Abstract
A sensitive electrochemical stripping voltammetric method for analyzing organophosphate (OP) compounds was developed based on solid-phase extraction (SPE) at zirconia (ZrO 2) nanoparticles modified electrode. ZrO 2 nanoparticles were proved as a new sorbent for SPE of OP pesticides. Because of the strong affinity of ZrO 2 for the phosphoric group, nitroaromatic OPs can strongly bind to the ZrO 2 nanoparticle surface. The combination of SPE with square-wave voltammetry (SWV) provided a fast, sensitive, and selective electrochemical method for nitroaromatic OP compounds using methyl parathion (MP) as a model. The stripping response was highly linear over the MP range of 0.003–2.0 μg/mL, with a detection limit of 0.001 μg/mL. The fast extraction ability of ZrO 2 nanoparticles makes it promising sorbent for various solid-phase extractions.
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