Preconcentration of nickel in waters by vortex assisted dispersive liquid-liquid microextraction

Abstract

The present work describes the attempt for the preconcentration of nickel ions by using vortex assisted dispersive liquid-liquid microextraction from aqueous samples. In this method, a small amount of chloroform is rapidly injected by syringe into the water sample containing nickel ions complexed by diethyldithiocarbamate (DDTC).This forms a cloudy solution. The cloudy state is the result of chloroform fine droplets formation, which are dispersed in bulk aqueous sample. Therefore, Ni-DDTC complex is extracted into the fine chloroform droplets and vortex agitation takes place during six minutes. After optimization of experimental variables and determination of analytical characteristics, the method is evaluated for application in real samples. HPLC is used as separation and detection system.

An eco-friendly ultrasound-assisted deep eutectic solvent-based liquid–phase microextraction method for enrichment and quantification of nickel in environmental samples

“…The DLLME technique has many advantages, including simplicity, speed, cheap cost, ease of use, green solvent use, and high enrichment factors. Many improved liquid-phase microextraction (LPME) methods for Ni(II) separation and microextraction from diverse sources have recently been developed and described [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

An Eco-Friendly Ultrasound-Assisted Emulsification Dispersive Liquid–Liquid Microextraction of Nickel in Environmental Samples Coupled with Spectrophotometry

“…DLLME is a simple and fast microextraction technique based on the use of a green extractant and disperser solvents with high miscibility in both extractant and aqueous phase. Recently, many advanced methods of DLLME have been developed and reported for the preconcentration and microextraction of inorganic and organic contaminants from environmental samples [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Because the high cost and energy consuming of the analytical instruments coupled with DLLME, spectrophotometer is an ordinary instrument but very cost-effective and widely used even in some less developed area.…”