Abstract

Precipitation experiments were carried out using chemo-stat technique in order to determine the effect of humic acid on the precipitation rate and composition of magnesian calcite from seawater under laboratory conditions (25°C, 1 atm). Results of our study clearly show that the presence of humic acid in seawater reduces the precipitation rate of magnesian calcite. However, MgCO3 composition in magnesian calcite overgrowths is not influenced by the presence of up to 9.2 mg C/l of humic acid.

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