Gas Chromatograph Analyzer, EPC/EFC Control

Specifications of the hydrogen generator

Q1: What is a gas chromatograph?
A1: Gas chromatograph is an instrument used for analyzing volatile compound mixtures, which can separate different components in a sample and perform qualitative and quantitative analysis. Widely used in fields such as environmental monitoring, food safety, petrochemicals, medicine and health.

Q2: How does a gas chromatograph work?
A2: Gas chromatography achieves component analysis by gasifying the sample and injecting it into a carrier gas stream, separating it through a chromatographic column, and then detecting the signals of each component with a detector. Common detectors include hydrogen flame ionization detector (FID), thermal conductivity detector (TCD), electron capture detector (ECD), etc.

Q3: What are the common types of detectors in gas chromatographs?
A3: Gas chromatographs (GC) can be classified according to different standards, mainly based on their working principles, detector types, injection methods, and other aspects.

• FID (Hydrogen Flame Ionization Detector): High sensitivity, suitable for organic compounds.
• TCD (Thermal Conductivity Detector): Highly versatile and suitable for both organic and inorganic gases.
• ECD (Electron Capture Detector): Suitable for detecting halogen compounds, such as pesticides.
• FPD (flame photometric detector): used for sulfur-containing and phosphorus containing compounds.
• MS (Mass Spectrometry Detector): can provide molecular structure information, with higher sensitivity and selectivity.

Tips: How to ensure the normal operation of gas chromatography and the accuracy of experimental results?

1. Preparation before operation
   Instrument inspection: Ensure that the instrument is in good condition, check if the gas supply is sufficient, if the flow rate is stable, and set appropriate column temperature, injection port, and detector temperature. Sample preparation: Select the appropriate injector and injection method based on the properties of the sample to ensure accuracy and reproducibility of the sample.
2. Sample injection system
   Sample injector selection: Use a microsyringe for liquid samples, a six way valve for gas samples, and dissolve solid samples before sampling. Gasification chamber: Ensure that the gasification chamber is clean, has no catalytic effect, and has a large heat capacity to ensure instantaneous gasification of the sample.
   separation system. Column selection: Choose the appropriate column type (packed column or capillary column) and stationary phase 34 according to the analysis requirements.
   Temperature control: For complex samples, use programmed heating to improve separation efficiency.
   detection system. Detector selection: Choose the appropriate detector type (concentration type or mass type) based on the analysis object. Detector maintenance: Regularly clean the detector to ensure its sensitivity and accuracy.
3. Temperature controller
   Temperature setting: Set an appropriate temperature based on the properties of the sample and analysis requirements to ensure that the sample vaporizes instantly in the gasification chamber and is effectively separated in the chromatographic column recording system. Data recording: Use an automatic balancing electronic potentiometer or a chromatograph equipped with an integrator to record data, ensuring accuracy and reliability of the data.
4. Routine maintenance
   Instrument cleaning: Regularly clean the chromatography column, injection port, and detector to prevent contamination and blockage. Gas supply: Ensure the purity of the carrier gas and regularly replace the purification and drying tubes. Column maintenance: Clean the oxygen in the system before aging, and reduce the column temperature to below 50 ℃ before shutting down to prevent oxidation and degradation of the fixative.

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