engleski

Potentiometric determination of micromolar level of ethoxylated nonionic surfactants in effluents

Nonionic surfactants are surface-active compounds with hydrophobic and hydrophilic moieties. Commercial nonionic surfactants are normally a mixture of homologous structures composed of alkyl chains that differ in the number of carbons and hydrophilic moieties that differ in the number of ethylene oxide (ethoxylate, EO), propylene oxide (propoxylate, PO), and butylene oxide (butoxylate, BO) units. Almost all the analytical methods for determination of polyethoxylated nonionic surfactants are based on the formation of tetraphenylborate salts of pseudocationic complexes of nonionics surfactants with some metal cations (mainly barium). Barium ion forms pseudocationic complexes with ethoxylated nonionic surfactants (EONS.) Commercial NIO electrode was used for determination of end point in potentiometric titrations of nonionic surfactants in model solutions and effluents.

pseudocationic complexes; nonionic surfactant; effluents; sensor

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