A Potentiometric Study of Ferric Ion Complexes in Synthetic Media and Seawater

Authors

Robert H. Byrne, University of Rhode IslandFollow
Dana R. Kester, University of Rhode Island

Document Type

Article

Publication Date

1976

Digital Object Identifier (DOI)

https://doi.org/10.1016/0304-4203(76)90013-X

Abstract

An investigation of ferric ion complexing has been conducted in synthetic media and seawater at 25°C. Formation constants were potentiometrically determined for the species FeCl²⁺, FeCl₂⁺, FeOH²⁺, and Fe(OH)₂⁺ at an ionic strength of 0.68 m. Formation constants for the ferric chloride complexes were determined as _Clβ₁ = 2.76 and _Clβ₂ = 0.44. In a study of the reaction Fe³⁺ + nH₂O ⇌ Fe(OH)_n⁽³⁻ⁿ⁾⁺ + nH⁺ in NaClO₄, NaNO₃ and NaCl the formation constants ∗β1and∗β2">∗β1and∗β2 were shown to be relatively independent of medium when the effects of nitrate and chloride complexing were taken into account. The average values obtained for these constants are ∗β1= 1.93 · 10−3and∗β2= 8.6 · 10−8">∗β1= 1.93 · 10−3and∗β2= 8.6 · 10−8 . Reasonable agreement with these values was obtained when these constants were determined in seawater by accounting for the effects of chloride, fluoride and sulfate complexing.

Was this content written or created while at USF?

No

Citation / Publisher Attribution

Marine Chemistry, v. 4, issue 3, p. 275-287

Scholar Commons Citation

Byrne, Robert H. and Kester, Dana R., "A Potentiometric Study of Ferric Ion Complexes in Synthetic Media and Seawater" (1976). Marine Science Faculty Publications. 1656.
https://digitalcommons.usf.edu/msc_facpub/1656