Mercury(II) Ion-Selective Polymeric Membrane Sensors for Analysis of Mercury in Hazardous Wastes
| Autor: | Saad S. M. Hassan, Ali E. Kelany, Ayman H. K. Mohamed, Wagiha H. Mahmoud |
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| Rok vydání: | 2006 |
| Předmět: |
Hazardous Waste
Polymers Metal ions in aqueous solution Potentiometric titration Analytical chemistry chemistry.chemical_element Dithionitrobenzoic Acid Chemistry Techniques Analytical Vinyl chloride Analytical Chemistry Ion chemistry.chemical_compound Cold vapour atomic fluorescence spectroscopy Polyvinyl Chloride Ions Detection limit Ionophores Chemistry Spectrophotometry Atomic Mercury Hydrogen-Ion Concentration Mercury (element) Thiazoles Membrane Models Chemical Calibration Potentiometry Dental Alloys |
| Zdroj: | Analytical Sciences. 22:877-881 |
| ISSN: | 1348-2246 0910-6340 |
| DOI: | 10.2116/analsci.22.877 |
| Popis: | Two novel potentiometric sensors that are highly selective to Hg2+ ions are described. These are based on the use of 5,5'-dithio-bis(2-nitrobenzoic acid) (DTNB) and tricyclazole (TCZ) as neutral carriers in plasticized poly(vinyl chloride) membranes. Fast Nernstian responses are obtained for Hg2+ ions over the concentration ranges 7.0 x 10(-6) - 1.0 x 10(-2) and 7.7 x 10(-6) - 1.0 x 10(-2) mol l(-1) at pH 1.8 - 3.3 with lower detection limits of 5.0 x 10(-6) and 5.6 x 10(-6) mol l(-1) (approximately 1 microh ml(-1)) and calibration slopes of 30.0 and 29.7 mV decade(-1) with DTNB- and TCZ-based membrane sensors, respectively. Validation of the assay method reveals good performance characteristics, including long life span, good selectivity for Hg2+ ions over a wide variety of other metal ions, long term response stability, and high reproducibility. Applications for direct determination of mercury in hazardous wastes including dental amalgam, mercury bulbs, and fluorescent lamps give results with good correlation with data obtained using cold vapor atomic absorption spectrometry. |
| Databáze: | OpenAIRE |
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