Jou rnal 01Chromalograph,c sceeee. Vol. 24. FeDruary 1966
sponse. Themixtureof20ml/rninH,. 100mllminair represents
an
oxygen-rich
flame, while the mixture of
3S
mllmin
H,. 70
ml/minair isa
hydrogen-rich
flame. Generally, stoichiometric
or oxygen-rich flames are the most useful for the
FTID.
Figure
12
shows multiple mode analyses of a commercial
brand of cologne. These sets of chromatograms illustrate the
advantageous useof the specific detectionmodes to enhance
responses for trace fragrance components in colognes. The
TID- I-N,mode isespeciallyuseful becauseit is
non-destructive.
Therefore, TID·I ·N, emitsexhaust gases that are characterized
bydislinctly different fragrances that change with time as the
various segments of the chromatogramelute. For the cologne
shown. as well as for other brands that
have been
examined.
the set of chromatograms obtained from the different modes
of thermionicdetection providea characteristic fingerprint that
distinguishes one brand from another.
All
the modes of detection described in this
ar ticle
measure
negative ionizat ion current s. Themagnitudesof thesecurrents
are very dependent
on
the electronegative character of the
chemical species adjacent
10
the heated thermionic source.
NITRO
ADDITIVEr-} I N DI ESel
FUel
(fl O
6.4 X
10- 9
•
T I 0-I-N 2
32 X
10. 11
TI D-2 - H
2
/ AIR
512 X 10- 11
CHANEl 1>10 . 5
•
Cf l O
3J
• 10. 9
,
3
•
,
•
•
TIO- \-N 2
3
128. 10. 10
•
I
:
r
'.'
•
,
Tlo-I - A l it.
'"
•
10-
11
•
7
,
TIO-I -AIR
fT lD-l
",
,.
•
6.4 X 10. 12
A I. I • •
•
fT
I 0 - 1
,
I 2 8 • 10. 11
",
as
FTI 0-1
• 7
AI.
7.
a
J
••
X
10 - 12
Figure
11.
ChromatogramsshOWingdifferentdetector
responses
toa sample
01
diesel
tueI
COOlalOOlg
atrace nttro-comPOufl!l aaditrve
ldenh~ed
by
me
astensx
Column
SP·21llO.
90°to 270"(; at10 o/mln.
Figure
\2.
Chromatograms stlowing multiple modes
of
detector responseto
aDrand
0'
cologne ranoomly otltalned. Column:
SP-2100, HJOo
to
270"(;
at
16°/min
49
