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Phenolic compounds fining effect

The solvent often exerts a profound influence on the quality and shape of the spectrum. For example, many aromatic chromophores display vibrational fine structure in non-polar solvents, whereas in more polar solvents this fine structure is absent due to solute-solvent interaction effects. A classic case is phenol and related compounds which have different spectra in cyclohexane and in neutral aqueous solution. In aqueous solutions, the pH exerts a profound effect on ionisable chromophores due to the differing extent of conjugation in the ionised and the non-ionised chromophore. In phenolic compounds, for example, addition of alkali to two pH units above the pKa leads to the classical red or bathochromic shift to longer wavelength, a loss of any fine structure, and an increase in molar absorptivity (hyper chromic... [Pg.224]

Confirming previous studies, PVPP was the most effective fining agent in removing smaller phenolic compounds. However, in this study, bentonite and carbon were also... [Pg.152]

See other pages where Phenolic compounds fining effect is mentioned: [Pg.51]    [Pg.142]    [Pg.148]    [Pg.152]    [Pg.153]    [Pg.986]    [Pg.95]    [Pg.315]    [Pg.320]    [Pg.378]    [Pg.917]    [Pg.328]    [Pg.674]    [Pg.93]    [Pg.30]    [Pg.136]    [Pg.361]    [Pg.522]    [Pg.561]    [Pg.55]    [Pg.52]    [Pg.278]    [Pg.541]    [Pg.310]    [Pg.252]    [Pg.722]    [Pg.1165]    [Pg.267]    [Pg.10]    [Pg.113]   
See also in sourсe #XX -- [ Pg.315 ]



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