Optics: measuring and testing – By dispersed light spectroscopy
Patent
1988-08-05
1989-06-06
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
356243, 2502521, 2524081, G01J 300
Patent
active
048366730
ABSTRACT:
A packaged test solution for determining the wavelength accuracy of variable wavelength liquid chromatography spectrophotometric detectors at one or more reference wavelengths consisting of 254.6, 378.9, 522.3, and 652.5 nanometers. The packaged solution comprises a hermetically sealed container of an effective concentration of erbium III ions such as a sealed container of a 0.2 molar solution of erbium III perchlorate in water. The test solution has the required intense absorption bands at the reference wavelengths which additionally do not vary by more than about 0.3 nanometers with the varying bandpass characteristics of such detectors. The invention is also a method comprising filling the cell of the detector with the test solution and varying the indicated wavelength of detection to find the indicated wavelength of maximum absorbance in a wavelength region around one of the reference wavelengths and then calculating the difference between the indicated wavelenth of maximum absorbance and the reference wavelength to determine the accuracy of the indicated wavelength of the detector.
REFERENCES:
patent: 4106857 (1978-08-01), Snitzer
patent: 4439347 (1984-03-01), Sun et al.
patent: 4461718 (1984-07-01), Kaye et al.
West et al, "Practical Standards for UV Absorption and Fluorescence Spectrophotometry", American Laboratory, vol. 9, No. 3 (Mar. 1977), pp. 37-49.
Moeller, T., and Brantley, J. C., The Rare Earths-Spectrophotometric Estimation of Certain Rare Earth Elements, Mar. 1950, Analytical Chemistry, vol. 22, No. 3, pp. 433-441.
Stewart, D. C., and Kato D., Analysis of Rare Earth Mixtures by a Recording Spectrophotometer, Feb. 1958, Analytical Chemistry, vol. 30, No. 2, pp. 164-172.
Evans F. L.
Stevens Timothy S.
The Dow Chemical Company
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