a photoelectric instrument for measuring the concentration of a substance, as a transparent solution, by its of monochromatic light.


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  • Absorptiometry

    absorptiometry absorptiometry (əb-sôrp’tē-ŏm’ĭ-trē) A method of chemical analysis in which a sample of a substance is exposed to electromagnetic radiation, and the amount of radiation absorbed by the sample is measured. This measurement is then used to determine the concentration or chemical composition of the substance. Absorptiometry is used in medicine to measure bone density.

  • Absorption

    the act of . the state or process of being . assimilation; incorporation: the absorption of small farms into one big one. uptake of substances by a tissue, as of nutrients through the wall of the intestine. a taking in or reception by molecular or chemical action, as of gases or liquids. Physics. the removal […]

  • Absorption band

    a dark band in the absorption spectrum of a substance, corresponding to a range of wavelengths for which the substance absorbs more strongly than at adjacent wavelengths. Historical Examples Where the curve is highest there the absorption band is thickest; where the curve is lowest there the band is weak. Poisons: Their Effects and Detection […]

  • Absorption chromatography

    absorption chromatography absorption chromatography n. See chromatography.

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