New low-index liquid refractive index standard: SRM 1922
Copyright policy )New low-index liquid refractive index standard: SRM 1922
A new standard for the calibration of refractometers has been developed. Standard Reference Material (SRM) 1922 is a mineral oil with a refractive index nD = 1.46945 at 20 degrees C, which is within the range of the Brix scale (% sucrose). The change in refractive index with temperature (dn/dT) has been characterized for the range 15 degrees C to 35 degrees C to allow for calibrations within that range of temperatures. The refractive indices were measured at 5 wavelengths in the visible spectrum by using the method of minimum deviation with a +/- 2-3 x 10(-5) uncertainty at 20 degrees C. The values of nD and dnD/dT were determined by fits of a two-term Cauchy function to the values at the measured wavelengths with a +/- 6 x 10(-5) uncertainty in nD at 20 degrees C.
- National Institute of Standards and Technology United States
Refractometry, Calibration, Temperature, Mineral Oil, Guidelines as Topic, Reference Standards, Food Analysis
Refractometry, Calibration, Temperature, Mineral Oil, Guidelines as Topic, Reference Standards, Food Analysis
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