Which statement is true for flame ionization detectors (FID)? a. FID employs a beta emitter to ionize the sample.
b. The detector responds by combusting hydrogen gas from the mobile phase.
c. Emmision spectra are used to quantify the peak concentration
d. The FID flame gets cooler in the presence of hydrocarbon eluent.
e. FID relies on the combustion of the sample carbon atoms which produce CH radicals, CHO+ions, and electrons which are then detected.