Detection limit for methylene chloride on GC-ECD

Chromatography Forum: GC Archives: Detection limit for methylene chloride on GC-ECD
Top of pagePrevious messageNext messageBottom of pageLink to this message  By Martin Elsner on Monday, April 2, 2001 - 08:13 am:

Based on the signal to noise ratio, the detection limit for methylene chloride was determined as 7.5 pmol or 700 pg total injected substance (Carlo Erba GC with ECD 400/Ni-63 source) Is this normal or are lower detection limits possible?


Top of pagePrevious messageNext messageBottom of pageLink to this message  By Mike on Tuesday, April 3, 2001 - 01:11 am:

My limit with Hewlett-Packard Ni-63 ECD was about 50 pg at the detector (specific response of methylene chloride relative to carbon tetrachloride was 0.006). Your message says "total injected" so I am not sure if that is comparable. Strictly speaking to compare detectors, sensitivity should be in pg/second. On my system that was about 10 pg/second.


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