FID vs TCD: how do you choose?

Direct answer

FID responds well to many organic compounds, whereas TCD is a broader concentration detector that can cover gases with different sensitivity. Selection depends on analytes, concentration, carrier gas and the method.

Selection checklist

• Define the sample matrix and target analytes.
• Confirm the applicable official or validated method.
• Match sample preparation, separation and detector response.
• Verify blanks, calibration, carryover and performance with the real sample.

Technical boundary

This page is selection guidance. It does not replace a standard method, instrument manual or laboratory validation.