Investigation of 3-amino-1,2,4-triazole azodye derivatives as reagents for determination of mercury(II)
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Abdalla Khedr
Abstract
The reaction of mercury(II) with 3-(2,4-dihydroxyphen-1-ylazo)-1,2,4-triazole (HL1), 3-(2-hydroxy-5-methylphen-1-ylazo)-1,2,4-triazole (HL2), 3-(2-hydroxy-5-ethoxycarbonylphen-1-ylazo)-1,2,4-triazole (HL3), 3-(2-hydroxy-5-acetylphen-1-ylazo)-1,2,4-triazole (HL4), 3-(2-hydroxy-5-formylphen-1-ylazo)-1,2,4-triazole (HL5), and 3-(2-hydroxy-5-bromophen-1-ylazo)-1,2,4-triazole (HL6) was studied. A new, direct, and simple procedure was suggested for the spectrophotometric determination of mercury(II) based on its complexation reaction with HL1-HL6. The best reagent was found to be HL3 due to its high sensitivity and selectivity. In aqueous media of pH 9.0 containing 40 vol. % of methanol, Hg(II) reacts with HL3 to form a 1:2 (Hg(II) · HL3) complex having a sensitive absorption peak at 490 nm with the molar extinction coefficient of 3.31 × 104 L mol−1 cm−1 using 4 × 10−4 M of the reagent. Beer’s law is obeyed over the range from 0.00 µg mL−1 to 12.04 µg mL−1 of mercury(II). The proposed method was applied in the determination of mercury(II) in tap water, seawater and synthetic seawater samples, without the need of prior treatment, with satisfactory results.
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© 2008 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Investigation of 3-amino-1,2,4-triazole azodye derivatives as reagents for determination of mercury(II)
- Electrospray ionization mass spectra of pentoses, hexoses, and 2-deoxy-2-fluoro-d-glucose
- Influence of solution composition and iron powder characteristics on reduction of 2,4,6-trinitrophenol
- Electrochemical behaviour of lanthanum fluoride in molten fluorides
- Structural and electronic effects involving pyridine rings in 4-methylpyridine Cu4OX6L4 complexes. II. Correlations based on molecular structure of the Cu4OCl6(4-Mepy)4 complex
- Photoswitching of a heptanuclear FeII-FeIII complex — A case of multifunctional magnetic materials
- Collagen-grafted ultra-high molecular weight polyethylene for biomedical applications
- Synthesis of macrocyclic polyethers and polyether diesters and preparation of their cationic complexes
- Prediction of anti-HIV activity and cytotoxicity of pyrimidinyl and triazinyl amines: A QSAR study
- Composition of the essential oil of Geocaryum cynapioides (Guss.) L. Engstrand
- Photolytic degradation of triclosan in the presence of surfactants
- Determination of dissociation degrees of K3NbF8 and K3TaF8 by thermodynamic analysis of subsystems of the KF-K2NbF7 and KF-K2TaF7 systems
- DFT-based quantum theory QSPR studies of molar heat capacity and molar polarization of vinyl polymers
- Silica sulfuric acid-catalyzed expeditious environment-friendly hydrolysis of carboxylic acid esters under microwave irradiation
- Rhizopus stolonifer LAU 07: a novel source of fructosyltransferase
