Physics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1835n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 12, pp.1835-1841
Physics
10
Scientific paper
The redox potential of ZoBell's solution, consisting of 3.33 × 10 -3 molar K 4 Fe(CN) 6 , 3.33 × 10 -3 molar K 3 Fe(CN) 6 and 0.10 molar KCl, has been measured by a polished platinum electrode vs a saturated KCl, Ag/AgCl reference electrode. Measurements in the temperature range 8-85°C fit the equation E (volts) = 0.23145 - 1.5220 × 10 -3 ( t - 25) - 2.2449 × 10 -6 ( t - 25) 2 where t is in degrees Celsius. Evaluation of literature data was necessary to obtain a reliable value for the Ag/AgCl half-cell reference potential as a function of temperature. Combining the measurements from this study with the literature evaluation of the Ag/AgCl reference potential yields the temperature dependent potential for ZoBell's solution: E (volts) = 0.43028 - 2.5157 × 10 -3 ( t - 25) - 3.7979 × 10 -6 ( t - 25) 2 relative to the standard hydrogen potential. From these data the enthalpy, entropy, free energy and heat capacity for the ferro-ferricyanide redox couple have been calculated. The temperature equation for the potential of ZoBell's solution may be used for checking potentiometric equipment in the determination of the redox potential of natural waters.
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