%0 Journal Article %A Sunan Payungsak and Atchana Wongchaisuwat and Ladda Meesuk %D 2012 %J International Journal of Chemical and Molecular Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 67, 2012 %T [Ca(2,2'-bipyridine)3]2+ -Montmorillonite: A Potentiometric Sensor for Sulfide ion %U https://publications.waset.org/pdf/3449 %V 67 %X Sulfide ion (S2-) is one of the most important ions to be monitored due to its high toxicity, especially for aquatic organisms. In this work, [Ca(2,2'-bipyridine)3]2+-intercalated montmorillonite was prepared and used as a sensor to construct a potentiometric electrode to measure sulfide ion in solution. The formation of [Ca(2,2'- bipyridine)3]2+ in montmorillonite was confirmed by Fourier Transform Infrared spectra. The electrode worked well at pH 4-12 and 4-10 in sulfide solution 10-2 M and 10-3 M, respectively, in terms of Nernstian slope. The sensor gave good precision and low cost. %P 608 - 611