ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 37, Number 9
JKCSEZ 37(9)
June 20, 1993 

In the presence of Mg2+, the interaction of nonionic surfactants, nonylphenol-(ethylene oxide)n[NP-nEO; n = 12, 40, 100] with iodine in aqueous solution were investigated by UV-visible spectrophotometer. CMC (critical micelle concentration) was decreased with increasing Mg2+ concentration, and those effects depend upon EO (ethylene oxide) numbers. Above CMC, the intensity of interaction peaks by the addition of Mg2+ increased and then decreased. The increase in the intensity of the interaction peaks were attributed to the compactness of micelle in the presence of Mg2+. These phenomena may be explained by the fact that the linear ethylene oxide chains, to be free configuration in aqueous solution, could form a psuedo-crown ether structures capable of forming complex with Mg2+.