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Aluminium fractionation using cation exchange: comparison of results obtained after fractionation in the field and in the laboratory

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Dissolved aluminium was fractionated in the field and the laboratory using a cation-exchange method. Although absolute differences between results obtained from field and laboratory fractionations were generally small, relative differences, expressed as the ratio between labile aluminium determined after laboratory fractionation (Al ll ) and that obtained after field fractionation (Al lf ) could be large. The differences found were not statistically significant, although this may simply reflect the spread in the results. Al ll /Al lf had no apparent relationship with the temperature difference between the field and the lab. Although some significant correlations were found between Al ll /Al lf and H + , no significant correlations were found with the equivalent relative difference in {H + } between the lab and the field; nor was any significant correlation found with dissolved organic carbon.
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Keywords: Aluminium; Cation exchange; Fractionation; Natural waters

Document Type: Research Article

Affiliations: 1: Norwegian Forest Research Institute, Høgskoleveien 8, N-1432 Ås, Norway 2: Yildiz Technical University, Istanbul, Turkey

Publication date: November 15, 2006

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