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A new method for the determination of the solubility of disperse dyes
Author(s) -
Braun Heinrich H
Publication year - 1991
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1991.tb01309.x
Subject(s) - solubility , solvent , chemistry , dissolution , titration , molar solubility , chromatography , thermodynamics , analytical chemistry (journal) , organic chemistry , physics
The solubility of sparingly soluble compounds, particularly when they are present in the finely dispersed state, is difficult to measure, especially at elevated temperature and pressure. To date there have been no simple methods of determination. A quick and very simple method is now presented, termed ‘solubility titration’, based on the idea that if the substance under test is added gradually in small amounts to a solvent or dilute solution, its extinction or light scattering in the u.v/visible region must change abruptly the moment the solubility is exceeded. Such is actually the case, and the solubility is found from the extinction or from the light scattered, at the point indicated by the intersection of two curves. This method was developed specifically to determine the water solubility of commercial disperse dyes under dyeing conditions, i.e. at 130d̀C and elevated pressure (about 400 kPa). Tests gave precise, highly reproducible values.

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