Lamps for UV-Vis spectroscopy

Lamps for UV-Vis spectroscopy

UV-Vis spectroscopy is a method to measure the absorption of visible light (390 nm to 800 nm) and UV light (190 nm to 390 nm). The substances are measured in solution contained in a quartz cuvette.
Using a spectrometer, light with a wavelength range of 190 nm to 800 nm is radiated through the cuvette and absorption spectrums are recorded. Different broadband UV-Vis light sources can be used.
Mercury lamps that emit just a single line spectrum are also used for the wavelength calibration or detecting mercury.

Typical environmental applications

 Mobile analytical measurement

  • Exhaust gas monitoring
  • Water analysis
  • NOx measurement

Environmental monitoring ensures that hazardous chemicals are correctly controlled and their use complies with statutory safety regulations. Detection methods exist, e.g. for NO, NO2, H2S, NH3 and other exhaust gas constituents.
In drinking water analysis, nitrate concentrations are determined by means of self-absorption, for example. The nitrate ion is detected bichromatically at two wavelengths. The difference of the extinctions measured at these two wavelengths is a measure of the nitrate concentration. It can be evaluated using a standard concentration.

Typical industrial applications

  • Monitoring of sulphur
  • Exhaust gas monitoring

Sulphur contained in automotive petroleum products attacks the catalytic converters in vehicle exhausts, leading to increased air pollution, toxic fumes and acid rain.
Detection methods, e.g. for NO, NO2, H2S, NH3 and other constituents of exhaust gases, are used for industrial process monitoring.

Typical medical applications

  • Dermatological examinations
  • Blood analysis / urine analysis

Thanks to modern techniques, medical skin examinations can be carried out quickly and conveniently for the patient. Spectroscopy reliably measures the dermal layers to enable the provision of a skin picture, without invasive intervention.