Dispersive Liquid-Liquid Microextraction of Nickel Prior to Its Determination by Microsample Injection System-Flame Atomic Absorption Spectrometry

Abstract

A sensitive and simple method for the determination of trace nickel was developed by the combination of dispersive liquid-liquid microextraction (DLLME) and microsample injection system-flame atomic absorption spectrometry (MIS-FAAS). Trace nickel was preconcentrated as the 8-hydroxyquinoline chelate by DLLME, and the conditions were optimized by a Plackett-Burman design. Quantitative recovery of nickel (98 ± 1%) was obtained by a sample volume of 7.5 mL at a pH of 6.0. The enrichment factor was 52.5, and the limits of detection and quantitation were 0.1 µ g L-1 and 3.0 µ g L-1, respectively. The method was validated by the analysis of a wastewater standard reference material, water samples, and a wire sample. The reported method has superior analytical figures of merit compared with similar methods reported in the literature. © 2014 Taylor & Francis Group, LLC.