Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 74, Issue 3, Pages 829-834Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2009.08.025
Keywords
Gallic acid; Ferrous sulfate; Complexation behavior
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Funding
- National Natural Science Foundation of China [20674068]
- Instrumental Analysis Foundation of Zhejiang Province, China [2007F70038]
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Kinetic study on the complexation of gallic acid with ferrous sulfate was performed using UV-Vis absorption spectroscopy. Under the experimental conditions, the stoichiometric composition of the formed complex is 1:1. The complexation reaction was found to be a second-order one. The influences of temperature, ionic strength and solvents oil the complexation reaction were investigated. According to the Arrhenius equation, the apparent activation energy of the complexation reaction was evaluated to be 71.64 kJ x mol(-1). A three-step reaction mechanism was proposed, which call well explain the kinetic results obtained. (C) 2009 Elsevier B.V. All rights reserved.
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