| Autor: |
Suleimenov, O.M., Seward, T.M. |
| Zdroj: |
Geochimica et Cosmochimica Acta; December 1997, Vol. 61 Issue: 24 p5187-5198, 12p |
| Abstrakt: |
The ultraviolet spectra of dilute aqueous H 2S/HS −solutions have been measured up to 350°C. From these data, the molal equilibrium constant, K 1, for the first ionisation of H 2S has been calculated. Over the temperature range from 25 to 350°C at saturated vapour pressures, K 1varies from 6.99 (25°C) to 8.89 (350°C). Standard thermodynamic data for H 2S (aq) and HS −are presented for the temperature range 25 to 300°C at 100 bar. The shift of the charge-transfer-to-solvent spectrum of HS −with increasing temperature is attributable to an expansion of hydrosulphide ion solvation environment. |
| Databáze: |
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