Polarographic determination of benzotriazoles and their sorption behavior on granular activated carbon

  • A. N. AbabnehEmail author
  • M. A. Abu-Dalo
  • C. Horn
  • M. T. Hernandez
Original Paper


Because of their persistence and unknown environmental risks, the widespread occurrence of benzotriazoles has been gaining increased attention. A highly selective, rapid, and economical method—differential pulse polarography—was developed and applied for the quantitation of commercially significant methylbenzotriazole isomers in environmental samples of relevance to wastewater treatment, non-point source pollution and acid mine drainage. Differential pulse polarography was able to accurately measure aqueous methylbenzotriazole, as well as the methylbenzotriazole fraction that sorbed to activated sludge biomass, subsurface sediments, and activated carbon. Granular activated carbons were characterized for their ability to sequester benzotriazoles from aqueous environments using differential pulse polarography and high-performance liquid chromatography. Langmuir, Freundlich, Toth and Redlich–Peterson isotherm models were compared for their ability to describe benzotriazole partitioning to granular activated carbons under a relatively wide range of water quality conditions. Sorption behavior of 5-methylbenzotriazole was best-described by a Redlich–Peterson isotherm model, where water quality parameters were varied in the following range pH (1 < pH < 5), temperature (5 °C < T < 25 °C), and in the following ranges of an ionic strength (0.005 < M < 0.02). 4- and 5-methylbenzotriazole concentrations determined by differential pulse polarography correlated well with those concentrations measured by high-performance liquid chromatography through an environmentally significant range (0.4–30 mg/L). Using a static mercury drop electrode, the method detection limit was 50 and 40 μg/L for 4- and 5-methylbenzotriazole, respectively. The developed DPP polarographic method was found to be simple, rapid, and it can be applied directly to environmental samples without filtration, extraction, and centrifugation.


Benzotriazole Polarography Corrosion inhibitors Sorption 



This experimental work was supported in part by a career award to the fourth author from the United States National Science Foundation (NSF). The Award Number is 9702165.


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Copyright information

© Islamic Azad University (IAU) 2018

Authors and Affiliations

  • A. N. Ababneh
    • 1
    Email author
  • M. A. Abu-Dalo
    • 2
  • C. Horn
    • 3
  • M. T. Hernandez
    • 3
  1. 1.Department of Civil EngineeringJordan University of Science and TechnologyIrbidJordan
  2. 2.Chemistry DepartmentJordan University of Science and TechnologyIrbidJordan
  3. 3.Department of Civil, Environmental, and Architectural EngineeringUniversity of Colorado at BoulderBoulderUSA

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