Gypsum-organic interactions in the marine environment: sorption of fatty acids and hydrocarbons

Details Gypsum-organic interactions in the marine environment: sorption of fatty acids and hydrocarbons Gypsum-organic interactions in the marine environment: sorption of fatty acids and hydrocarbons

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43...47b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 43, Issue 1, pp.47-53

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Scientific paper

Free fatty acids make up the bulk (50-84% wt/wt) of lipid materials recovered from artificial gypsum precipitates and crystals collected from sea salt evaporation pans. Both the fatty acids and hydrocarbons associated with artificial gypsum tend to be of longer mean chain length than organic materials dissolved in the mother liquor. Increased specific adsorption of n -fatty acids at Ca 2+ sites on gypsum surfaces is positively correlated with alkyl chain length. Neutral lipids were not significantly enriched in either type of gypsum precipitates. The fatty acids associated with gypsum from sea salt evaporation pans are branched fatty acids in contrast to the predominantly normal acids associated with artificial gypsum samples. Differences in the two adsorbed acid distributions are attributed to the unique lipids of hypersaline biota.

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