State which chromatographic technique you would use for the
following analyses, and briefly justify your choices:
a) to determine the concentration of
benzene, toluene and xylene present in a petroleum sample
b) to determine the composition of
volatile species in a fragrance sample
c) to determine the presence of drugs
in a blood sample
d) to determine the molecular weight of
a polymer
e) to determine the concentration of
sodium ions in a water sample