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001-es BibID:BIBFORM093113
Első szerző:Kocúrová, Lívia
Cím:Application of a bisindocarbocyanine reagent for dispersive liquid-liquid microextraction of silver with subsequent spectrophotometric determination / Lívia Kocúrová, Ioseph S. Balogh, Lajos Nagy, Ferenc Billes, András Simon, Vasil Andruch
Dátum:2011
ISSN:0026-265X
Megjegyzések:A novel, simple and environmentally friendly procedure for silver determination has been developed. The method is based on ion associate formation of AgI2? and bisindocarbocyanine chloride (BDIC) reagent, followed by dispersive liquid?liquid microextraction (DLLME) of the ion associate formed and subsequent UV?Vis spectrophotometric detection. The structure of BDIC and the reaction mechanism were investigated by MS and NMR measurements and quantum chemical calculations.The optimum experimental conditions were found to be: pH 6; 0.1molL?1 KI; 5?10?5molL?1 BDIC. The DLLME procedure was carried out using an auxiliary solvent for adjustment of solvent density. A 0.5mL mixture of toluene as extraction solvent, carbon tetrachloride as auxiliary solvent and ethanol as disperser solvent was used. Ultrasonication of the organic phase was applied to decrease the value of the blank test. The absorbance of the coloured extracts obeys Beer's law in the range 0.07?2.1mgL?1 of Ag at 566nm wavelength. The limit of detection, calculated from a blank test (n=10) based on 3s, is 0.03mgL?1 of Ag. The developed procedure was applied to the determination of silver in real samples such as Nano Silver and semi-conductor thin films.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Silver
Bisindocarbocyanine reagent
Dispersive liquid?liquid microextraction
Auxiliary solvent
Ultrasound
Megjelenés:Microchemical Journal. - 99 : 2 (2011), p. 514-522. -
További szerzők:Balogh Ioseph S. Nagy Lajos (1979-) (vegyész) Billes Ferenc Simon András Andruch, Vasil
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001-es BibID:BIBFORM093111
Első szerző:Škrlíková, Jana
Cím:A novel, environmentally friendly dispersive liquid-liquid microextraction procedure for the determination of copper / Jana Škrlíková, Vasil Andruch, Ioseph S.Balogh, Lívia Kocúrová, Lajos Nagy, Yaroslav Bazeľ
Dátum:2011
ISSN:0026-265X
Megjegyzések:A novel, simple and environmentally friendly procedure for copper determination has been developed. The method is based on the formation of an ion associate of Cu(I) with 1,3,3-trimethyl-2-[5-(1,3,3-trimethyl-1,3-dihydroindol-2-ylidene)-penta-1,3-dienyl]-3H-indolium (DIDC) in the presence of chloride ions as ligand, followed by dispersive liquid?liquid microextraction (DLLME) of the formed ion associate into organic phase and UV?Vis spectrophotometric detection. The following experimental conditions were used: pH 3, 0.24 mol L? 1 chloride ions, 0.06 mmol L? 1 DIDC. The effect of the nature of the extraction solvent, auxiliary solvent and disperser solvent used was studied. A mixture of amyl acetate, tetrachloromethane, and methanol in a 1:1:3 v/v/v ratio was selected for the DLLME procedure. The absorbance of the coloured extracts at 640 nm wavelength obeys Beer's law in the range 0.020?0.090 mg L? 1 of Cu. The limit of detection calculated from a blank test (n = 10) based on 3s is 0.005 mg L? 1 of Cu. The developed procedure was applied to the analysis of water samples. The suggested DLLME is compared with two procedures previously reported from our laboratory based on (1) conventional liquid?liquid extraction, and (2) sequential injection extraction performed in a dual-valve sequential injection system. The advantages and disadvantages of each method are discussed.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
UV-Vis spectrophotometry
Copper
Megjelenés:Microchemical Journal. - 99 : 1 (2011), p. 40-45. -
További szerzők:Andruch, Vasil Balogh Ioseph S. Kocúrová, Lívia Nagy Lajos (1979-) (vegyész) Bazel, Yaroslav R.
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Intézményi repozitóriumban (DEA) tárolt változat
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