The Reston Groundwater Dating Laboratory

Identification Of Halocarbons Present In Samples

ECD Detectors

The GC, column, pre-column, and cryogenic trap are optimized for the quantitative analysis of CFC-11, CFC-12, and CFC-113.

Other compounds that can be measured qualitatively during CFC analysis:

Identification of specific halocarbons should be confirmed by GC-mass spectroscopy since more than one compound can have the same or similar retention time. The retention time can vary as a result of changes in the oven temperature, the length of the analytical column, the carrier gas composition (N2, or Ar-CH4), and the carrier gas flow rate.