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An all-solid-state potentiometric sensor for dichlorprop based on molecularly imprinted membranes and rGO-modified screen-printed electrodes
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DOI：10.1039/D6AY00553E.png)
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Abstract
En 中文
A highly selective all-solid-state potentiometric sensor was developed for the determination of the chlorophenoxy herbicide dichlorprop (2; 4-DP) by integrating a molecularly imprinted polymer (MIP) recognition element with a reduced graphene oxide (rGO) solid-contact transducer on a screen-printed carbon electrode (SPCE) platform. The MIP was synthesized via free-radical bulk polymerization using methacrylic acid as the functional monomer and ethylene glycol dimethacrylate as the crosslinker; generating selective binding sites complementary to dichlorprop. The incorporation of rGO significantly enhanced interfacial capacitance and minimized potential drift; resulting in improved signal stability and reproducibility. Under optimized conditions; the sensor exhibited a near-Nernstian response with a slope of −56 mV per decade over a linear concentration range of 7.0 × 10−6 to 1.0 × 10−3 M; and a detection limit in the order of 3.0 × 10−6 M. The proposed sensor demonstrated excellent selectivity toward dichlorprop over structurally related phenoxy herbicides (2; 4-D; MCPA; and mecoprop) and common inorganic anions; attributed to the high specificity of the imprinted binding sites. Chronopotentiometric measurements confirmed a significant reduction in potential drift and a substantial increase in interfacial capacitance for the rGO-modified electrode compared to the unmodified counterpart. The sensor exhibited rapid response (≤10 s); high repeatability (RSD < 3%); and good operational stability. Its practical applicability was validated through the analysis of spiked environmental water samples and commercial herbicide formulations; yielding recoveries in the range of 95–105%; in excellent agreement with high-performance liquid chromatography (HPLC) results. This work presents a robust; miniaturized; and cost-effective sensing platform for rapid on-site monitoring of dichlorprop; highlighting the synergistic integration of molecular imprinting and nanostructured solid-contact transducers for advanced environmental analysis.
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