Association of Nitrate Ion with Metal Cations in Aqueous Solution: a UV-Vis Spectrometric and Factor-Analytical StudyReport as inadecuate




Association of Nitrate Ion with Metal Cations in Aqueous Solution: a UV-Vis Spectrometric and Factor-Analytical Study - Download this document for free, or read online. Document in PDF available to download.

Croatica Chemica Acta, Vol.82 No.2 July 2009. -

Ion association in aqueous solutions of varied concentrations of LiNO3, NaNO3, CaNO32, SrNO32, BaNO32, MnNO32, CoNO32, NiNO32, CuNO32, ZnNO32, and CdNO32 was studied by means of UV spectrometry. In all cases, except for ZnNO32aq the principal-components PCA and evolving-factor EFA analyses of the spectra indicated formation of associated ion pairs MNO3z-1 Mz denotes the cation at higher salt concentrations. The dissimilarities of the MNO3z-1 Mz spectral profiles computed by EFA were examined by means of cluster analysis. The influence of transition-metal ions on the nitrate UV spectrum was found to be remarkably different compared to that of non-transition cations. That could be a consequence of different types of cation-anion interactions. The ion pairs containing non-transition metal ions could be regarded as classical electrostatic ones, whereas a weak coordination interaction was presumably present in the ion pairs formed by the nitrate and the cations of transition metals.

ion association; nitrate; UV spectrometry; principal components analysis; evolving factor analysis; cluster analysis



Author: Vlatka Gvozdić - ; Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Franje Kuhača 20, 31000 Osijek, Croat

Source: http://hrcak.srce.hr/



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