新型低折射率液体折射率标准：标准参考物质1922

New low-index liquid refractive index standard: SRM 1922.

作者信息

Verkouteren J R, Leigh S D

机构信息

Surface and Microanalysis Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

出版信息

Fresenius J Anal Chem. 2000 Jun;367(3):226-31. doi: 10.1007/s002160000348.

DOI:10.1007/s002160000348

PMID:11227449

Abstract

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.

摘要

已经制定了折射仪校准的新标准。标准参考物质（SRM）1922是一种矿物油，在20摄氏度时折射率nD = 1.46945，处于白利糖度范围（%蔗糖）内。已对15摄氏度至35摄氏度范围内折射率随温度的变化（dn/dT）进行了表征，以便在该温度范围内进行校准。通过使用最小偏向角法在可见光谱的5个波长处测量折射率，在20摄氏度时不确定度为±2 - 3×10⁻⁵。通过将二项式柯西函数拟合到测量波长处的值来确定nD和dnD/dT的值，在20摄氏度时nD的不确定度为±6×10⁻⁵。