Abstract
This study discussed on the analytical method of nonionic surfactants by cobalt thiocyanate method coupled with ion exchange.
Cobalt thiocyanate method was improved in points of sensitivity and spctra in UV region by modifying salt and extractive solvent with KCl and 1, 2-dichloroethane. Nonionic surfactants of different ethyleneglycol content varied the sensitivity of this method, but generally used nonionic surfactants, which were composed of ethyleneglycol between several and some thirty, were similar in sensitivity.
Other surfactants such as anionic, cationic and amphoretic, and stearate as a sort of soap interfered this method positively. Chemical sizes, high molecular coagulants and protein interfered negatively, but amines, iron and abundant alcohol, positively.
Nonionic surfactants except amines were separated from anionic and cationic surfactants by double ion exchange column : Dowex AG 50W ×4 and Dowex AG 1 ×4, 8 cm height-2 cm dia. ; with 250 ml of (1+1) aqueous ethanol, 24 ml/min. The recovery, reproducibility and the result of standard addition method to the liquid-waste of dye works by overall procedure were very satisfactory. Applicated this procedure to the crude and treated liquid-waste of dye works, operation was facilitated with regard to emulsifying and colouring, and analytical data were 050% less than that without ion exchange.
1090 mg/l of nonionic surfactant was contained in the liquid-waste of dye works and 2 mg/l, in urban river water. The nonionic surfactants detected in these samples were several times more than anionic surfactants.
