This application note discusses the uses of the FPD in gas chromatography, demonstrates the linearity and method detection limits (MDL) of the 6890 Series GC with an FPD, and gives examples of analyses of organophosphorus pesticides using the 6890 GC with an FPD.
The document describes the operation of a Flame Photometric Detector (FPD) used with the Agilent 6890 Series Gas Chromatograph (GC). It explains that the FPD is a selective detector commonly used to detect sulfur and phosphorus compounds in complex mixtures by filtering characteristic light emitted from chemiluminescent species in a reducing flame. The note details the specific wavelengths used for detection: 394 nm for sulfur and 526 nm for phosphorus.
The application note presents experimental results demonstrating the linearity and method detection limits (MDL) of the 6890 Series GC equipped with an FPD. It includes data for sulfur analysis and the analysis of organophosphorus pesticides according to EPA methods 1618 and 622. The document also outlines the operating conditions, such as detector temperature limits and gas flow requirements, for these analyses.
| Maximum detector temperature | 250 °C |
|---|---|
| Minimum operating temperature | 120 °C |
| Sulfur detection wavelength | 394 nm |
| Phosphorus detection wavelength | 526 nm |
The maximum temperature limit for the 6890 FPD is 250 °C to protect the photomultiplier.
A 394-nm filter is used for sulfur detection.
A 526-nm filter is used for phosphorus detection.