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Journal of Powder Technology
Volume 2013 (2013), Article ID 164239, 7 pages
Research Article

The Solubility of Two Magnetite Powders in Oxalic Acid: Applicability of Empirical Modelling

Department of Chemistry, Lappeenranta University of Technology, Skinnarilankatu 34, 53850 Lappeenranta, Finland

Received 26 September 2012; Revised 5 December 2012; Accepted 10 December 2012

Academic Editor: Tomasz Sosnowski

Copyright © 2013 Riina Salmimies et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Phenomena-based models can be used in a predictive manner, but statistical modelling methods can also yield interesting findings and can serve as a tool for analysing the effects of different variables on the overall phenomenon. In addition, the generation of theoretical models can sometimes be limited due to the unideality of the studied system. Statistical modelling, in this case multiple-linear regression (MLR), was used to describe the effects of temperature and acid concentration on the dissolution of magnetite, Fe3O4 with oxalic acid. Whereas a linear model with an interaction term was sufficient in describing the dissolution of synthetic Fe3O4, a more complex full quadratic model had to be used to describe the dissolution of industrial Fe3O4 in the same conditions.