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Size distribution of dissolved (<200 nm) organic carbon and aluminium in alkaline and humic lakes

Size distribution of dissolved (<200 nm) organic carbon and aluminium in alkaline and humic lakes Chemical equilibrium calculations treating humic substances as the simple diprotic phtalic acid, predicted no Al-humus at pH>6.5 in humic lake water. However, dissolved (<200 nm) organic carbon (DOC) and dissolved Al appeared to be linearly (r=0.597, P<0.001) correlated in samples from five different humic surface waters in The Netherlands with a DOC range of 10–36 mg.l−1 and a (mean) pH range of 6.85–8.47. Yet, organic carbon (Corg) and Al did no exhibit similar size distributions between 5 and 200 nm revealed by ultrafiltration. Averaged 25% of the Corg and >50% of the Al occurred in the fraction <5 nm. Only in this fraction the Corg and Al were linearly correlated (r=0.515, P<0.001). This result suggests the presence of organic ligands in the DOC pool of humic waters having smaller molecular sizes and higher Al stability constants than the humic substances used to model aquatic Al speciation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aquatic Ecology Springer Journals

Size distribution of dissolved (<200 nm) organic carbon and aluminium in alkaline and humic lakes

Haan, H.; Boer, T.; Voerman, J.
Aquatic Ecology , Volume 24 (2) – Nov 8, 2005
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References (22)

Publisher
Springer Journals
Copyright
Copyright
Subject
Life Sciences; Freshwater & Marine Ecology; Ecosystems
ISSN
1386-2588
eISSN
1573-5125
DOI
10.1007/BF02260432
Publisher site
See Article on Publisher Site

Abstract

Chemical equilibrium calculations treating humic substances as the simple diprotic phtalic acid, predicted no Al-humus at pH>6.5 in humic lake water. However, dissolved (<200 nm) organic carbon (DOC) and dissolved Al appeared to be linearly (r=0.597, P<0.001) correlated in samples from five different humic surface waters in The Netherlands with a DOC range of 10–36 mg.l−1 and a (mean) pH range of 6.85–8.47. Yet, organic carbon (Corg) and Al did no exhibit similar size distributions between 5 and 200 nm revealed by ultrafiltration. Averaged 25% of the Corg and >50% of the Al occurred in the fraction <5 nm. Only in this fraction the Corg and Al were linearly correlated (r=0.515, P<0.001). This result suggests the presence of organic ligands in the DOC pool of humic waters having smaller molecular sizes and higher Al stability constants than the humic substances used to model aquatic Al speciation.

Journal

Aquatic Ecology – Springer Journals

Published: Nov 8, 2005

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