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Ultrasound assisted ion pair based surfactant-enhanced liquid–liquid microextraction with solidification of floating organic drop combined with flame atomic absorption spectrometry for preconcentration and determination of nickel and cobalt ions in vegetable and herb samples

Solvent ExtractionChemical EngineeringOrganic DropEngineeringEnvironmental Analytical ChemistrySurfactant-enhanced Liquid–liquid MicroextractionAnalytical ChemistryChemistryChromatographyHerb Samples