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  • Volume 15, Issue 2

Application of laser-induced breakdown-detection as a sensitive detector for UF membrane surrogate challenge tests

M. Tröster, P. Lipp, F. Sacher, T. Hofmann, H.-J. Brauch
Published April 2015, 15 (2) 377-383; DOI: 10.2166/ws.2014.126
M. Tröster
DVGW-Technologiezentrum Wasser, Karlsruher Str. 84, Karlsruhe 76139, Germany E-mail: martin.troester@tzw.deDepartment of Environmental Geosciences, University of Vienna, Althanstr. 14, Vienna 1090, Austria
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P. Lipp
DVGW-Technologiezentrum Wasser, Karlsruher Str. 84, Karlsruhe 76139, Germany E-mail: martin.troester@tzw.de
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F. Sacher
DVGW-Technologiezentrum Wasser, Karlsruher Str. 84, Karlsruhe 76139, Germany E-mail: martin.troester@tzw.de
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T. Hofmann
Department of Environmental Geosciences, University of Vienna, Althanstr. 14, Vienna 1090, AustriaResearch Cluster Environmental Sciences, University of Vienna, Vienna 1010, Austria
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H.-J. Brauch
DVGW-Technologiezentrum Wasser, Karlsruher Str. 84, Karlsruhe 76139, Germany E-mail: martin.troester@tzw.de
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Abstract

Characteristics of ultrafiltration membranes with respect to the removal of nanoscale particles can be determined by surrogate challenge tests (SCTs). Key elements of a successful SCT are the selection of a suitable surrogate and a reliable quantification method. A major challenge when using nanoparticles as surrogates is their quantification in the filtrate, since commonly used particle detection methods are often lacking in sensitivity. The applicability of laser-induced breakdown-detection (LIBD) as a monitoring tool for SCTs has therefore been evaluated. The SCTs were carried out using polystyrene (PS) and silicate particles spiked into ultrapure water and into bank filtrate. Nanoparticles were detectable down to 10 nm and, depending on the material, down to a few ng/L. The nominal pore-size of the ultrafiltration membrane could be confirmed during the tests, demonstrating the suitability of LIBD as a highly sensitive monitoring technique for SCTs.

  • laser-induced breakdown-detection
  • nanoparticles
  • surrogate challenge tests
  • ultrafiltration
  • First received 11 August 2014.
  • Accepted in revised form 18 November 2014.
  • © IWA Publishing 2015
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Water Science and Technology: Water Supply: 18 (2)
  Volume 15, Issue 2

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Application of laser-induced breakdown-detection as a sensitive detector for UF membrane surrogate challenge tests
M. Tröster, P. Lipp, F. Sacher, T. Hofmann, H.-J. Brauch
Water Science and Technology: Water Supply Apr 2015, 15 (2) 377-383; DOI: 10.2166/ws.2014.126
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Application of laser-induced breakdown-detection as a sensitive detector for UF membrane surrogate challenge tests
M. Tröster, P. Lipp, F. Sacher, T. Hofmann, H.-J. Brauch
Water Science and Technology: Water Supply Apr 2015, 15 (2) 377-383; DOI: 10.2166/ws.2014.126

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Keywords

laser-induced breakdown-detection
nanoparticles
surrogate challenge tests
ultrafiltration
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