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.

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