Page 24 - Basic Gas Chromatography

shorter
50-m
use
theoretical,
column
oven).
fused
continuous
due
to
li
found
competition
wide
predicted,
1300-m
nine
GC
and
much
since
found
commercial
connecting
longest
million
of
world—and
a
sample.
While
100%
than
made
has
a
to
the
smaller
1.3
it
nearly
led
[12].
who
analysis,
gasoline
by
for
a
of
has
inside
made
length
the
number
[11]
record
was
was
conditions.
this
in
International
a
quantitative
fit
efficiency
was
which
Disadvantages
in
column
total
length,
the
would
plate
components
column
Currently,
m
million
operational
that
450
‘“‘best”
column
a
its
have
for
Chrompack
column,
efficient
of
size
1.2
excellent
and
one
count—the
970
column.
to
largest
of
with
Advantages
the
number
calculated
separating
single
Chrompack
more
increases
in
(the
by
is
longest
limits
GC
a
held
a
plate
plate
into
column
Recently,
Because
was
of
Overview:
to
is
efficiency
the
columns
the
greatest
a
capable
column
part
it
had
make
silica
than
and
in
It
20 many for detectors quantitative Sensitive, applications. different provide pesticide A cost. low relatively at a and analyses, accurate fast, separation and sensitivity, speed, high the illustrating in shown is GC of selectivity 1.7. Figure has GC for method preferred the as distillation replaced separating temperature techniques, bo

Introduction & a fast a (b) Detection.
ISQOCTANE a a MINUTES separation Thermedics of
in a SECONDS conventional permission
PPM g a (a) with
1000 “ separations; Reprinted
OIL, “eo ID, oil
ORANGE mm 0.25 thickness C sec 25 sec 50 sec 60 at sec 80 at orange of instrument.
Standard reported not nts: Butyrate acetate (alpha)-pinene (alpha)-terpineol Perillaldehyde (alpha)-ionone meters, 6 DB-S5, film pm 60° temp. at C 65° to to 80°C at 100°C to 225° C to Hydrogen mL/min. 100 cm/sec. FID Comparison Flash-GC a on
Industry Conditions Ethyl Isomyl 4-terpineol Decanal Neral Carvone Geranail Undecanal Dodecanal Cadinene Int. Flash-2D-GC 0.25 initial ramp ramp ramp ramp 4 50:1 1.6. separation
10 Com - 1 2 - - 3 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 Column: Temp: Carrier: Flow: Velosity: Split: Detector: Fig.
(a) (6)