Fid ppt(2)
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The document summarizes the flame ionization detector (FID). It operates by passing a sample gas through a hydrogen-air flame, which ionizes organic compounds. These ions produce a current that is proportional to the amount of organic compounds present. The FID is very sensitive to organic compounds, exhibiting high sensitivity down to 10-13g/s. It is commonly used for gas chromatography due to its low cost, low maintenance, rugged design, and wide linear detection range. However, it cannot detect inorganic compounds and destroys the sample during combustion.
Fid ppt(2)
- 1. Flame ionization detector (FID) Done by: Aya Ali Malak Al-Ghamdi Supervised by: Dr. Haya Al-Johar
- 2. Outline Introduction Operating principle of FID Description of FID Applications of FID Advantages of FID Disadvantages of FID Sensitivity of FID
- 3. Operating principle: Ionization detectors interact with solutes eluted from gas chromatography (GC) columns to produce a current that varies in proportion to the amount of solute present. FID is sensitive to molecules that are ionized in a hydrogen–air flame, including most carbon-containing compounds
- 6. The flame ionization detector passes sample and carrier gas from the column through a hydrogen-air flame. The hydrogen-air flame alone creates few ions, but when an organic compound is burned there is an increase in ions produced. A polarizing voltage attracts these ions to a collector located near the flame. The current produced is proportional to the amount of sample being burned. This current is sensed by an electrometer, converted to digital form, and sent to an output device.
- 7. Detector performance characteristics (sensitivity, minimum detectable quantity, linearity, and selectivity) FID is A mass flow sensitive detector that for organic compounds the intensity of the signal is proportional to the mass flow of carbon.
- 8. Applications FID responds only to substances that produce charged ions when burned in a hydrogen/air flame. does not respond to water, or permanent gases .
- 9. he FID responds only to substances that produce charged ions when burned in a hydrogen/air flame.
- 10. Cost: Inexpensive to acquire and operate. Low maintenance requirements: Apart from cleaning or replacing the FID jet, these detectors require no maintenance. Rugged construction: FIDs are relatively resistant to misuse. Linearity and detection ranges: FIDs can measure organic substance concentration at very low and very high levels, having a linear response of 10^6. Advantages
- 11. Disadvantages Flame ionization detectors cannot detect inorganic substances. FID flame oxidizes all compounds that pass through it. destroys sample. It requires additional Gases and controllers. For this reason, FIDs tend to be the last in a detector train and also cannot be used for preparatory work.
- 12. Sensitivity The FID exhibits a high sensitivity (10-13g/s),large linear.
- 13. Thank you