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Ion pair-based dispersive liquid–liquid microextraction for gold determination at ppb level in solid samples after ultrasound-assisted extraction and in waters by electrothermal-atomic absorption spectrometry

Solvent ExtractionChemical EngineeringGold DeterminationEngineeringAnalytical InstrumentationNatural SciencesSpectroscopyAnalytical ChemistryUltrasound-assisted ExtractionChemistryPpb Level