Cost-Effective Flow Cell for the Determination of Malachite Green and Leucomalachite Green at a Boron-Doped Diamond Thin-Film Electrode
|
Accession number;06A0028774
|
| Title;Cost-Effective Flow Cell for the Determination of Malachite Green and Leucomalachite Green at a Boron-Doped Diamond Thin-Film Electrode |
| Author;
NGAMUKOT PASSAPOL
(Chulalongkorn Univ., Bangkok, Tha)
CHAROENRAKS THIRAPORN
(Chulalongkorn Univ., Bangkok, Tha)
CHAILAPAKUL ORAWON
(Chulalongkorn Univ., Bangkok, Tha)
MOTOMIZU SHOJI
(Okayama Univ., Okayama, Jpn)
CHUANUWATANAKUL SUCHADA
(Chulalongkorn Univ., Bangkok, Tha)
|
Journal Title;Anal Sci
|
Journal Code:G0673B
|
ISSN:0910-6340
|
|
VOL.22;NO.1;PAGE.111-116(2006)
|
| Figure&Table&Reference;FIG.8, TBL.1, REF.32 |
| Pub. Country;Japan |
| Language;English |
| Abstract;An electrooxidation and a cost-effective flow-based analysis of malachite green (MG) and leucomalachite green (LMG) were investigated at a boron-doped diamond thin-film (BDD) electrode. Cyclic voltammetry as a function of the pH of the supporting electrolyte solution was studied. Comparison experiments were performed with a glassy carbon electrode. A well-defined cyclic voltammogram, providing the highest peak current, was obtained when using phosphate buffer at pH 2. The potential sweep-rate dependence of MG and LMG oxidation (peak currents for 1 mM MG and LMG linearly proportional to v'1/2', within the range of 0.01 to 0.3 V/s) indicates that the oxidation current is a diffusion-controlled process on the BDD surface. In addition, hydrodynamic voltammetry and amperometric detection using the BDD electrode combined with a flow injection analysis system was also studied. A homemade flow cell was used, and the results were compared with a commercial flow cell. A detection potential of 0.85 V was selected when using a commercial flow cell, at which MG and LMG exhibited the highest signal-to-background ratios. For the homemade flow cell, a detection potential of 1.1 V was chosen because MG and LMG exhibited a steady response. The flow analysis results showed linear concentration ranges of 1-100 .MU.M and 4-80 .MU.M for MG and LMG, respectively. The detection limit for both compounds was 50 nM. (author abst.) |
|
|
|
Related Articles;
|
|
|
