Related Experiment Video
Updated: Jun 10, 2026
05:52
Observation and Analysis of Blinking Surface-enhanced Raman Scattering
Published on: January 11, 2018
Experimental study of NaCl aqueous solutions by Raman spectroscopy: towards a new optical sensor
Ivana Duricković1, Mario Marchetti, Rémy Claverie
1Laboratoire Matériaux Optiques, Photonique et Systèmes, University Paul Verlaine of Metz and Supélec-2 rue Edouard Belin, 57070 Metz, France. Ivana.Durickovic@developpement-durable.gouv.fr
Applied Spectroscopy
|August 20, 2010
Summary
Raman spectroscopy accurately determines NaCl concentration in aqueous solutions near the freezing point. This method offers a precise way to measure salt levels, crucial for understanding phase transitions.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Solution Chemistry
Background:
- Understanding the behavior of aqueous solutions, particularly sodium chloride (NaCl), is vital for various scientific and industrial applications.
- The solid-liquid phase transition of salt solutions is influenced by concentration and temperature, affecting properties like freezing point.
- Raman spectroscopy offers a non-destructive method to probe molecular vibrations and interactions within solutions.
Purpose of the Study:
- To investigate the effects of NaCl concentration on water's OH stretching band using Raman spectroscopy.
- To explore the utility of micro-Raman spectroscopy in characterizing NaCl aqueous solutions around their phase transition.
- To establish Raman spectroscopy as a reliable method for determining salt concentration in aqueous solutions.
Main Methods:
- Utilized micro-Raman spectroscopy to analyze NaCl aqueous solutions.
- Conducted experiments across a temperature range of -21 to 10 degrees C.
- Examined solutions with NaCl concentrations varying from 0 to 200 g/L.
Main Results:
- Observed distinct modifications in the OH stretching band of water due to NaCl presence.
- Demonstrated a correlation between spectral features and NaCl concentration.
- Achieved salt concentration determination with an accuracy of approximately +/-5%.
Conclusions:
- Micro-Raman spectroscopy is a sensitive technique for analyzing NaCl aqueous solutions near the solid-liquid phase transition.
- The spectral changes in water's OH band serve as an effective marker for salt concentration.
- This spectroscopic approach provides a precise and efficient method for quantifying NaCl in aqueous systems.
Related Concept Videos
01:26Raman Spectroscopy Instrumentation: Overview
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
01:20Raman Spectroscopy: Overview
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...