenskap

Added entries (persons, corporate bodies, meetings, titles ...)

Rydin, Emil,Associate ProfessorUppsala universitet, EBC, Department of Limnology (thesis advisor)
Borg, Hans,ProfessorStockholms universitet,Institutionen för tillämpad miljövetenskap (ITM) (thesis advisor)
Eriksson Wiklund, Ann-Kristin,Ph.D.Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM) (thesis advisor)
Rosseland, Björn-Olav,ProfessorDepartment of Ecology and Natural Resource Management & Department of Plant- and Environmental Sciences, Norwegian University of Life Sciences, Norge (opponent)
Stockholms universitetInstitutionen för tillämpad miljövetenskap (ITM) (creator_code:org_t)

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