Istituto di Geoscienze e Georisorse     
Chiodini G., Cioni R., Raco B., Scandiffio G. Carbonyl sulphide (COS) in geothermal fluids: an example from the Larderello field (Italy). In: Geothermics, vol. 20 (5/6) pp. 319 - 327. Elsevier, 1991.
The carbonyl sulphide (COS) content in the fluids of the 12 wells in the Larderello geothermal fields ranges from 0.005 to 0.1Ámol/mol. Measured data are comparable with the theorical concentrations, considering a homogeneous gas phase at the temperature and pressure conditions of the reservoir. However, the low temperature dependence of equilibrium constants of reactions involving COS prevents us from using them as geothermometers. On the contrary, PCO estimate in the gas equilibration zone can be inferred from the H2S/COS ratio. The calculated CO2 partial pressure are comparable with those estimated by means of the H2S/COS ratio
URL: http://https://www.journals.elsevier.com/geothermics
Subject Italy
Larderello geothermal field
geothermal fluid composition
carbonyl sulphide

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