colorimetry

col·or·im·e·ter

C0490800 (kŭl′ə-rĭm′ĭ-tər)n.1. Any of various instruments used to determine or specify colors, as by comparison with spectroscopic or visual standards.2. An instrument that measures the concentration of a known constituent of a solution by comparison with colors of standard solutions of that constituent.

col′or·i·met′ric (-ər-ə-mĕt′rĭk) adj.col′or·i·met′ri·cal·ly adv.col′or·im′e·try n.

colorimetry

the measurement of the physical intensity of colors, as opposed to their subjective brightness. — colorimeter, n. — colorimetric, colorimetrical, adj.See also: Color

Thesaurus

Noun

colorimetry - quantitative chemical analysis by color using a colorimetercolorimetric analysisquantitative analysis, quantitative chemical analysis - chemical analysis to determine the amounts of each element in the substance

Translations

colorimétriecolorimetriaколориметрия

colorimetry

[‚kəl·ə′rim·ə·trē] (optics) Any technique by which an unknown color is evaluated in terms of standard colors; the technique may be visual, photoelectric, or indirect by means of spectrophotometry; used in chemistry and physics.

Colorimetry

(1) In analytical chemistry, colorimetry is a group of photometric methods of quantitative analysis based on the determination of the concentration of substances in a colored solution by measuring the amount of light absorbed by the solution. The amount of light absorbed, the thickness of the layer of solution, and the concentration of the solution are related by a formula that obeys the Bouguer-Lambert-Beer law:

(1) I = I_o · e^-kcl

where I is the intensity of light after passing through the absorbing medium, I_o is the intensity of the incident light, l is the thickness of the layer of solution (in cm), c is the concentration of the absorbing substance (in moles per liter), and K is a constant for light of a particular wavelength. After the logarithm is taken, equation (1) takes the form

(2) In (I_o/I) = Kcl = D

where D is the optical density of the solution. It follows from equation (2) that D is directly proportional to the concentration of the substance in the solution.

A distinction is made between subjective (visual) and objective (photocolorimetric) methods of colorimetry. In visual methods, the optical density is determined by comparing the color of the solution being studied with the colors of a series of standard solutions, as well as by using visual colorimeters. In objective methods, photoelectric colorimeters are used.

(2) In physics, colorimetry is the methodology of measuring and expressing color in quantitative terms, and also the set of such methods.

colorimetry

The science of measuring color. The International Commission on Illumination (Commission Internationale de l'Eclairage) governs this subject along with all aspects of lighting and illumination. See CIE Lab and colorimeter.

colorimetry

col·or·im·e·try

(kŭl'ŏr-im'ĕ-trē), A procedure for quantitative chemical analysis, based on comparison of the color developed in a solution of the test material with that in a standard solution; the two solutions are observed simultaneously in a colorimeter, and quantitated on the basis of the absorption of light.

col·or·im·e·try

(kŏl'ŏr-im'ĕ-trē) A procedure for quantitative chemical analysis, based on comparison of the color developed in a solution of the test material with that in a standard solution; the two solutions are observed simultaneously in a colorimeter, and quantitated on the basis of the absorption of light.
Synonym(s): colourimetry.

colorimetry

The measurement of colour in terms of hue, saturation and brightness or other standard (spectral purity, spectral energy, etc.). See Munsell colour system.

colorimetry

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Colorimetry

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Synonyms for colorimetry

noun quantitative chemical analysis by color using a colorimeter

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