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has been cited by the following article:

• TITLE: A Multiparameter Colloidal Titrations for the Determination of Cationic Polyelectrolytes

  AUTHORS: Eduardo A. López Maldonado, Adrián O. Terán, Mercedes T. O. Guzmán

  KEYWORDS: Polyelectrolyte Quantification; Colloidal Titration; Zeta Potential, Polydadmac; O-Toluidine Blue Indicator; Wastewater Treatment

  JOURNAL NAME: Journal of Environmental Protection, Vol.3 No.11, November 29, 2012

  ABSTRACT: In water treatment processes and conditioning drinking water, PEs are widely used; however, their environmental impact is still doubtful, since residual concentrations increase organic matter content and represents a potential health hazard. This paper demonstrates a multiparametric study of two colloidal titration methods: spectrophotometric and zeta potential end point detection. The first one was optimized to guarantee the accuracy of cationic commercial PE quantification. It includes the indicator dose optimization using analytical criteria for competing equilibria, a calibration curve for two ranges of CPE concentration (1 - 5 ppm and 5 - 100 ppm) and the interference study of flocculant and Sn in the CPE quantification. The second method provides a physicochemical validation of the electric surface phenomena occurring during the colloidal titration and the end point detection. As an additional contribution the zeta potential titration was discussed and proposed as an alternative method for quantifying CPE when the sample is metal free.