In vitro monitoring of natural thorium in urine using fluorimeter
2011
Kalaiselvan, S. | Lakshmanan, A.R. | Meenakshisundaram, V.
A relatively less expensive and less time consuming radio analytical technique for quantitative determination of Thₙₐₜ in urine at mBq level is developed and reported in this paper. Th in urine is co-precipitated with Ca₃(PO₄)₂ from wet oxidized urine matrix and the precipitate is dissolved in HNO₃ and evaporated to dryness. The residue is dissolved in 3M HCl and 200mg of Na-EDTA is added to mask Ca²⁺, Mg²⁺ and Fe³⁺ ions. Th⁴⁺ is extracted into 0.01M PC-88A (2-ethyl hexyl phosphonic acid mono-2-ethylhexyl ester), dissolved in toluene from the experimentally optimized pH 2.5±0.3 in aqueous phase. Th⁴⁺ is stripped into 8.0M HCl and evaporated to dryness. The content of the beaker is dissolved in pH 1.8 HCl and complexed with 3-hydroxy flavone. The sample is excited at 397nm and fluorescence intensity is measured at 462nm. The detailed study of the method is presented in this paper. Interference study on elements that are normally present in urine and other actinides (if present) is also given.
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