1. Which statement is NOT true for flame ionization detectors?
A) The detector responds to hydrocarbon analytes, which are burned in a mixture of H2 and air
after eluting from the column.
B) During combustion the sample carbon atoms produce CH radicals, which are thought to
produce CHO+ ions and electrons in flames.
C) In the absence of analyte, a current of ~10?14 A flows between the flame tip and the
collector. Analytes produce a current of ~10?12 A.
D) Flame ionization detectors respond to non-hydrocarbon compounds, but to a lesser degree
than hydrocarbons. E) The detector responds proportionally to analyte mass over seven orders of
magnitude.
E) The detector responds proportionally to analyte mass over seven orders ofmagnitude.
Solution
Option (d)
Explanation - Flame ionization detectors responds to hydrocarbon analytes but does not responds
to non-hydrocarbon compounds.