flame photometric detector

in gas chromatography
https://doi.org/10.1351/goldbook.F02411
The @[email protected] from the column is fed into a hydrogen-rich flame and produces light emission. Optical filters are used to select the @[email protected] range of the emission which is characteristic of specific atoms (usually sulfur or phosphorus). The detector is very specific, depending on the choice of optical filters. It can detect the S- and P-containing compounds down to \(10^{-3}\ \text{ppmv}\), but the detector is non-linear.
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2191 [Terms] [Paper]