To ensure the separation of sample components in gas chromatograph analysis, the temperature setting of the detector must be considered. Too high a temperature setting will increase the component's response and baseline noise, reducing the sensitivity of the instrument; the temperature setting is too low, and the components will condense in the detector, not peaking or even contaminating the detector.
Gas chromatographs are often used to analyze samples with complex components and large differences in boiling points. The detector is the "eye" of gas chromatography.
To ensure the separation of the sample components, the temperature setting of the detector must be considered. Too high a temperature setting will increase the component's response and baseline noise, reducing the sensitivity of the instrument; the temperature setting is too low, and the components will condense in the detector, not peaking or even contaminating the detector.
In gas chromatograph analysis, the detector temperature setting has the following two principles:
1, to meet the requirements of detector sensitivity;
2. Ensure that the components that flow out of the column condense inside the detector.
The detector temperature setting is too high. For example, increasing the temperature of the FID will increase the response and noise, while increasing the temperature of the TCD and FPD will lower the sensitivity. Usually, the temperature is set at about 250 °C.
The operating temperature of the gas chromatograph ECD detector is generally higher, and the usual temperature range is 250~300 °C. Regardless of the low column temperature, the ECD temperature should not be lower than 250 °C. This is because the detector is difficult to balance when the temperature is low.
The temperature change of the thermionic source has a great influence on the sensitivity of the gas chromatograph NPD detector. The temperature is high and the sensitivity is high. Generally, the temperature is set at about 300 ° C. At this temperature, the sensitivity and stability of the detector are better.
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