TITLE

Naked eye detection of cadmium using inorganic–organic hybrid mesoporous material

AUTHOR(S)
Balaji, Tatineni; Sasidharan, Manickam; Matsunaga, Hideyuki
PUB. DATE
January 2006
SOURCE
Analytical & Bioanalytical Chemistry;Jan2006, Vol. 384 Issue 2, p488
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A novel and low-cost optical sensor for the naked eye detection of Cd2+in aqueous media based on mesoporous silica containing 4-(2-pyridylazo)resorcinol (PAR) as a probe molecule anchored by N-trimethoxysilylpropyl- N, N, N-trimethylammonium chloride (TMAC) was prepared. The effects of various factors such as pH, solvent volume, temperature, reaction time, amount of the material, and the presence of various ions were studied in order to optimize operating conditions. The detection was based on the color change of PAR from orange-yellow to purple as a result of complexation with Cd2+. The intensity of the Cd-PAR complex varies linearly with the Cd2+concentration, from zero to 1.78×10−7 mol dm−3. The detection and quantification limits for the method when determining Cd2+ were 1.75×10−8 and 5.77×10−8 mol dm−3, respectively, with a correlation coefficient of 0.99. Good chemical stability of the material was observed for a period of five months. The developed sensor was applied to the analysis of various industrial effluents and tap water samples.
ACCESSION #
19274298

 

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