Computer Science
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.5373a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 24, pp.5373-5378
Computer Science
2
Scientific paper
Vivianite Fe 3 (PO 4 ) 2 · 8H 2 O is an important phosphate mineral in many natural and environmental aquatic systems. Yet, the solubility product constant of vivianite has been determined only at room temperature. A new apparatus has been designed to facilitate the study of redox sensitive elements. Using this apparatus the solubility product constant of vivianite has been determined from 5 to 90°C. The equilibrium aqueous model MINTEQA2 used for data interpretation assumes the formation of all possible aqueous complexes. The temperature dependence of the negative logarithm of vivianite solubility (pKsp) product can be described between 5 to 90°C by pK sp = -234.205 + 12,242.6/ T + 92.510 log 10 T , where T is temperature in Kelvin, yielding log K sp = -35.767 ± 0.076 at 25°C. Using this expression, the calculated values of G °, H °, S °, and C ° p at 25°C and 0.969 atm total pressure are 204.1 kJ mol -1 , 5.05 kJ mol -1 , -667.8 J K -1 mol -1 , and -769 J K -1 mol -1 , respectively.
Al-Borno Amal
Tomson Mason B.
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