Computer Science
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2255m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 10, pp.2255-2265
Computer Science
13
Scientific paper
A constant disequilibrium seeded-precipitation technique was used to determine the quantitative influence of orthophosphate ions on the growth kinetics and composition of magnesian calcite overgrowths, precipitated from artificial seawater ( S = 35 per mil), at 25°C over a wide range of saturation states in the presence of 0 to 500 M concentrations of Na 2 HPO 4 The amount of Mg incorporated in the magnesian calcite overgrowths is, as previously reported, independent of the precipitation rate and is not influenced by the presence of up to 60 M concentrations of Na 2 HPO 4 A reevaluation of previous data and results of this study confirm the rate dependence of the Sr distribution coefficient in calcite, D e Sr 2+ , observed by (1981). The influence of orthophosphate ions on the distribution coefficient of Sr in magnesian calcite overgrowths appears to be restricted to their influence on the precipitation rate. The precipitation rate data were fitted to an empirical kinetic expression R = k ( - 1) n where R = precipitation rate, k = rate constant, = saturation state, and n = reaction order. A regression analysis of the data indicates that the precipitation-inhibition effectiveness of orthophosphate is a function of the PO 4 3- concentration and increases as approaches unity. A linear log-log relationship between the rate constant and the PO -3 4 concentration suggests a strong interaction between the PO 4 3- and the energetically heterogeneous surface of the growing magnesian calcite.
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