Direct detection of lead in RTIL using DPASV on BDD film microcells and determination of concentration factor after extraction from aqueous samples

[Departement_IRSTEA]Eaux [TR1_IRSTEA]BELCAInternational audienceEuropean Water Framework Directive and the Predicted Non Effect Concentrations for water organisms require determination of lead at very low concentrations: 1.2 mu g/L These low concentrations, generally in complex sample matrixes, have influence on the sensitivity and accuracy of the analytical method. Hence, prior to a determination, a clean-up and/or enrichment step is highly necessary. In this work, for the first time, the determination of Pb was performed using Differential Pulse Anodic Stripping Voltammetry (DPASV) on a Boron-Doped Diamond microcell directly in the room temperature ionic liquid (RTIL) extracting phase: Butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide which contained the complexing agent Trioctylphosphine oxide (TOPO). The calibration curves with and without TOPO are linear in the concentration range 0-4 mu g/L of Pb, with a detection limit (DL) of 0.3 mu g/L. The optimum conditions for higher concentration factor were determined: the aqueous phase should be a 0.1 M citrate buffer with pH 2. The obtained concentration factor was 5.0 +/- 0.2 for lead in RTIL without chelating agent TOPO, and 9.0 +/- 0.10 in IL with chelating agent TOP

Microcellules électrochimiques en diamant dopé au bore (BDD) obtenues par usinage laser pour la détection de différents métaux lourds : Cd(II), Ni(II), Pb(II), Hg(II), U(VI)

communication par afficheInternational audienc

New electrochemical BDD film microcells, micromachined with femtosecond laser - Application to the Determination of Water Framework Directive metals.

International audienc

Determination of different metals in wastewater using new microsensors based on diamond doped with boron (BDD)

International audienc

Determination of different metals in wastewater using new microsensors based on diamond doped with boron (BDD)

International audienc

New electrochemical BDD film microcells, micromachined with femtosecond laser - Application to the Determination of Water Framework Directive metals.

International audienc

Microcellules électrochimiques en diamant dopé au bore (BDD) obtenues par usinage laser pour la détection de différents métaux lourds : Cd(II), Ni(II), Pb(II), Hg(II), U(VI)

communication par afficheInternational audienc

Electrochemical Boron-Doped Diamond Film Microcells Micromachined with Femtosecond Laser: Application to the Determination of Water Framework Directive Metals

Planar electrochemical microcells were micromachined in a microcrystalline boron-doped diamond (BDD) thin layer using a femtosecond laser. The electrochemical performances of the new laser-machined BDD microcell were assessed by differential pulse anodic stripping voltammetry (DPASV) determinations, at the nanomolar level, of the four heavy metal ions of the European Water Framework Directive (WFD): Cd­(II), Ni­(II), Pb­(II), Hg­(II). The results are compared with those of previously published BDD electrodes. The calculated detection limits are 0.4, 6.8, 5.5, and 2.3 nM, and the linearities go up to 35, 97, 48, and 5 nM for, respectively, Cd­(II), Ni­(II) Pb­(II), and Hg­(II). The detection limits meet with the environmental quality standard of the WFD for three of the four metals. It was shown that the four heavy metals could be detected simultaneously in the concentration ratio usually measured in sewage or runoff waters