Abstract
Koch and Kaplan's criticism1 of the E (1 percent, 1 cm.) value does not distinguish between absolute and abridged spectrophotometers2. The context indicates that only the abridged type (employing light filters) is in question ; yet E (1 percent, 1 cm.) is an essentially monochromatic convention that strictly applies to absolute instruments only, and that pertains not to colorimetry but photometry. Moreover, E (1 percent, 1 cm.) is merely a standard expression that does not carry the implication that one must measure the optical density of a 1 percent solution in a 1 cm. cell any more than a determination of the coefficient of expansion calls for measurements on a 1 cm. length of material heated through 1° C.
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References
Koch, W., and Kaplan, D., Nature, 159, 273 (1947).
Taylor, R. J., Analyst, 71, 566 (1946).
Twyman, F., and Lothian, G. F., Proc. Phys. Soc. (Lond.), 46, 643 (1933).
Edisbury, J. R., Analyst, 65, 484 (1940).
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EDISBURY, J., TAYLOR, R. & GRIDGEMAN, N. Units in Photo-Electric Absorptiometry. Nature 159, 777 (1947). https://doi.org/10.1038/159777a0
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DOI: https://doi.org/10.1038/159777a0
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