What are the characteristics of gas chromatography?

What are the characteristics of gas chromatography?

Gas chromatography (GC) is a highly efficient separation and analytical technique, with its core characteristics summarized as follows:

‌High Sensitivity‌
Capable of detecting trace substances (e.g., at 10⁻¹³ g levels), suitable for ultra-trace impurity analysis (e.g., ultra-pure gases, polymer monomer impurities).

‌High Separation Efficiency‌

Can separate closely related isomers, isotopes, and complex mixtures.

Capillary columns achieve theoretical plate counts in the millions, ensuring exceptional separation efficiency.

‌Rapid Analysis‌
Single analyses typically take only minutes to tens of minutes, ideal for rapid testing and production control.

‌Wide Application Range‌

Suitable for volatile and thermally stable compounds (e.g., organics, gases).

Extendable to some non-volatile substances through derivatization or pyrolysis techniques.

‌High Selectivity‌
Optimizing stationary phases (e.g., polysiloxanes) and detectors (e.g., FID, MS) enables targeted analysis of specific components.

‌Minimal Sample Volume‌

Gas samples require only milliliters.

Liquid samples need microliter quantities.

‌Advantages in Hybrid Techniques‌

Coupling with mass spectrometry (GC-MS) significantly enhances qualitative capabilities.

Detectors (e.g., FID, TCD) offer high sensitivity and broad linear response ranges.

‌Limitations‌

Only applicable to volatile or thermally stable compounds; non-volatile substances require pretreatment.

High temperatures may affect heat-sensitive components.

SH121 degassing vibration instrument

Applicable standard:GB/T17625 DL429.4 standard, used for oil dissolved gas component content determination method (gas chromatography) oscillation degassing;

Oscillating degassing of water-soluble acids in oil (colorimetric method) can also be used for constant temperature and timing oscillation in other physical and chemical experiments.