Spectroturbidimetric methods

Surfactant solubility determination Solubility limits of surfactants in brine solutions in the presence of alcohol cosurfactants were determined from visual observations of the surfactant solutions and by a spectroturbidimetric method similar to the one described by Frances et al. (2). The visual observation consisted of centrifuging surfactant solutions in a table-top centrifuge at room temperature and measuring the amount of the surfactant sediment at the bottom of the tube. Surfactant was not considered soluble in a given brine if any surfactant sediment was observed. 

The spectroturbidimetric method confirmed the results obtained from visual observations as the turbidity of solutions measured at 436 nm disappeared for solutions producing no surfactant sediment when centrifuged. 

In particular, the ensemble of a new phase during phase separation proceeding in a multi-component system belongs to such systems. In this case, the turbidity spectrum method provides the determination of the mass-volume new-phase particle concentration, as well as the degree of phase transition this can be used to construct the molecular-mass polymer distribution function (the method of spectroturbidimetric titration for polymer solutions—subsection 3.2.3) and for a phase analysis (identification) of the pheise separation type in polymer. systems (paragraph 3.6.2.5, sections 6.2 and 6.4). 

Spectroturbidimetric titration of polymer solutions as a method for analytical fractionation... 

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