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  • Study of degradation intermediates formed during electrochemical oxidation of pesticide residue 2,6-dichlorobenzamide (BAM) at boron doped diamond (BDD) and platinum-iridium anodes.

Study of degradation intermediates formed during electrochemical oxidation of pesticide residue 2,6-dichlorobenzamide (BAM) at boron doped diamond (BDD) and platinum-iridium anodes.

Chemosphere (2014-05-31)
Henrik Tækker Madsen, Erik Gydesen Søgaard, Jens Muff
摘要

Electrochemical oxidation is a promising technique for degradation of otherwise recalcitrant organic micropollutants in waters. In this study, the applicability of electrochemical oxidation was investigated concerning the degradation of the groundwater pollutant 2,6-dichlorobenzamide (BAM) through the electrochemical oxygen transfer process with two anode materials: Ti/Pt90-Ir10 and boron doped diamond (Si/BDD). Besides the efficiency of the degradation of the main pollutant, it is also of outmost importance to control the formation and fate of stable degradation intermediates. These were investigated quantitatively with HPLC-MS and TOC measurements and qualitatively with a combined HPLC-UV and HPLC-MS protocol. 2,6-Dichlorobenzamide was found to be degraded most efficiently by the BDD cell, which also resulted in significantly lower amounts of intermediates formed during the process. The anodic degradation pathway was found to occur via substitution of hydroxyl groups until ring cleavage leading to carboxylic acids. For the BDD cell, there was a parallel cathodic degradation pathway that occurred via dechlorination. The combination of TOC with the combined HPLC-UV/MS was found to be a powerful method for determining the amount and nature of degradation intermediates.

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Sigma-Aldrich
铱, powder, 99.9% trace metals basis
Sigma-Aldrich
金刚石, nanopowder, <10 nm particle size (TEM), ≥97% trace metals basis
Sigma-Aldrich
硼, crystalline, 1 cm, 99.7% trace metals basis
Sigma-Aldrich
金刚石, nanopowder, <10 nm particle size (TEM), ≥95% trace metals basis
Supelco
2,6-二氯苯甲酰胺, PESTANAL®, analytical standard
Sigma-Aldrich
金刚石, monocrystalline powder, ~1 μm
Sigma-Aldrich
铱, wire, diam. 0.15 mm, 99.9% trace metals basis
Sigma-Aldrich
金刚石, synthetic monocrystalline powder, ≤1 μm
铱, wire, straight, 100mm, diameter 0.5mm, as drawn, 99.9%
Sigma-Aldrich
铱, evaporation slug, diam. × L 0.6 cm × 1.2 cm, 99.9% trace metals basis
铱, foil, 25x25mm, thickness 0.25mm, as rolled, 99.9%
铱, wire reel, 0.1m, diameter 1.0mm, as drawn, 99.9%
铱, foil, 25x25mm, thickness 0.125mm, as rolled, 99.9%
铱, foil, 25x25mm, thickness 0.15mm, as rolled, 99.9%
铱, foil, 0.025m coil, thickness 0.05mm, coil width .5mm, as rolled, 99.9%
铱, foil, 0.05m coil, thickness 0.05mm, coil width .5mm, as rolled, 99.9%
硼, microfoil, disks, 10mm, thinness 0.1μm, specific density 23.5μg/cm2, permanent mylar 3.5μm support, 99.6%
硼, microfoil, disks, 25mm, thinness 0.1μm, specific density 23.5μg/cm2, permanent mylar 3.5μm support, 99.6%
硼, monofilament, 100m, diameter 0.1mm
硼, monofilament, 10m, diameter 0.1mm
硼, monofilament, 10m, diameter 0.2mm
硼, monofilament, 200m, diameter 0.1mm
硼, monofilament, 20m, diameter 0.1mm
硼, monofilament, 20m, diameter 0.2mm
硼, monofilament, 50m, diameter 0.1mm
铱, foil, 0.18m coil, thickness 0.05mm, coil width .5mm, as rolled, 99.9%
铱, foil, 0.1m coil, thickness 0.05mm, coil width .5mm, as rolled, 99.9%
铱, foil, light tested, 25x25mm, thickness 0.025mm, as rolled, 99.9%
铱, foil, light tested, 25x25mm, thickness 0.05mm, as rolled, 99.9%
铱, microfoil, disks, 10mm, thinness 0.1μm, specific density 224μg/cm2, permanent mylar 3.5μm support, 99.9%