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FPD - SRI Instruments
FPD - Flame Photometric Detector
54-55
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Bandpass filter for sulfur or phosphorus (1 filter installed)
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Use the dual FPD for simultaneous sulfur and phosphorus detection
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Detects sulfur compounds to 200 ppb, phosphorus compounds down to 10
ppb
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Use the FPD/FID or Dual FPD/FID for simultaneous hydrocarbon speciation
The Flame Photometric Detector can detect sulfur compounds, such as H
2
S or SO
2
, down to about 200
ppb and phosphorus compounds to 10 ppb. While not 100% selective, the FPD is 100,000 times more
sensitive to sulfur and phosphorus compounds than hydrocarbons. The phosphorus response is linear, and
the sulfur response is exponential (twice the sulfur yields four times the peak area).
The chromatogram to the left
shows the FPD sulfur
response to 10 ppm H
2
S.
This chromatogram
shows the FPD
phosphorus response to
10 ppm malathion.
The FPD is similar in design to the
, except that the detector body is light-tight and a second flow of hydrogen purges
the optical path between the photomultiplier tube (PMT) and the hydrogen-rich flame. A bandpass filter (at 393 nm for
sulfur and 525 nm for phosphorus) mounts in front of the PMT, so only that the emissions from sulfur or phosphorus
are detected while other wavelengths are rejected.
The dual FPD detector is equipped with two PMTs and filters for the simultaneous detection of sulfur and phosphorus.