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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 24, Number 1
BKCSDE 24(1)
January 20, 2003 

Titanium Acetylacetonate as an Excellent Ion-Carrier in Construction of Iodide Sensor
Mohammad Reza Ganjali, Azadeh Daftari, Farhang Mizani, Masoud Salavati-Niasari
Titanium acetylacetonate, Iodide sensor, Potentiometry, PVC
Titanium acetylacetonate was used in the construction of a PVC-based membrane electrode. This sensor shows very good selectivity for iodide ion over a wide variety of common inorganic and organic anions. It exhibits Nernstian behavior with a slope of 59.1 mV per decade. The working concentration ranges of the sensor are 1.0 ´ 10-1-5.0 ´ 10-6 M with a detection limit of 3.0 ´ 10-6 M. The response time of the sensor is very fast (<8 s), and can be used for at least twelve weeks in the pH range of 4.0-9.2. The best performance was obtained with a membrane composition of 30% PVC, 65% dibutylphthalate, 3% titanium acetylacetonate and 2% hexadecyltrimethylammonium bromide. The proposed sensor was successfully applied as an indicator electrode for titration of iodide with silver ion.
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