An ionic liquid-based microextraction method for highly selective and sensitive trace determination of nickel in environmental and biological samples

Abstract

Nickel was complexed with BTAHQ at pH 4.0. The IL-DLLME procedure was performed by using a few mL of [C₆mim][PF₆] as the extractant while methanol was the disperser solvent. The Ni-enriched RTIL phase was solubilized in methanol and the absorbance at<italic>λ</italic>_max682 was directly measured against a reagent blank similarly prepared.