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Doctoral thesis
Open access
English

Towards a renewable, reliable and robust electrochemical sensing principle for arsenic(III) detection in environmental freshwater systems

DirectorsBakker, Eric
Defense date2015-09-29
Abstract

The first aim of this work has been to develop an iridium-based microelectrode plated with a renewable gold nanoparticles coating. This system showed good reproducibility and reliability at the nanomolar concentration level for repeated gold film renewal and for the long term As(III) monitoring at a single film (7 d). In the second hand, the microelectrode covered by an inert antifouling membrane made of 1.5% LGL agarose was characterized for the analysis of As(III). The membrane demonstrated an ability to eliminate fouling by fulvic acid and inorganic colloid particles by size exclusion. Subsequently, this system was applied to the measurement of non-polluted freshwater samples from Lake Greifen (ZH, Switzerland). Finally, the concept of ion exchange nanospheres (IENS) as heterogeneous pH buffer incorporated in the antifouling membrane was put forward. Microelectrodes covered with an IENS-doped antifouling membrane demonstrated the ability to eliminate the pH interference for As(III) in the natural range of pH and are a promising direction for future in situ applications in environmental systems.

engfre
Keywords
  • Arsenite
  • Antifouling
  • Freshwater
  • Gold nanoparticle
  • Microelectrode
  • Trace metals
  • Nanosphere
  • Buffer
  • Gold electrode
  • Hydrogel
  • Ion exchange
Research group
Funding
  • European Commission - INTEGRATED IN SITU CHEMICAL MAPPING PROBES [614002]
  • Autre - CRSII2-147654-Sinergia project
Citation (ISO format)
TOUILLOUX, Romain Yannick Claude. Towards a renewable, reliable and robust electrochemical sensing principle for arsenic(III) detection in environmental freshwater systems. 2015. doi: 10.13097/archive-ouverte/unige:81571
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Creation02/19/2016 11:58:00 AM
First validation02/19/2016 11:58:00 AM
Update time03/15/2023 12:12:02 AM
Status update03/15/2023 12:12:02 AM
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