Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 48, Issue 2, Pages 314-322Publisher
WILEY
DOI: 10.1002/jrs.5039
Keywords
quantitative Raman spectroscopy; water; NaCl; Raman scattering cross section; temperature
Categories
Funding
- National Sciences Foundation of China [41102154, 41176047]
- Key Project of Chinese Ministry of Education [109108]
- Program of Introducing Talents of Discipline to Universities by Ministry of Education [B14031]
- CNRS
- Universite de Lorraine
- ANR Program (SEED, CGS Microlab)
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Water is often used as an internal standard in quantitative Raman spectroscopic measurements of dissolved species in aqueous solutions containing salts at varying temperatures. However, the effects of temperature and dissolved ions on the relative differential Raman scattering cross section (RSCS) of the OH-stretching vibration band of water at elevated temperatures and salinities are not well defined quantitatively. In this study, the Raman spectra of NaCl solutions with different salinity (from 0 to 5 mol NaCl/kg center dot H2O) at 20 degrees C at atmospheric pressure and from 0 to 300 degrees C at 30MPa were studied. The relative RSCS of the OH-stretching vibration band of liquid water (sigma((mNaCl, T, 30MPa)/)sigma((Pure water, 20 degrees C, 30 MPa))) as a function of temperature (T, in degrees C) and salinity (mNaCl, in mol/kg center dot H2O) was established: sigma((mNaCl, T, 30MPa)/)sigma((Pure water, 20 degrees C, 30 MPa))) = f(t, mNaCl) = a(T-20)+b where a = 0.000089 x mNaCl(1/2) - 0.001164; b = 0.0355 x mNaCl + 1; The RSCS of the OH-stretching vibration band of water in pseudo back-scattering geometry decreases linearly with increasing temperature, but increases with the addition of dissolved NaCl within the whole temperature range. The enhancement factor of the RSCS by dissolved NaCl increases with temperature. Such effects of temperature and salinity should be considered in quantitative Raman spectroscopic study of species concentration in aqueous solution at high temperature when using water as internal standard. Copyright (C) 2016 John Wiley & Sons, Ltd.
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