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A Multiparameter Colloidal Titrations for the Determination of Cationic Polyelectrolytes

Journal of Environmental Protection 2012年第11期3卷 1559-1570页

作者： Eduardo A. López Maldonado Adrián o. Terán Mercedes T. o. Guzmán Centro de Graduados e Investigación del Instituto Tecnológico de Tijuana. Blvd. Industrial s/n Mesa de otay Tijuana México

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.

关键词： Polyelectrolyte Quantification Colloidal Titration Zeta Potential Polydadmac o-toluidine Blue Indicator Wastewater Treatment

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Evaluation of the Physicochemical Behavior of Waste Water Treatment Polyelectrolytes with Metal Ions

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Journal of Environmental Protection 2013年第3期4卷 270-279页

作者： Eduardo A. López Maldonado Mercedes T. oropeza Guzmán Georgina Pina-Luis Adrián ochoa-Terán Graduate and Research Center of the Technical Institute of Tijuana Tijuana México Graduate and Research Center of the Technical Institute of Tijuana Tijuana México Centre for Research and Technological Development in Electrochemistry Tijuana México

In this paper is describing the physicochemical behavior of polyelectrolytes (PEs) used in waste water treatment with mono-, di- and trivalent metal ions as K+, Mg2+, Zn2+, Fe3+, Sn2+, Cd2+, Pb2+, Cu2+, Ni2+, Al3+ and Cr3+. A coagulant polyelectrolyte Poly(vinyl sulfate) potassium salt (PVSK), and a commercial available Flocculant Trident 2756, were used as models for the study. The colloidal titration UV-Vis spectroscopy technique was successfully implemented in order to evaluate the complexation of PEs with toluidine Blue o (oTB) and the ability of different metal ions to displace the oTB from the PE-oTB complex and form the PE-metal ion complex. From the experiments was concluded that PVSK has a high affinity for Al3+ and Mg2+ while the Flocculant has the highest affinity for Sn2+ followed by Zn2+and Mg2+. The absorbance profiles of polyelectrolyte-oTB complex (Absorbance vs. Metal/PE) were used to calculate association constants. on the other hand, the mass balance of oTB and its absorbance profiles were used to calculate the association constants of polyelectrolyte-metal ion complexes. Thus metal ions with the highest affinities have the highest association constant. Metal ions with the highest affinities present the highest values of association constant.

关键词： Polyelectrolytes Metal Ions Colloidal Titration UV-Vis Spectroscopy o-toluidine WastewaterTreatment

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