Nonionic surfactant-selective electrode and its application for determination in real solutions - Surfactants

Nonionic surfactant-selective electrode and its application for determination in real solutions
Received 19 May 2006; revised 8 August 2006; accepted 10 August 2006. Available online 18 August 2006.
Milan Sak-Bosnara, , , Dubravka Madunic-Cacicb, Ruzica Matesic-Puaca and Zorana Grabaricc
Analytica Chimica Acta
Volume 581, Issue 2 , 9 January 2007
ScienceDirect
Copyright ? 2006 Elsevier B.V. All rights reserved.
aDepartment of Chemistry, Josip Juraj Strossmayer University of Osijek, F. Kuhaca 20, HR-31000 Osijek, Croatia
bSaponia Chemical, Pharmaceutical and Foodstuff Industry, M. Gupca 2, HR-31000 Osijek, Croatia
cFaculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, HR-10000 Zagreb, Croatia
Abstract
A liquid membrane nonionic surfactant sensitive electrode has been prepared, based on a new barium pseudocationic complex of a highly ethoxylated fatty alcohol polyglycol ether and tetraphenylborate as sensing material. The complex has been incorporated into the plasticized PVC-membrane and used as sensing material.
The electrode exhibited positive linear non-Nernstian response toward different nonionic surfactants and sub-Nernstian response toward tetraphenylborate with the lower detection limit of 3.3 ? 10-7 mol dm-3 in barium chloride solution.
The interfering effect of some alkaline, alkaline earth, and heavy metal cations, has been demonstrated by displaying their calibration curves compared with that of Triton X-100.
The electrode has been used as an end-point indicator for potentiometric titration of analytical and technical grade polyethoxylated nonionic surfactants, modelled detergent products, and commercial detergents.
Keywords: Surfactant electrode; Poly(vinyl chloride) membrane; Polyethoxylated nonionic surfactant; Potentiometric titration; Detergent products
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