Preconcentration of rare earth quinolin-8-ol complexes onto activated carbon and determination by first-order derivative x-ray fluorescence spectrometry
✍ Scribed by V. Bhagavathy; M.L.P. Reddy; P.S.T. Sai; T.Prasada Rao; A.D. Damodaran
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 366 KB
- Volume
- 242
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A method is described for the determination of traces of rare earths using energy-dispersive x-ray fluorescence spectrometry (EDXRF) after preconcentration of their quinolin-8-01 complexes on activated carbon. Various parameters that influence the adsorptive preconcentration of rare earths on activated carbon, viz., pH, amounts of activated carbon and quinolin-8-01, time of stirring and aqueous phase volume, were systematically studied. A numerical method based on a simple least-squares procedure using a fifth-order polynomial with 25 consecutive values was developed for smoothing and differentiation of EDXRF data which were previously digitized and averaged. First-order derivative EDXRF in conjunction with adsorptive preconcentration of activated carbon enables down to 10 ng ml-' of each rare earth element to be determined.