Gypsum-organic interactions in natural seawater: Effect of organics on precipitation kinetics and crystal morphology |
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| Authors: | MJ Barcelona DK Atwood |
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| Institution: | Department of Marine Sciences, University of Puerto Rico, Mayaguez Puerto Rico |
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| Abstract: | Organic compounds which are chloroform extractible from seawater affect gypsum precipitation by inhibiting the nucleation of crystals. The effect is selective towards calcium-populated crystal habit faces and results in the growth of more tabular, equidimensional crystals. Studies using model organic compounds suggest that the inhibition takes place through an adsorption mechanism and show that longer-chained n-fatty acids are more actively adsorbed. The specific adsorption mechanism (at Ca2+ habit faces) is also supported by the fact that the free-acid (base-soluble) fraction of the chloroform extractibles from seawater is more active than the neutral fraction. The calcium ion complexing ability of model organic compounds is not correlatable with their inhibitory effects on gypsum crystal nucleation. |
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