Abstract
This work aims to discuss quantification of rare earth metals in a complex mixture using the novel multi-ionophore approach based on potentiometric sensor arrays. Three compounds previously tested as extracting agents in reprocessing of spent nuclear fuel were applied as ionophores in polyvinyl chloride (PVC)-plasticized membranes of potentiometric sensors. Seven types of sensors containing these ionophores were prepared and assembled into a sensor array. The multi-ionophore array performance was evaluated in the analysis of Ln3+ mixtures and compared to that of conventional monoionophore sensors. It was demonstrated that a multi-ionophore array can yield RMSEP (root mean-squared error of prediction) values not exceeding 0.15 logC for quantification of individual lanthanides in binary mixtures in a concentration range 5 to 3 pLn3+.
Highlights
This work aims to discuss quantification of rare earth metals in a complex mixture using the novel multi-ionophore approach based on potentiometric sensor arrays
Three compounds previously tested as extracting agents in reprocessing of spent nuclear fuel were applied as ionophores in polyvinyl chloride (PVC)-plasticized membranes of potentiometric sensors
Ln3+ detection in complex media is a part of rare earth element (REE) ore mining and spent nuclear fuel (SNF) reprocessing to estimate the accompanying REE-induced biological and environmental effects
Summary
Quantitative analysis of rare earth element (REE) mixtures is a challenging analytical task due to the significant similarity of the chemical properties of lanthanides. Ln3+ detection in complex media is a part of REE ore mining and spent nuclear fuel (SNF) reprocessing to estimate the accompanying REE-induced biological and environmental effects. As REEassociated toxicity is confined mainly to Ce, La and Gd, the separate quantification of lanthanides, and estimating the accompanying REE-induced biological and environmental effects, are problems of utmost importance. This task is typically handled with heavy analytical instruments such as, e.g., inductively coupled plasma mass spectrometry (ICPMS). High accuracy and reproducibility of the method requires expensive equipment and is not suitable for operating in an on-line mode
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