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In this research, we constructed chemical sensor for determining mercury in contaminated water because we needed fast,
simple, low-cost, and accurate determination of mercury in different environmental systems. The constructed membrane
composed of polyvinyl chloride PVC as a matrix material, 1, 5-diphenylthiocarbazone (dithizone) as electroactive compound,
and di-n-butyl phthalate (DBPH) as a plasticizer. The optimum membrane composition 30% PVC, 65% DBPH, 5% dithizone
exhibited the better Nernstian response. The results showed that probe is high stability along the pH range from (3.5 to 8). The
electrode displays a linear log [Hg
2+
] versus Electromotive force (EMF) response over a wide concentration range of (5×10
−6
to
1×10
−2
M) with Nernstian slope of 29.7±0.5 mV decade-1 and limit of detection 3×10
−6
M. The proposed sensor shows relatively
high selectivity for mercury ion in different matrix solution, other ions had negligible interference effect on the reading.
Keywords:
Ion selective electrodes, Polymeric membranes, Determination of Mercury.
Biography
Ahmed Khudhair Hassan has completed his Ph.D. from Baghdad University in 2010. He is senior scientific researcher in Environment & Water
Research & Technology Directorate, Ministry of Science & Technology, Iraq. He has published several papers in reputed journals.
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