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Highly selective electrochemical impedance spectroscopy-based graphene electrode for rapid detection of microplastics
Summary
A graphene electrode derived from petroleum waste was developed and applied as an electrochemical impedance spectroscopy sensor for highly selective detection of microplastics in aquatic samples. The approach offers a sensitive and selective alternative to optical methods for environmental microplastic monitoring.
The widespread occurrence of microplastics (MPs) in aquatic ecosystems that caused environmental pollution has attracted worldwide attention. Herein, graphene electrode was initially derived from petroleum waste. Then the electrochemical responses of the electrode were evaluated using electrochemical impedance spectroscopy (EIS) toward polystyrene (PS) under various optimum conditions. For the quantitative measurement of PS concentration, principal component analysis (PCA) score images displayed that the data points offered the best discrimination of the classes, and singular value decomposition (SVD) showed that a good linearity was achieved between Z"u(1) and lgC in the concentration range of 0.01-25 mg L. Especially for PS with particle size of 1 μm, the highest correlation coefficient (R = 0.9914) was obtained. The sensor ability to determine the polystyrene concentration in real samples was evaluated with the recovery of 98.4-113.3 % and reliable reproducibility (RSD < 9.72 %). For the quantitative measurement of the particle size of PS, SVD images exhibited that a linearity was obtained between Z'u(1)and lgD in the particle size range of 0.08-20 μm. A good linearity with R = 0.9877 was obtained when the concentration was 1 mg L. The recovery was in the range of 100.8-118.0 % with the RSD < 6.38 %. Therefore, a novel method is established for the rapid detection of PS MPs.