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Chemical/Petrochemical
MXT®-Biodiesel TG Columns (Siltek® treated stainless steel)
**Connected with low-dead-volume Alumaseal™ connector.
Description
temp. limits
cat.#
price
14m, 0.53mm ID, 0.16 w/2m Integra-Gap™
-60 to 380/430°C 70289
10m, 0.32mm ID, 0.10
-60 to 380/430°C 70292
10m, 0.32mm ID, 0.10 w/2m x 0.53mm retention gap** -60 to 380/430°C 70290
15m, 0.32mm ID, 0.10
-60 to 380/430°C 70293
15m, 0.32mm ID, 0.10 w/2m x 0.53mm retention gap** -60 to 380/430°C 70291
Rtx®-Biodiesel TG Columns (fused silica)
**Connected with low-dead-volume Alumaseal™ connector.
Description
temp. limits
cat.#
price
10m, 0.32mm ID, 0.10
to 330/380°C 10292
10m, 0.32mm ID, 0.10 w/2m x 0.53mm retention gap** to 330/380°C 10291
15m, 0.32mm ID, 0.10
to 330/380°C 10294
15m, 0.32mm ID, 0.10 w/2m x 0.53mm retention gap** to 330/380°C 10293
10 x 0.32mm ID and 15m x 0.32mm ID, both of
which are factory coupled to a 2m x 0.53mm
retention gap using an Alumaseal™ connector.
Excellent resolution of all glycerides is achieved, as
shown in Figure 2.
Restek has also developed an innovative column
where the analytical column includes a built-in
retention gap in a continuous section of tubing,
requiring no connectors. This column, the MXT®-
Biodiesel TG column, is 14m x 0.53mm ID, and
features a 2m x 0.53mm ID Integra-Gap™ inte-
grated retention gap (Figure 3). This product elim-
inates any need for connections because the column
and retention gap are one piece of continuous tub-
ing. Target analytes resolve exceptionally well and
the solvent and triglyceride peaks show excellent
symmetry (Figure 4). Peak shape for butanetriol is
very good, demonstrating inertness, and the resolu-
tion and response of the glycerides is also excellent.
Conclusion
There are several column options available for
analyzing total glycerin in biodiesel fuels. The best
chromatographic solution for this analysis is the
14m x 0.53mm ID MXT®-Biodiesel TG column
with the 2m x 0.53mm ID Integra-Gap™ integrated
retention gap. This column eliminates the column
connection and can be used to 430°C allowing for
faster analysis times and higher sample throughput.
Figure 3
The Ultimate Biodiesel Solution:
MXT®-Biodiesel TG column with Integra-
Gap™ integrated retention gap.
The 0.53mm MXT
®
-Biodiesel TG columns are an innovative
alternative to using a 0.32mm column coupled to a 0.53mm
retention gap. Restek applied the Integra-Gap
™
integrated
retention gap technology to the 0.53mm MXT
®
-Biodiesel TG
columns, eliminating the column coupling. These 100%
leak-proof columns feature a built-in retention gap, reduc-
ing the risk of peak broadening and tailing, and guarantee-
ing the user many analyses without downtime.
Figure 4
Excellent chromatographic quality and resolution on the
0.53mm MXT®-Biodiesel TG column, with the Integra-Gap™ inte-
grated retention gap.
0
10
20
Time (min)
Column:
MXT
®
-Biodiesel TG, 14m, 0.53mm ID, 0.16µm (cat.# 70289) with
a 2m x 0.53mm Integra-Gap™ retention gap
(16m total length)
Sample:
biodiesel (B100), derivatized
Inj.:
cool on-column injection
1µL in heptane
Inj. temp.:
oven track
Carrier gas:
hydrogen, constant flow
Flow rate:
4mL/min.
Oven temp.:
50°C (hold 1 min.) to 180°C @ 15°C/min. to 230°C @ 7°C/min. to
380°C @ 30°C/min. (hold 5 min.)
Det.:
FID @ 380°C
GC_PC00969
Glycerin
Monoglycerides
Monoglycerides
Diglycerides
Triglycerides
butanetriol (IS)
tricaprin (IS)
The best solution
for analyzing
total glycerin in
biodiesel!