Refractometry is an optical technique, primarily used to determine the concentration of a solute dissolved in liquid, by measuring the refractive index of the sample. Refractometry is also used for purity investigation of diamonds and forensic analysis of glass.
Refractometry is an optical technique, primarily used to determine the concentration of a solute dissolved in liquid, based on the refraction of light through the solution. The refractive index of a solution varies with the concentration of the solute, attributable to interactions between the transmitted light and solute molecules, as well as optical density effects. Refractive index depends on the wavelength of the incident beam and usually the incident beam has a wavelength of 589 nm, which is the Sodium ‘D’ line. The refractive index changes with temperature of the medium, with the rate of change depending on the medium. Refractometry is also used for purity investigation of diamonds and forensic analysis of glass.
The Refractometry technique involves measuring the refractive index of a test sample and comparing it with calibration standards, to obtain the solute concentration. The measurement is performed in a Refractometer.
Refractometers use the critical angle at which total internal reflection occurs, to measure the refractive index of a sample. There are four main types of fluid refractometers: traditional handheld refractometers, Abbe refractometers, digital refractometers and inline process refractometers.
Common Uses of Refractometry
Advantages of Refractometry
Limitations of Refractometry
Industrial Applications of Refractometry
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