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Effects of Gamma Irradiation on an Aquatic Fulvic Acid
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
1991 (English)In: Humic substances in the aquatic and terrestrial environment : proceedings of an international symposium, Linköping, Sweden, August 21-23, 1989 / [ed] B. Allard, H. Borén and A. Grimvall, Berlin Heidelberg New York: Springer, 1991, 233-241 p.Chapter in book (Refereed)
Abstract [en]

An aquatic fulvic acid was irradiated with gamma radiation from a 60Co-source (dose range 0-48 Mrad), as part of a larger study of the transformation and decomposition of humic substances in natura! aquatic systems. Experiments were performed at two concentrations (1000 mg/l and 100 mg/l) and at various pH-values (2-10). The fulvic acid transformation was studied by monitoring optical density (UV-spectroscopy ), molecular weight distribution (GPC-technique) and total dissolved organic carbon (TOC). A general decrease in TOC with increasing radiation dose was observed: the initial G-value of about 5 decreased with the increasing dose to a minimum value of 0.2-0.3. A simultaneous increase in molecular weight (Mn rose from approximately 2000 to a maximum of about 4000) was observed in the acidic samples (pH 2-4) at a dose below 10 Mrad. Natural background radiation can significantly contribute to the degradation of dissolved humic substances in deep groundwaters, considering the observed G-value for low doses (about 5) and the otherwise high chemical stability of the fulvic acid fraction even after long residence times (103-104 y) in the ground.

Place, publisher, year, edition, pages
Berlin Heidelberg New York: Springer, 1991. 233-241 p.
Series
Lecture Notes in Earth Science, ISSN 0930-0317 ; 33
Keyword [en]
Groundwater
National Category
Environmental Sciences related to Agriculture and Land-use Chemical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-112201ISBN: 3-540-53702-3 (print)OAI: oai:DiVA.org:liu-112201DiVA: diva2:764106
Available from: 2014-11-18 Created: 2014-11-18 Last updated: 2014-11-21Bibliographically approved

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Borén, Hans

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