Gas chromatograph hp 5890a series ii - powerful analytical instrument by hewlett-packard

The gas chromatograph HP 5890A Series II by Hewlett-Packard is a powerful analytical instrument used in various industries for the separation and analysis of complex mixtures. With its advanced features and reliable performance, this chromatograph has become a popular choice among researchers and scientists.

Content Index

What can be detected by GC FID?

The most common detector used in gas chromatography is the Flame Ionization Detector (FID). The FID is highly sensitive and capable of detecting compounds that contain carbon atoms, which includes almost all organic compounds. However, it is not sensitive to carbon atoms with a double bond to oxygen, such as carbonyl groups and carboxyl groups.

The FID is widely used for the analysis of organic compounds in various applications. It is particularly useful in industries such as pharmaceuticals, environmental analysis, and forensic science.

gas chromatograph hp 5890a series ii hewlett-packard - How does a gas chromatography detector work

What is the most common GC detector?

The most common GC detector is the Flame Ionization Detector (FID). It is a general-purpose detector that can analyze a wide range of organic compounds. The FID operates by creating a hydrogen flame that oxidizes the carbon in the sample, causing an ionization reaction. The ions formed are then detected and measured.

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Other types of detectors used in gas chromatography include the Thermal Conductivity Detector (TCD), Electron Capture Detector (ECD), Flame Thermionic Detector (FTD), Flame Photometric Detector (FPD), and Sulfur Chemiluminescence Detector (SCD). These detectors have selective capabilities and high sensitivity for specific types of compounds.

General-Purpose Detectors

Flame Ionization Detectors (FID)

The FID is the most common detector used in gas chromatography. It is sensitive to compounds that contain carbon atoms and can analyze almost all organic compounds. However, it is not sensitive to carbon atoms with a double bond to oxygen, such as carbonyl groups and carboxyl groups.

The FID operates by creating a hydrogen flame that oxidizes the carbon in the sample. The resulting ions are attracted to a collector electrode and detected. The FID is widely used in organic compound analysis in various industries.

Thermal Conductivity Detectors (TCD)

The TCD can detect all compounds other than the carrier gas. It is mainly used to detect inorganic gases and components that the FID is not sensitive to. The TCD operates by measuring the difference in thermal conductivity between the carrier gas and the target components.

Helium is commonly used as the carrier gas in TCD. The TCD is useful for the analysis of water, formaldehyde, formic acid, and other compounds that are not easily detected by the FID.

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gas chromatograph hp 5890a series ii hewlett-packard - What is the most common GC detector

Barrier Discharge Ionization Detectors (BID)

The BID is a proprietary detector by Shimadzu that can detect all inorganic and organic compounds other than helium and neon. It is capable of detecting trace amounts of impurities at the parts per million (ppm) level. The BID generates a stable helium plasma and uses the energy emitted to ionize compounds, which are then attracted to a collector electrode for detection.

The BID is commonly used for organic compound analysis and trace gas analysis in various industries.

Detector Gas and Makeup Gas

Each detector in the gas chromatograph requires specific gases based on its principle of detection. For example, the FID uses a hydrogen flame and requires hydrogen and air as the detector gas. In some cases, a makeup gas may be added just before the detector to ensure a rapid supply of compounds and reduce the effects of changing flow rates.

The table below shows the detector gas and makeup gas required for each detector:

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  • FID: Detector Gas - Hydrogen and Air, Makeup Gas (Capillary) - Helium or Nitrogen
  • TCD: Detector Gas - Unnecessary, Makeup Gas - Helium or Argon or Nitrogen or Hydrogen, etc.
  • BID: Detector Gas - Helium, Makeup Gas - None
  • ECD: Detector Gas - Mainly Nitrogen, Makeup Gas - Varies by equipment model
  • FTD: Detector Gas - Hydrogen and Air, Makeup Gas - Helium
  • FPD: Detector Gas - Hydrogen and Air, Makeup Gas - None (required in some models)
  • SCD: Detector Gas - Hydrogen and Oxygen, Makeup Gas - Nitrogen

How does a gas chromatography detector work?

A gas chromatography detector works by detecting and measuring the components separated by the chromatographic column. Each detector operates based on its specific principle of detection.

For example, the Flame Ionization Detector (FID) creates a hydrogen flame that oxidizes the carbon in the sample. The resulting ions are attracted to a collector electrode and detected. The FID is highly sensitive to organic compounds that contain carbon atoms.

On the other hand, the Thermal Conductivity Detector (TCD) measures the difference in thermal conductivity between the carrier gas and the target components. This detector is useful for the analysis of inorganic gases and compounds that are not easily detected by the FID.

Other detectors, such as the Barrier Discharge Ionization Detector (BID), generate a stable plasma and use the emitted energy to ionize compounds for detection. Each detector has its own unique operating principle and is suitable for specific types of compounds.

gas chromatograph hp 5890a series ii hewlett-packard - What can be detected by GC FID

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In conclusion, the gas chromatograph HP 5890A Series II by Hewlett-Packard is a versatile instrument with various detectors that can analyze a wide range of compounds. It offers reliable performance and accurate results, making it a valuable tool in analytical laboratories.

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