Deep-UV Raman spectroscopy is a promising method for the analysis of nitrates and nitrites in water at ppm (mg/l) concentrations. In addition to the high sensitivity, the tunability of the laser source allows to deeper investigate the photoinduced reactions taking place under deep-UV illumination. Under these conditions, nitrate ions decompose into oxygen and nitrite through different reaction pathways. Analysis of the evolution of nitrate and nitrite Raman modes as a function of the excitation wavelength allows for estimating the photo-energy dependent quantum yield of the photolysis process. The results highlight the limits and capabilities of deep UV Raman as a on-line nitrate and nitrite monitoring method.

Date Published: 9 September 2019
PDF: 9 pages
Proc. SPIE 11086, UV and Higher Energy Photonics: From Materials to Applications 2019, 1108605 (9 September 2019); doi: 10.1117/12.2529383

Published in SPIE Proceedings Vol. 11086:
UV and Higher Energy Photonics: From Materials to Applications 2019
Gilles Lérondel; Yong-Hoon Cho; Atsushi Taguchi; Satoshi Kawata, Editor(s)