Computer Science
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..803d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 6, pp.803-808
Computer Science
4
Scientific paper
A critical review of activity coefficients and calculation procedures appropriate to the numerical definition of the solubility of ferrous sulfide is presented. Past difficulties encountered when comparing results from waters of different ionic strengths are discussed and a new operational solubility product, which overcomes some of these problems, is defined. The available data for known anoxic basins are re-calculated and presented in this revised form. Analysis of the data suggests that the residence time in the water body of the particulate ferrous sulfide phase may influence the solubility. In a deep basin, such as the Black Sea, there may be a long residence time which allows the particulate matter to age and become less soluble. Very shallow basins do not allow substantial ageing to occur. It is probable that the anoxic waters of Lake Nitinat and the Cariaco Trench are not saturated with respect to ferrous sulfide. The inadequacy of using filtration for distinguishing soluble and hence ferrous iron is highlighted and polarographic or well defined colorimetric procedures are recommended for future work so that results may be unambiguously interpreted.
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