Preconcentration and spectrophotometric determination of mercury in water, food and hair samples through ionic-liquid induced micelle-mediated extraction

Abstract

A new, eco-friendly, and rapid micelle-mediated preconcentration technique was described for trace mercury in water, food and hair samples perior to its spectrophotometric determination. The developed method depended on cloud point extraction supported with ionic liquid (IL-CPE) for extraction of mercury utilizing a nonionic surfactant (Triton X-114) and 1-hexadecyl-3methylimidazolium chloride (C16MeImCl) ionic liquid, as an extracting phase in the presence of 5-benzyl-4-[4methoxybenzylideneamino)-4H-1,2,4-triazole-3-thiol (BMBATT) as a new chelating agent at pH 7.0. The influence of varous analytical variables on improving the extraction performance was tested. In the range of 2.0-600 µg L −1 , the calibration curve was linear with correlation coefficient of 0.9997. The detection limit and preconcentration factor were 0.4 µg L −1 and 100, respectively. The reliability and precision of the developed IL-CPE system as the relative standard deviation (RSD %) of 100 and 400 µg L −1 mercury were in the range 1.0 and 2.4%, respectively (n=10). The validity of the developed IL-CPE approach was confirmed by the analysis of certified reference materials (NIST-1641d mercury in natural water and NCS ZC81002B human hair). The applicability of proposed IL-CPE technique was demonstrated successfully by estimation of trace mercury in real water, food and hair samples.

Surfactant assisted spectrophotometric determination of copper(II), and mercury(II) in real samples using 2- amino-4-((4- nitrophenyl)diazenyl)pyridine-3-ol

“…To detect Hg(II), 1,5-diphenylthiocarbazone (dithizone) [37], azathia-crown ether dye [38], Thio-Michler's Ketone [39], 2-[(2-sulfanylphenyl) ethanimidoyl]phenol [40], 6-hydroxy-3-(2-oxoindolin-3ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one [41] and 2-Acetylpyridine thiosemicarbazone [42]. Some preconcentration and separation approaches were utilized for determination of the studied metals [43][44][45][46].…”

Ultrasound-assisted ionic liquid-based dispersive liquid-liquid microextraction procedure for preconcentration of cobalt and nickel in environmental and biological samples prior to FAAS determination

“…Using liquid-liquid microextraction as a sample enrichment method and ionic liquids (IL) as an extraction phase, analytical chemists have attempted to reduce or eliminate the dangerous toxic and volatile extraction solvents [42]. Because of their excellent physicochemical characteristics such as frivolous vapor pressure, economical, green, selective solubility, thermal stabilities, and good extractability for various organic compounds and metal ions, ionic liquids (ILs) have been used as environmentally friendly solvents [43][44][45].…”