Ion Pair-Dispersive Liquid-Liquid Microextraction Coupled to Microsample Injection System-Flame Atomic Absorption Spectrometry For Determination of Gold at Trace Level in Real Samples

Abstract

A novel ion pair-dispersive liquid-liquid microextraction (IP-DLLME) of gold followed by its determination with microsample injection system -flame atomic absorption spectrometry (MIS-FAAS) was developed. The extraction method was based on the reaction of anionic tetrachloro gold(III) complex with the cationic form of Rhodamine B to give a violet ion pair complex, which is extracted from 1.0 mol L -1 HCl solution of 8.0 mL to fine droplets of chloroform of 500 μL. A Plackett-Burman experimental design of MINITAB statistical program was employed to optimize the influence of main parameters to be controlled in DLLME. After optimizing the extraction conditions, gold was quantitatively recovered by preconcentration factor 40, limit of detection (LOD) 1.8 μg L -1 and relative standard deviation less than 6.8%. The proposed method was successfully applied to the preconcentration and determination of gold in some samples such as tap water, waste water, copper electrolysis solution and copper wire coated with nickel.

Screening of Parabens in Natural Water by Salting-out Based Centrifugeless Dispersive Liquid-liquid Microextraction Combined with HPLC-UV

“…Because of its convenience and quickness, DLLME has been broadly applied for the extraction and preconcentration of numerous types of analytes from various matrices. 26,27 Recently, Rajabi et al has published a novel salting-out based centrifugeless DLLME method for the determination of some analytes in several matrices. 28,29 Herein, an organic solvent whose melting point is near the room temperature is dispersed into the sample solution to facilitate the extraction process.…”