UV-Visible Spectrophotometer is an instrument

by:Getian     2020-07-19

Although most spectrophotometers used in the UV and visible regions of the spectrum, there are also instruments that operate near-infrared region.

Major parts of the spectrophotometer are a light source, the sample holder and diffraction grating or monochromator (used to separate wavelengths of light) and detectors. The radiation source is usually a deuterium lamp, which provides continuous ultraviolet light through the area. More recently, light emitting diodes (LED) and xenon headlights have to come to the use of visible wavelength. Detector is a simple or a photodiode or CCD. Photodiodes are used as UV-visible spectrophotometer, which uses a monochromator, and the diffraction grating is used with the CCD, which collects light of different wavelengths on different pixels.

UV-Visible spectrophotometers are generally used for the quantitative determination of solutions of transition metal ions and highly conjugated organic compounds. Since the electrons through the metal atoms can be excited from one electronic state to another, these decisions may be colored, the color does not affect the certain presence of anions or ligands. Which color of a solution of copper sulphate, for example, are light blue. Adding ammonia intensifies the color and change the maximum absorption wavelength of the solution.

Organic compounds, as well as absorb light in the UV and visible regions of the electromagnetic spectrum. Those with a UV-visible spectrophotometric determinations solvents are water-soluble compounds in water or ethanol-soluble organic compounds. Organic solvents can have high UV absorption, but that does not mean that these solvents are generally suitable for use in any application to include UV-visible spectrophotometers, given that ethanol is a very poorly digested most waves.

Solvent polarity and pH may also affect the absorption spectrum of organic compounds effects. Beer-Lambert law states that absorbance is directly proportional to the absorbing solution of species concentration and length. Therefore, for a fixed path length, UV-visible spectrometer for determining the concentration of absorption solution. It is necessary to know how quickly the change in absorbance with concentration. This information can be obtained from the molar extinction coefficients of the tables or the calibration curve.

UV-visible spectrophotometers can be used as a high-performance liquid chromatography (HPLC) detector. The presence of an analyte gives a response that can be considered proportional to the concentration. Visible spectrophotometry is widely used in regional science colorimeter. Paint manufacturers, printing, textile suppliers, and many other companies need to provide UV-visible spectrometer data. These data can be used to test a new batch of colorant to determine whether it meets the specifications, such as the ISO print standards.

Traditional UV-Visible spectrophotometers can not detect if the color or fluorescence of the base material. In view of the paint, it can be difficult to manage color issues, but if you happen to be printing inks, fluorescent - fluorescent pigment when light, bi-spectral fluorescent spectrophotometer may be used instead.

Custom message
Chat Online
Chat Online
Chat Online inputting...