A new dispersive liquid–liquid microextraction using ionic liquid based microemulsion coupled with cloud point extraction for determination of copper in serum and water samples

• Published in: Ecotoxicology and environmental safety 2016-04, Vol.126, p.186-192
• Main Authors: Arain, Salma Aslam, Kazi, Tasneem Gul, Afridi, Hassan Imran, Arain, Mariam Shahzadi, Panhwar, Abdul Haleem, Khan, Naeemullah, Baig, Jameel Ahmed, Shah, Faheem
• Format: Article
• Language: English
• Subjects: Adolescent; Cloud point extraction; Copper; Copper - analysis; Copper - blood; Copper - isolation & purification; Dispersive liquid–liquid microextraction; Drinking Water - chemistry; Female; Flame atomic absorption spectrometry; Hepatitis C - blood; Hepatitis C virus; Humans; Imidazoles - chemistry; Ionic liquid; Ionic Liquids - chemistry; Liquid Phase Microextraction - methods; Phase inversion method; Polyethylene Glycols - chemistry; Spectrophotometry, Atomic; Surface-Active Agents - chemistry; Water - chemistry
• ISSN: 0147-6513; 1090-2414
• DOI: 10.1016/j.ecoenv.2015.12.035

A simple and rapid dispersive liquid–liquid microextraction procedure based on ionic liquid assisted microemulsion (IL-µE-DLLME) combined with cloud point extraction has been developed for preconcentration copper (Cu2+) in drinking water and serum samples of adolescent female hepatitits C (HCV) patients. In this method a ternary system was developed to form microemulsion (µE) by phase inversion method (PIM), using ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim][PF6]) and nonionic surfactant, TX-100 (as a stabilizer in aqueous media). The Ionic liquid microemulsion (IL-µE) was evaluated through visual assessment, optical light microscope and spectrophotometrically. The Cu2+ in real water and aqueous acid digested serum samples were complexed with 8-hydroxyquinoline (oxine) and extracted into IL-µE medium. The phase separation of stable IL-µE was carried out by the micellar cloud point extraction approach. The influence of of different parameters such as pH, oxine concentration, centrifugation time and rate were investigated. At optimized experimental conditions, the limit of detection and enhancement factor were found to be 0.132µg/L and 70 respectively, with relative standard deviation 1 week at 25 °C.•IL-µEM is a hydrophobic/ hydrophilic microdomains, enhance the extraction efficiency.•The hepatitis C patients have high levels of Cu in serum than healthy controls.