Doctoral thesis
OA Policy
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.

Keywords
  • Arsenite
  • Antifouling
  • Freshwater
  • Gold nanoparticle
  • Microelectrode
  • Trace metals
  • Nanosphere
  • Buffer
  • Gold electrode
  • Hydrogel
  • Ion exchange
Research groups
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. Doctoral Thesis, 2015. doi: 10.13097/archive-ouverte/unige:81571
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Thesis
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Technical informations

Creation19/02/2016 11:58:00
First validation19/02/2016 11:58:00
Update time15/03/2023 00:12:02
Status update15/03/2023 00:12:02
Last indexation31/10/2024 02:57:08
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