A non-adsorptive method for the isolation and fractionation of natural dissolved organic carbon

A non-adsorptive method for the isolation and fractionation of natural dissolved organic carbon

A non-adsorptive method was tested for the concentration and fractionation of dissolved organic carbon (DOC) in groundwater. Reverse osmosis combined with ultrafiltration recovered more than 90% of the DOC and efficiently separated the DOC into three size fractions. Unlike adsorptive methods, this p...

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Bibliographic Details
Published in:Water research (Oxford) Vol. 30; no. 5; pp. 1304 - 1311
Main Authors: Crum, R.H., Murphy, E.M., Keller, C.K.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 1996
Elsevier Science
Subjects:
dissolved organic carbon
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fractionation
Geochemistry
Groundwater
Hydrogeology
Hydrology. Hydrogeology
Ions
Mineralogy
Q1
reverse osmosis
Silicates
ultrafiltration
Water geochemistry
reverse osmosis
groundwater
ultrafiltration
dissolved organic carbon
ground water
chemical fractionation
organic acids
chemical analysis
sample preparation
humic acids
filtration
osmosis
instruments
separation
pH
dissolved materials
organic carbon
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Summary:A non-adsorptive method was tested for the concentration and fractionation of dissolved organic carbon (DOC) in groundwater. Reverse osmosis combined with ultrafiltration recovered more than 90% of the DOC and efficiently separated the DOC into three size fractions. Unlike adsorptive methods, this procedure avoids the use of strong acids and bases that may alter the structure of the DOC. A diafiltration method was applied during ultrafiltration that gave good separation of the DOC into high-, medium-, and low-molecular-size fractions. The high- and medium-molecular-size fractions are desalted during this fractionation procedure and can be further analyzed for individual compounds. The inorganic solutes remain in the low-molecular-size fraction. Future advances in ultrafiltration membrane technology may facilitate removal of inorganic ions without significant loss of low-molecular-size organic acids. Studies on a synthetic groundwater showed that the combined reverse osmosis/ultrafiltration method is viable for the concentration and fractionation of a wide range in organic compounds typically found in groundwater.
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ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(95)00279-0