Direct Sample Introduction and GC Interface

Basically, gas chromatography separates chemicals in vapor based on each chemical s distinct distribution coefficient between the stationary and mobile phases. A column containing the stationary phase is the heart of the technique, and the carrier gas (mobile phase) is used to carry the chemicals through the column. (A complete discussion of gas chromatography is beyond the scope of this book. Numerous excellent publications on gas chromatography are available, and we have included three references in the bibliography at the end of the book.) 

For the FPD, a GC column can be used to separate chemicals in the sample before they enter the mixing and combustion chamber according to their respective elution time. The combination of retention times determined by GC and the presence of sulfur and/or phosphorous signals enables the possible identification of targeted 

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