Characterization of an aluminium(III)-citrate species by means of ion chromatography with inductively coupled plasma-atomic emission spectrometry detection.
The aluminium(III)-citrate complex (NH(4))(4)[Al(2)(C(6)H(4)O(7))(C(6)H(5)O(7))(2)].4H(2)O was characterized using anion exchange chromatography on-line coupled with the element specific ICP-AES detector. Time-dependent monitoring of individual species in aqueous solution at different temperatures gave information about the species stability and the decomposition pathway. The aluminium-citrate complex (NH(4))(4)[Al(2)(C(6)H(4)O(7))(C(6)H(5)O(7))(2)].4H(2)O disintegrated via an unknown intermediary Al(III)-citrate species from which the thermodynamically stable complex [Al(3)(C(6)H(4)O(7))(3)(OH)(H(2)O)](4-) was formed. The activation energy for the decomposition reaction and the pre-exponential factor were determinated to be E(a)=81.95kJmol(-1) and A=3.62x10(13)s(-1).
Peukert
Alexander
A
Department of Chemistry, Analytical Chemistry, Philipps University of Marburg, Hans-Meerwein-Str., D-35032 Marburg, Germany.
Seubert
Andreas
A
D000535:Aluminum / Q000737:chemistry*; D002852:Chromatography, Ion Exchange / Q000379:methods*; D002951:Citrates / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods*
D002951:Citrates; D000535:Aluminum