Summary
Methods for the simultaneous preconcentration of lanthanides by cloud point extraction and their determination using neutron activation analysis have been developed. The preconcentration method involves the use of a nonionic surfactant and a chelating agent. A fairly small volume of surfactant-rich phase was obtained under optimized experimental conditions, leading to detection limits between 0.3 and 3.0 ng . g-1. Critical parameters that influence extraction efficiency were solution pH and concentration of chelating agent, and to a lesser extent, ionic strength and temperature. Most of the chelates were quantitatively extracted (>90%) at high pH values. Selective separation can be achieved by varying some of the experimental conditions.
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Pérez-Gramatges, A., Chatt, A. Preconcentration neutron activation analysis of lanthanides by cloud point extraction using PAN. J Radioanal Nucl Chem 269, 491–497 (2006). https://doi.org/10.1007/s10967-006-0413-1
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DOI: https://doi.org/10.1007/s10967-006-0413-1