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A low-cost microfluidic paper-based analytical device (µPAD) with column chromatography preconcentration for the determination of paraquat in vegetable samples

Food ChemistryEngineeringMedicineFood AnalysisBioanalysisColumn Chromatography PreconcentrationAgricultural EconomicsAnalytical ChemistryVegetable SamplesLiquid ChromatographyChromatographic AnalysisFood SafetyChromatography