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Properties of humic substances from groundwater and surface waters
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
1992 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Humic substances play an important role in the environment. The aim of this thesis is to enhance the understanding of the behaviour of humic substances in natural waters and their importance for mobilizatiou/immobilization, redistribution, bioavailability and removal of metals and organic pollutants from aqueous systems.

An isolation technique suitable for isolation of humic substances fromgroundwater and surface water was developed and tested. The method utilizes adsorption to a weak anion exchange resin, DEAE-cellulose, which makes it possible to adsorb the humics without any pretreatment (e.g acidification) of the sampled water. The isolated humic substances were characterized by different methods (elemental analysis, gel filtration, potentiometric titration, UV absorbance, 14C-analysis) requiring only limited amounts of material, since generally only small quantities can be isolated from deep groundwater.

Humic substances from ground water and surface water differred with respect to e.g. elemental composition and molecular weight, although it was concluded that the humic substances have more similarities than differences.

Metal speciation, focussed on humic complexation, perfom1ed in field studies showed that the fraction of copper complexed with humic substances increased with increasing pH. Aluminium and iron were to a large extent bound to the humics at pH<6, while only a minor fraction of zinc and cadmium existed as humic complexes.

A survey of the concentration of organic matter in the Swedish and Finnishrivers running to the Gulf of Bothnia was performed. The inflow of humicsubstances and AOX (adsorbable organic halogens) to the Bothnian Bay is dominated by the discharge from the Finnish rivers, while the inflow to the Bothnian Sea is dominated by the Swedish rivers. The iron discharged from the Finnish rivers is largely associated with the humic substances; more than 30% of the copper transported to the Gulf of Bothnia appears to be bound to humic matter.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet , 1992. , 61 p.
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 79
National Category
Social Sciences Interdisciplinary
URN: urn:nbn:se:liu:diva-35364Local ID: 26410ISBN: 91-7870-899-0OAI: diva2:256212
Public defence
1992-05-22, Sal Elysion, Hus-T, Universitetsområdet Valla, Linköping, 22:00 (Swedish)
Papers, included in the Ph.D. thesis, are not registered and included in the posts from 1999 and backwards.Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2012-07-11Bibliographically approved

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