FID response factors for 59 organic compounds were determined on GC using a WCOT column and cool on-column Injection. Observed responses gave average response factors characteristic of each compound class. On the basis of multiple determinations, the mean response factor of 15 alkanes was determined to be 14.53 area counts/ng with a relative standard deviation of 1.4% and that of 22 polycyclic aromatic hydrocarbon standards was 13.47 area counts/ng with a relative standard deviation of 5.7%. Limited studies on oxy-PAH and nltro-PAH Indicate that these compounds also exhibit characteristic FID response factors. These experimental results facilitate the quantitative analysis of multicomponents In a complex organic mixture by reducing demand on the number of standard compounds.