Solid phase extraction of inorganic mercury using 5-phenylazo-8-hydroxyquinoline and determination by cold vapor atomic fluorescence spectroscopy in natural water samples.
8-Hydroxyquinoline (8-HQ) was chosen as a powerful ligand for Hg solid phase extraction. Among several chelating resins based on 8-HQ, 5-phenylazo-8-hydroxyquinoline (5Ph8HQ) is used for mercury extraction in which the adsorption dynamics were fully studied. It has been shown that Hg(II) is totally absorbed by 5Ph8HQ within the first 30 minutes of contact time with t 1/2 5 minutes, following Langmuir adsorption model. At pH 4, the affinity of mercury is unchallenged by other metals except, for Cu(II), which have shown higher Kd value. With these latter characteristics, 5Ph8HQ was examined for the preconcentration of trace levels of Hg(II). The developed method showed quantitative recoveries of Hg(II) with LOD = 0.21 pg mL(-1) and RSD = 3-6% using cold vapor atomic fluorescence spectroscopy (CV-AFS) with a preconcentration factor greater than 250.
Université Lille 1, Equipe Chimie Analytique et Marine, UMR-CNRS 8217 Géosystèmes, Villeneuve d'Ascq Cedex, France.
Mirna
M
Daye
Université Lille 1, Equipe Chimie Analytique et Marine, UMR-CNRS 8217 Géosystèmes, Villeneuve d'Ascq Cedex, France.
Baghdad
B
Ouddane
Water & Environmental Sciences Laboratory (L.S.E.E), Lebanese University, Lebanon.
Jalal
J
Halwani
Université Lille 1, Equipe Chimie Analytique et Marine, UMR-CNRS 8217 Géosystèmes, Villeneuve d'Ascq Cedex, France.
Mariam
M
Hamzeh
D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical; D006863:Hydrogen-Ion Concentration; D006912:Hydroxyquinolines / Q000737:chemistry*; D007287:Inorganic Chemicals; D007700:Kinetics; D008024:Ligands; D013058:Mass Spectrometry; D008628:Mercury / Q000737:chemistry*; D008670:Metals / Q000737:chemistry; D015125:Oxyquinoline / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D052616:Solid Phase Extraction; D013050:Spectrometry, Fluorescence; D013054:Spectrophotometry, Atomic; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D014131:Trace Elements / Q000737:chemistry; D014867:Water / Q000737:chemistry
D001391:Azo Compounds; D006912:Hydroxyquinolines; D007287:Inorganic Chemicals; D008024:Ligands; D008670:Metals; D014131:Trace Elements; D014867:Water; D015125:Oxyquinoline; D012822:Silicon Dioxide; D008628:Mercury