Ma. Ivanova et al., A NEW REFRACTION METHOD FOR DETERMINING THE DEGREE OF ETHOXYLATION OFNONIONIC SURFACTANTS, Journal of dispersion science and technology, 16(6), 1995, pp. 495-510
We have proposed two refractometic methods for determination of the de
gree of ethoxylation, n, of non-ionic surfactants. The first method al
lows calculation of n from the measured values of the refractive index
and the density of the sample. In the second method n is found from a
calibration curve and the measured refractive index.