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The significance of oxygen as oxides and hydroxides in controlling the abundance and residence times of elements in seawater

Authors:	MD Kumar

Institution:	National Institute of Oceanography, Dona Paula, Goa 403 004 India

Abstract:	A model is presented which signifies the role of oxygen (as oxides and hydroxides) in controlling the composition of seawater. Using the regression equations $log K_{SW} =-0.77+0.03ΔO^{2-} M and M]_{SW} =K_{SW} M]_{crust}$ $log t =4.73+0.04ΔO^{2-} M$ respective concentration and residence times for the unknown elements can be estimated. Geometric and statistical indices of Legget and Williams (1981) are used to evaluate the accuracy of the model. This reveals from the known values of ΔO^2?M that the present model estimates log $t_{y}$ values within a factor of 1.77. The predicted oceanic residence times for Am, Ir, Ra and Rh are 3.6 × 10², 3.7 × 10², 2.2 × 10⁵ and 6.4 × 10² years, respectively.

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