Reis, CesarBruns, Roy E.Andrade, João Carlos deNakai, Debora2019-02-282019-02-281996-060169-7439https://doi.org/10.1016/0169-7439(96)00002-0http://www.locus.ufv.br/handle/123456789/23757Complexations of FeIII and CoII ions with thiocyanate in water-acetone-ethanol ternary mixtures are investigated using multivariate statistical techniques. Simplex lattice and hexagonal mixture designs lead to model equations resulting in similar conclusions. The FeII thiocyanate complex exhibits a very simple dependence (quadratic) on the ternary mixture composition. On the other hand this dependence is much more complex for the CoII thiocyanate complex since even a full cubic mixture model shows a significant lack of fit at the 95% confidence level. These results indicate that the different possible symmetries of the CoII complexes are more sensitive to the ternary mixture composition than are the multistep FeIII complex equilibria.pdfengElsevier B. V.Mixture designThiocyanate complexesStatistical modelingArtigo