Identifying the Elusive Framework Niobium in NbS-1 Zeolite by UV Resonance Raman Spectroscopy.

It was found that bands at 739, 963, and 1107 cm in the resonant Raman spectra are characteristics of framework penta-coordinated Nb -OH species, and that a band at 1336 cm in the UV Raman spectrum with excitation line at 320 nm is a sensitive detector for identifying extra-framework niobium species. The change of framework penta-coordinated Nb -OH species into Nb and NbO species due to dehydration was definitively confirmed based on UV resonance Raman and UV/Vis results.

Seasonal variations and size distributions of water-soluble ions in atmospheric aerosols in Beijing, 2012.

The characteristics of water-soluble ions in airborne particulate matter in Beijing were investigated using ion chromatography. The results showed that the total concentrations of ions were 83.7 ± 48.