Chernikovite and meta-ankoleite were synthesized with a relatively high crystallinity and the compounds were identified by means of chemical analysis and X-ray diffraction. The infrared spectra were recorded and the bands assigned. From the luminescence spectra, the band-gap energy for both compounds was calculated as 2.35 eV, indicating that they must be considered as insulators. The dependence of the solubilities of these compounds on the acidity of the solution was studied, and the dominant ionic species were determined. The pK~p values of chernikovite and meta-ankoleite were found to be 22.73_+0.24 and 24.30-t-0.81 respectively.
The magnesium, manganese and nickel uranyl oxide hydrates have been synthesized by the reaction of the appropriate metal salts with schoepite at elevated temperature. After separation from the reaction mixture, the chemical composition of the different compounds was determined, and the chemical formulae were calculated based on different structural hypotheses. X-Ray powder diffraction data were obtained from each of the three species. After indexing and unit-cell parameter determination, the most plausible space groups were proposed, and compared with the known space groups of existing uranyl oxide hydrates.Thermal analysis was performed to determine the character and the number of water molecules in the structures. The solubility and solubility products were determined, and the influence of the different uranyl species was evaluated. Finally, to examine the presence of a charged double layer, the zeta potential was determined.
The feasibility of resonance Raman spectroscopy in the detection of hazardous chemicals in water has been tested on some nitrophenol-based pesticides and fungicides. In most cases, detection limits below the parts per million level were obtained. The method was also tested on an artifically polluted river water sample.
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