Determination of tetrakis(hydroxymethyl)phosphonium sulfate in commercial formulations and cooling water by capillary electrophoresis with contactless conductivity detection

A novel capillary electrophoresis method using capacitively coupled contactless conductivity detection is proposed for the determination of the biocide tetrakis(hydroxymethyl)phosphonium sulfate. The feasibility of the electrophoretic separation of this biocide was attributed to the formation of an...

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Bibliographic Details
Published in:Journal of separation science 2015-03, Vol.38 (5), p.852-857
Main Authors: Marques, Thaís Tamye, Shiroma, Letícia Sayuri, de Jesus, Dosil Pereira
Format: Article
Language:English
Subjects:
Biocides
Biofilms
Biofouling
Capillarity
Capillary electrophoresis
Chromatography
Conductivity
Cooling
Cooling water
Disinfectants - analysis
Electric Conductivity
Electrophoresis
Electrophoresis, Capillary - instrumentation
Electrophoresis, Capillary - methods
Formulations
Organophosphorus Compounds - analysis
Separation
Spectrum analysis
Sulfate-reducing bacteria
Sulfates
Tap water
Water Pollutants, Chemical - analysis
Water treatment
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Summary:A novel capillary electrophoresis method using capacitively coupled contactless conductivity detection is proposed for the determination of the biocide tetrakis(hydroxymethyl)phosphonium sulfate. The feasibility of the electrophoretic separation of this biocide was attributed to the formation of an anionic complex between the biocide and borate ions in the background electrolyte. Evidence of this complex formation was provided by 11B NMR spectroscopy. A linear relationship (R2 = 0.9990) between the peak area of the complex and the biocide concentration (50–900 μmol/L) was found. The limit of detection and limit of quantification were 15.0 and 50.1 μmol/L, respectively. The proposed method was applied to the determination of tetrakis(hydroxymethyl)phosphonium sulfate in commercial formulations, and the results were in good agreement with those obtained by the standard iodometric titration method. The method was also evaluated for the analysis of tap water and cooling water samples treated with the biocide. The results of the recovery tests at three concentration levels (300, 400, and 600 μmol/L) varied from 75 to 99%, with a relative standard deviation no higher than 9%.
ISSN:1615-9306
1615-9314
DOI:10.1002/jssc.201401288