Time dependent FTIR spectra of mineral waters after contact with air

TL;DR

This study analyzes how FTIR spectra of mineral waters change over time after exposure to air, revealing insights into structural changes and catalytic activity loss, with implications for medical and storage practices.

Contribution

It provides the first detailed kinetic analysis of FTIR spectral changes in mineral waters upon air contact, linking spectral behavior to catalytic activity loss.

Findings

Spectral changes are independent of chemical contamination and degassing.

Characteristic spectral change time is approximately 669 seconds.

Spectral behavior correlates with catalytic activity loss.

Abstract

FTIR spectra of mineral waters of Slavyanovskaya, Aqua Montana, Bad Harzburger and Christinen with time from first contact of water with open air were analysed. The kinetic of spectral changes of Slavyanovskaya mineral water in the regions of stretch, deformation and intermolecular vibrations was measured. The spectral changes do not correlate with chemical contamination of mineral water and degassing process. The observed spectral changes could be due to different structure of mineral water in liquid state, which is destroyed after air contact. The observed spectral behaviour of Slavyanovskaya is correlated with the catalytic activity of mineral water, which was saved without contact with air. The characteristic time of spectral dependence (669 seconds) is close to the characteristic time of catalytic activity loss (600 seconds) of mineral water at air contact. The spectra results support the medical studies that show the activity of mineral water near spring, and the loosing activity of water after long time storing.