Estimation of Tb3+ by mellitic acid sensitized luminescence in methanol
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+.
Analytical chemistry, Luminescence, Rare earths, Lanthanides, Terbium, Mellitic acid
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