Abstract
<p> 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 FeCl <sup> 2+ </sup> , FeCl <sub> 2 </sub> <sup> + </sup> , FeOH <sup> 2+ </sup> , and Fe(OH) <sub> 2 </sub> <sup> + </sup> at an ionic strength of 0.68 <em> m </em> . Formation constants for the ferric chloride complexes were determined as <sub> <em> Cl </em> </sub> <em> β </em> <sub> 1 </sub> = 2.76 and <sub> <em> Cl </em> </sub> <em> β </em> <sub> 2 </sub> = 0.44. In a study of the reaction Fe <sup> 3+ </sup> + <em> n </em> H <sub> 2 </sub> O ⇌ Fe(OH) <sub> n </sub> <sup> (3−n)+ </sup> + nH <sup> + </sup> in NaClO <sub> 4 </sub> , NaNO <sub> 3 </sub> 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.</p>
Original language | American English |
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Journal | Marine Chemistry |
Volume | 4 |
DOIs | |
State | Published - Jan 1 1976 |
Externally published | Yes |
Disciplines
- Life Sciences