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Author Hassan, Saad S. M. ♦ Mahmoud, W. H. ♦ Mohamed, Ayman H. K. ♦ Kelany, Ali E.
Source J-STAGE
Content type Text
Publisher The Japan Society for Analytical Chemistry
Language English
Abstract Two novel potentiometric sensors that are highly selective to $Hg^{2+}$ 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 $Hg^{2+}$ ions over the concentration ranges 7.0 × $10^{-6}$ - 1.0 × $10^{-2}$ and 7.7 × $10^{-6}$ - 1.0 × $10^{-2}$ mol $l^{-1}$ at pH 1.8 - 3.3 with lower detection limits of 5.0 × $10^{-6}$ and 5.6 × $10^{-6}$ mol $l^{-1}$ (∼1 µh $ml^{-1})$ 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 $Hg^{2+}$ 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.
ISSN 09106340
Learning Resource Type Article
Publisher Date 2006-01-01
e-ISSN 13482246
Journal Analytical Sciences(analsci)
Volume Number 22
Issue Number 6
Page Count 5
Starting Page 877
Ending Page 881


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