Mercury species determination by task specific ionic liquid-based ultrasound-assisted dispersive liquid-liquid microextraction combined with cold vapour generation atomic absorption spectrometry

► The preconcentration of mercury species with TSIL USA DLLME is optimized. ► The determination by CV AAS in organic phase without back-extraction is proposed. ► The method requires low volume of sample and reagents. ► A low limit of detection, good precision and high enhancement factor were obtained. ► An application to mercury species determination in complex matrices was shown.