Re-examination of the microanalysis of non-ionic surfactants that contain polyoxyethylene chains by the method involving solvent extraction of the thiocyanatocobaltate(II) complex

Abstract

The microanalysis of surfactants of the type R-(O-CH,-CH,),OH by use of a colorimetric method involving solvent extraction of the thiocyanatocobaltate(I1) complex was re-examined for the pure compounds and for mixtures. It was concluded that Beer's law was not always obeyed, especially when the composition of the mixture was simple, and that the shape of the calibration graph was markedly dependent on the composition. The limits of the practical application of the method were considered.

The Environmental Chemistry, Fate and Effects of Nonionic Surfactants

“…The intensity of the DCM extract is measured at 620 nm (Boyer et al [36]). The CTAS procedure has been critically reviewed by Nozawa et al [37].…”

Simultaneous determination of polysorbate 20 and unbound polyethylene-glycol in protein solutions using new core–shell reversed phase column and condensation nucleation light scattering detection

“…Commonly used quantitative methods for polysorbates are quite time consuming (derivatization) and use hazardous solvents [6][7][8][9]. Tani et al applied a method using size exclusion chromatography to determine polysorbates [10].…”

A Simple and Rapid Method for the Detection of Non-Ionic Surfactants

“…Recently, a spectrophotometric approach, which is relatively inexpensive, has been proposed. This spectrophotometric method has been employed for the determination of non-ionic surfactants and is mostly based on extraction [6]- [9]. However, this method uses a series of complicated steps, and the solvents employed, such as 1,1,1-trichloroethane, chloroform, 1,2-dichlorobenzene, and benzene are often potentially harmful.…”

“…Various methods for the detection of non-ionic surfactants have been proposed [1]- [9] that are based on high-performance sophisticated analytical instruments [1]- [5]; simpler and less expensive analytical tools are, however, required. Recently, a spectrophotometric approach, which is relatively inexpensive, has been proposed.…”