Water, Air, and Soil Pollution

, Volume 72, Issue 1–4, pp 213–233 | Cite as

Aluminium speciation: Variations caused by the choice of analytical method and by sample storage

  • Maria Berdén
  • Nicholas Clarke
  • Lars -Göran Danielsson
  • Anders Sparén
Article
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Accepted:

Abstract

We have compared a new FIA method (M1) for aluminium speciation in natural waters and a manual one based on one of Driscoll's proposals (M2). In synthetic solutions, aluminium's fluoro complexes were measured as ‘labile monomeric AP (Al i ) by M2, but not as ‘quickly reacting Al’ (Al qr ) by M1. Aluminium's complexes with Nordic Reference Humic Acid were measured neither as Al i nor as Al qr , and the same result was obtained for Al's citrato complexes. After excluding aluminium's fluoro complexes from Al i , the results of the two methods agreed well for soil leaching samples and fairly well for natural water samples. Detection limits: 10μg L−1 (ca. 0.4 μM) for both methods. Sample throughputs: M1∶66 injections h−1; M2∶5 samples h−1. Repeatabilities (RSD) on natural water samples: M1∶0.6–5.8% and M2 0.7–4.6%.

Sample storage studies on soil solutions (FIA method) indicated that storage effects were ‘sample type specific’. A sample with a low level of Al qr and a high DOC level (P2A) was more sensitive to storage than one with a high [Al] qr and a low [DOC] (P2B*). The decrease in [Al] qr was statistically significant after 10 h (P2A) and 24 h (P2B*), respectively. After 3 days' storage, [Al] qr had decreased by some 40% in P2A, while the decrease in P2B* was less than 10% after 8 days. The results of this part of the study also emphasize the importance of careful method standardization in sample storage studies.

Keywords

Leaching Humic Acid Soil Solution Fluoro Reference Humic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Maria Berdén
    • 1
  • Nicholas Clarke
    • 2
  • Lars -Göran Danielsson
    • 2
  • Anders Sparén
    • 2
  1. 1.Department of Ecology and Environmental ResearchSwedish University of Agricultural SciencesUppsalaSweden
  2. 2.Department of Analytical ChemistryThe Royal Institute of TechnologyStockholmSweden

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