Ion hydration effects in the optical absorption and molecular vibration of water

5th Colombian Conference of Engineering Physics

物理学;工业技术

Moreno, Eduard^1 ; Janeth, Fernandez P.^1 ; Pinto, Sandra M.^1 ; Miranda, David A.^1

Universidad Industrial de Santander, Cra 27 Cll 9, Bucaramanga, Colombia^1

关键词: Attenuated total reflections;    Electrolyte solutions;    Electrolytic solution;    Extracellular environments;    Ionic concentrations;    Research studies;    Spectral region;    Water molecule;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/850/1/012014/pdf
DOI  :  10.1088/1742-6596/850/1/012014

学科分类：工业工程学

来源: IOP

【 摘 要 】

Hydration occurs when some ionic species are in pure water. In this research study, optical properties of an electrolytic solution with ionic species that emulated the extracellular environment were analyzed. The attenuated total reflection ATR-FTIR spectra and Raman spectra of electrolyte solutions were measured and the vibrational spectra of pure water (type A) with electrolyte solutions in the spectral region between 2700-4000 cm-1was compared. At low ionic concentrations of chloride, sodium, potassium and calcium, a weak effect on the spectrum of water was observed. We found a shifts in the absorption bands of water in IR (3286 cm-1and 3492 cm-1) and Raman spectra (3207 cm-1and 3432 cm-1), which increase with ionic concentration. This effect can be interpreted as a result of interactions between water molecules and solvated ions. This result suggests that the presence of ions in pure water modifies the optical properties of water.