A new spectrophotometric method for determination of residual polydiallyldimethylammonium chloride focculant in treated water based on a diazotization-coupledion pair

Isaac W. Mwangi, J. Catherine Ngila, Patrick Ndungu

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Polydiallyldimethylammonium chloride (polyDADMAC) is a water-soluble cationic polyelectrolyte used for water treatment. Its residues in treated water are contaminants as they react with chlorine to produce a carcinogenic compound. Commonly-used techniques for quantification of the polycation, such as colloidal and potentiometric titration as well as H NMR, have poor sensitivity and detection limits. This paper describes a more sensitive UV spectrophotometric method for quantitative determination of residual polyDADMAC in treated water, through formation of an ion pair with (4-hydroxy-1-napthylazo) benzene-sulphonic acid (dye). The ion pair, which is a colloidal solid material, was characterized by FTIR, 13C NMR and 1H NMR techniques. The colloid materials formed with different concentrations of polyDADMAC were dissolved in either N,N-dimethylformamide or 1,4-dioxane, followed by determination with UV spectrophotometry. The wavelength of maximum absorption (λmax) was found to be dependent on the solvent used, with 1,4-dioxane showing a better linear range of 0.1-1.8 mg· ℓ-1 polyDADMAC. Varying the pH of the solutions had no significant effect on λmax.

Original languageEnglish
Pages (from-to)707-714
Number of pages8
JournalWater S.A.
Volume38
Issue number5
DOIs
Publication statusPublished - Oct 2012

Keywords

  • (4-hydroxy-1-napthyl-azo) benzene-sulphonic acid
  • Focculant
  • Polydiallyldimethylammonium chloride
  • Treated water
  • UV spectrophotometry

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Water Science and Technology
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

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