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Particulate aluminium in boreal streams: Towards a better understanding of its sources and influence on dissolved aluminium speciation
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2009 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 24, no 9, 1677-1685 p.Article in journal (Refereed) Published
Abstract [en]

The adverse impacts of the inorganic labile monomeric Al (Al-i) fraction on aquatic organisms have meant that Al (Al-tot) determination and even speciation has become a routine part of environmental monitoring and assessment. However, if samples are not filtered prior to analysis then particulate Al (Al-tot(p)) could influence the determination of Al-tot, and therefore the determination of the more toxicologically important (Al-i), both when it is measured analytically or modelled from Al-tot. This paper shows that the Al/DOC ratio in unfiltered samples can identify the Al-tot(p) fraction, and thus improve the speciation of Al-i. These findings are based on data from a study in a 67 km(2) catchment in northern Sweden during the snowmelt-driven spring flood of two consecutive years. Filtered and unfiltered samples were studied to determine the spatial and temporal patterns in Al-tot(p). The concentrations of Al-tot(p) were greatest in larger downstream sites where significant silt deposits are located. The sites with no silt in their drainage area showed a mean difference between filtered (Al-tot(f)) and unfiltered (Al-tot(uf)) samples of 6%, while sites with silt deposits had a mean difference of 65%. The difference between filtered and unfiltered samples was greatest at peak flow. Spikes in Al-tot(p) did not behave consistently during fractionation with a cation exchange column, resulting in increases in either measured Al-i(f) or non-labile monomeric Al (Al-o(f)). Al-tot(p) spikes were associated with sharp increases in the Al:DOC ratio. The baseflow Al:DOC ratio could be used to model filtered Al-tot from DOC with a Spearman rho of 0.75. 

Place, publisher, year, edition, pages
2009. Vol. 24, no 9, 1677-1685 p.
Keyword [en]
organic-carbon, northern sweden, spring flood, water samples, trace-metals, river, catchment, runoff, fractionation, variability
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-59689DOI: 10.1016/j.apgeochem.2009.04.038ISI: 000270644900007OAI: oai:DiVA.org:su-59689DiVA: diva2:430138
Note
authorCount :7Available from: 2011-07-07 Created: 2011-07-05 Last updated: 2017-12-11Bibliographically approved

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Mörth, Carl-Magnus
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