Clinical Chemistry
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Clinical Chemistry 32: 162-165, 1986;
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Clinical Chemistry, Vol 32, 162-165, Copyright © 1986 by American Association for Clinical Chemistry

Monitoring the stability of wavelength calibration of spectrophotometers

WJ Korzun and WG Miller

The difference in absorbance (delta A) between equimolar acid and alkaline solutions of methyl red, at a wavelength near the isosbestic point of the indicator, is reproducible. Furthermore, this delta A is sensitive to changes in the wavelength calibration of the instrument used to make the measurement. The delta A of methyl red can be used to monitor wavelength accuracy in both manual and automated spectrophotometric instruments. Although this measurement does not establish wavelength calibration, it is useful for monitoring the wavelength accuracy of previously calibrated, automated spectrophotometers that do not easily lend themselves to calibration checks by conventional techniques.




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Copyright © 1986 by the American Association for Clinical Chemistry.