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Title: Estimation of Tb3+ by mellitic acid sensitized luminescence in methanol
Authors: Maji, S
Kumar, Satendra
Sankaran, K
Keywords: Analytical chemistry;Luminescence;Rare earths;Lanthanides;Terbium;Mellitic acid
Issue Date: Oct-2017
Publisher: NISCAIR-CSIR, India
Abstract: Mellitic acid sensitized luminescence of Tb3+ in methanol exhibits a strong emission which is about 500 times more intense than that observed in water. Under optimal conditions, the luminescence intensity exhibits an excellent linear relationship in the concentration range of 5 × 10-10–5 × 10-8 M with a detection limit of 3 × 10-11 M. The interferences due to other lanthanides have been examined and found to be tolerated up to about 100-fold excess and hence estimation of Tb3+ in the presence of excess of lanthanides is possible. This method has been applied to the estimation of Tb3+ in simulated rare earth and tap water samples and the result is comparable to the result obtained from ICP-MS. Mechanism of enhanced luminescence is also proposed. This is the first report where mellitic acid sensitized luminescence is applied for the estimation of Tb3+.
Page(s): 1034-1040
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.56A(10) [October 2017]

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