Flame photometric detector

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The flame photometric detector ( FPD ) is a detector for phosphorus and sulfur compounds , which is mainly used in connection with gas chromatographs (GC) or as a fire detector .

Measuring principle

The FPD uses the light of certain wavelengths released during the combustion of phosphorus and sulfur compounds . The combustion of the substance takes place in an oxyhydrogen flame , as with the flame ionization detector . The sulfur and phosphorus atoms excited in this way emit light with a characteristic wavelength (394 nm for sulfur and 526 nm for phosphorus).

Technical use

Fire alarm

The first flame photometric detector (FPD) was developed by DW Grant in the 1950s. The selective measurement takes place with an appropriate filter with the help of a photomultiplier . An FPD is very sensitive and works selectively. The principle is considered to be the best sulfur detector.

GC detector

The GC / FPD coupling was developed in the 1960s. When used as a GC detector, detection is also carried out by means of a photomultiplier with an upstream filter. The detection limits for phosphorus are approx. 10 pg, for sulfur they are> 100 pg. The detector has a non-linear response for sulfur.

With the FPD, halogenated hydrocarbons and organotin compounds can also be detected with appropriate filters . A further development of the FPD is the PFPD (Pulsed Flame Photometric Detector)

literature

  • Sam S. Brody, John E. Chaney: Flame photometric detector: the application of a specific detector for phosphorus and for sulfur compounds - sensitive to subnanogram quantities. In: Journal of Gas Chromatography. Vol. 4, No. 2, 1966, pp. 42-46, doi : 10.1093 / chromsci / 4.2.42 .

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