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EC number: 231-843-4
CAS number: 7758-94-3
- autocatalysis of the oxidation of Fe(II) by ferric hydroxide
A review of the scientific literature reveals that the rates at which
dissolved Fe(II) oxidises to Fe(III) and the Fe(OH)3 precipitate (Skeaff
Based on empirical data reported in the literature, calculated
half-times for the oxidation Fe(II) under an atmosphere of air range
from 79 hr at pH 6, 20.5°C and an ionic strength of 0.034 to 8 seconds
at pH 8, 25 °C and an ionic strength of 0.009, which is close to that
for the OECD TG 203 toxicity testing medium. The autocatalysis of the
oxidation of Fe(II) by ferric hydroxide sets in at Fe(II) loadings
greater than ~50 μm (~3 mg/L) and increases the reaction rate to levels
greater than predicted by linear homogeneous reaction kinetics. Based on
literature data and empirical reaction kinetics, it was calculated that,
at pH 6 in the dilute 10x OECD TG 203 medium, the half-times are 11, 9
and 3.6 hr, respectively, for the oxidation of Fe(II) as 1, 10 and 100
mg/L loadings of FeSO4.
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