Abstract
Actinide elements in near neutral aqueous solutions are involved in a variety of chemical reactions such as hydrolysis, complexation, redox reaction, sorption and precipitation. Study of these reactions necessitates identification of chemical and physical forms of actinide species (speciation). Photoacoustic spectroscopy (PAS) has been widely used for studying samples in the form of solids, liquids and gases. For actinide elements in solution, laser-induced PAS (LPAS) has been successfully applied in the past several years, and provided valuable information of the speciation and the microscopic chemical behavior(1)(3). However, little progress has been made for sorbed and precipitated actinide species. We have initiated applications of PAS techniques to speciate lathanide and actinide elements in aqueous phase/adsorbent/precipitate systems ; LPAS has been developed for aqueous species, and the ultraviolet-visible-near infrared (UV-VIS-NIR) PAS and Fourier transform infrared (FT-IR) PAS for adsorbed and precipitated species. These techniques all offer the advantages of PAS : a direct non-perturbing detection, minimal sample preparation, versatility in shape of sample, and high sensitivity. As the first step of the applications of PAS to the speciation, we carried out the measurement on photoacoustic spectra of lanthanide solutions and solids. This note focuses on some results of neodymium, intended to illustrate the efficacy of PAS as a versatile technique for lanthanide speciation. The PAS equipments and procedures we applied are briefly described.
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