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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in atti di convegno anno 2016

Contributo in atti di convegno

Tipo: Poster


Anno di pubblicazione: 2016

Formato: Elettronico

Autori: R.Pilloton, J.Castagna, F.Malvano, D.Albanese

Affiliazioni autori: CNR-IIA, Univ. di Salerno (DIIN)

Autori CNR:


Lingua: inglese

Abstract: Recently, global traceability of mercury has been addressed with a network approach using automated and/or semi-automated systems for its sampling and detection in air and/or wet deposition based on commonly used analytical procedures for the determination of mercury in precipitation in global network. These latter require significant running costs for sampling and shipping samples to the reference laboratories, especially in remote regions such as Antarctica or in underdeveloped areas that do not have basic infrastructures. The sustainability of global scale monitoring networks for measuring mercury in air or precipitation samples depends on the development of advanced online (bio)sensors capable to quantify total mercury or even better speciated mercury concentrations. These advanced sensors should be robust, traceable and do not require gas carrier, significant energy supply and highly qualified technical expertise. Taking into consideration all the above, preliminary results on several sensors based on electrochemical impedance spectroscopy (EIS) for mercury speciation in air or wet deposition are reported: 1) Hg(I) and Hg(II) from wet deposition are electrochemically reduced to Hg(0) and deposed on a gold micro-electrode. 2) Similarly Hg(0) from air spontaneously reacts on gold electrode to create amalgam. 3) Hg(II) selectively reacts with oligonucleotides (12 bases) made of thymine. EIS, a powerful and sensitive technique, allows querying the electrode surface. 4) Hg(II) ions specifically interact with limonene based polymers. After EIS measurement Hg(0) can be easily removed from the gold surface by electrochemical oxidation and Hg(II) with imidazole. Minimal volumes (600 nanoL) and surfaces play a role in sensors performances. High sensitivity, L.o.d.= 0.06 ppq, L.o.q.=0.10 ppq and a sampling rate from 3 to 12 samples/h have been obtained.

Lingua abstract: inglese

Pagine totali: 1

Referee: Sė: Internazionale

Stato della pubblicazione: Preprint

Parole chiave:

  • mercury
  • biosesnors
  • Electrochemical Impedance Spectroscopy

Congresso nome: TRACESPEC 2016 GDA?SK, POLAND, 04-07.09.2016

Congresso luogo: Gdansk (Poland)

Congresso data: 4-7/9/2016

Congresso rilevanza: Internazionale

Congresso relazione: Contributo

Strutture CNR:

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