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  2. Ultraviolet–visible spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet–visible...

    A UV-Vis spectrophotometer is an analytical instrument that measures the amount of ultraviolet (UV) and visible light that is absorbed by a sample. It is a widely used technique in chemistry, biochemistry, and other fields, to identify and quantify compounds in a variety of samples.

  3. Spectrophotometry - Wikipedia

    en.wikipedia.org/wiki/Spectrophotometry

    UV-Vis spectrophotometer: Measures light absorption in UV and visible ranges (200-800 nm). Used for quantification of many inorganic and organic compounds. Used for quantification of many inorganic and organic compounds.

  4. Photometric system - Wikipedia

    en.wikipedia.org/wiki/Photometric_system

    In astronomy, a photometric system is a set of well-defined passbands (or optical filters), with a known sensitivity to incident radiation.The sensitivity usually depends on the optical system, detectors and filters used.

  5. Holmium(III) oxide - Wikipedia

    en.wikipedia.org/wiki/Holmium(III)_oxide

    They are therefore used as a calibration standard for optical spectrophotometers [12] [13] and are available commercially. [14] As most other oxides of rare-earth elements, holmium oxide is used as a specialty catalyst, phosphor and a laser material. Holmium laser operates at wavelength of about 2.08 micrometres, either in pulsed or continuous ...

  6. Spectronic 20 - Wikipedia

    en.wikipedia.org/wiki/Spectronic_20

    In this calibration, the transmittance is set at 100% using the calibration knob of the instrument (the amplifier control knob in the figure at right). The instrument can also optionally be calibrated with a stock solution of a sample at a concentration known to have an absorbance of 2 or else vendor supplied standards, using the light ...

  7. Calibration curve - Wikipedia

    en.wikipedia.org/wiki/Calibration_curve

    A calibration curve plot showing limit of detection (LOD), limit of quantification (LOQ), dynamic range, and limit of linearity (LOL).. In analytical chemistry, a calibration curve, also known as a standard curve, is a general method for determining the concentration of a substance in an unknown sample by comparing the unknown to a set of standard samples of known concentration. [1]

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