Naslov
Microelectrodes for in situ voltammetric determination of pollutants

Autori
Paux, Thiery ; Billon, Gabriel ; Pižeta, Ivanka ; Ouddane, Baghdad ; Fischer, Jean-Claude ; Wartel, Michel

Izvornik
Journal de Physique. IV (1155-4339) 107 (2003), 2; 1413-1416

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, kongresno priopcenje, znanstveni

Ključne riječi
microelectrode; in situ; voltammetry

Sažetak
The toxicity of sediments is often closely bound to the labile toxic elements contents. In porewaters, metal concentrations are generally measured after separation from the solid matrix by means of pressure or centrifugation. The recent developments of in situ metal measurements by microsensors do not require any pretreatment of the sediment and hence avoid some possible artefacts like oxygen penetration in anoxic sediment and/or temperature modification. Our work describes firstly the preparation of microelectrodes based on a thin solid Silver (diameter: 30µ m) or Iridium (diameter: 75 µ m ) wire, covered at the tip with a fine layer of mercury. Secondly, an analytical procedure (based on cathodic voltammetry) is presented to measure Mn(II), Fe(II) and S(-II) concentrations, which play a relevant role in the metal pollutant cycle in sediments. By anodic stripping voltammetry, such microsensors are able to detect trace heavy metals such as Cd(II) or Pb(II) at relatively low concentration levels (~ 1 µ g.dm-3) with 5 minutes accumulation time. Finally, the most important challenge is to install the microelectrodes in natural media and to follow up metal pollution over a long time period.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

Napomena
Journal de Physique IV (Proceedings) ; XIIth International Conference on Heavy Metals in the Environment ; Grenoble, France, May 26-30, 2003 ; C. Boutron, C. Ferrari (Eds.) ; ISBN2-86883-683-6 (sv.1), 2-86883-684-4 (sv.2)

POVEZANOST RADA