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9
All Components Resolved for BTEX isomers
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
TheRtx
®
-Wax column offers the same selectivity as otherCarbowax
®
columns
for isomers of substitutedaromatics. This isuseful forBTEXanalyses requir-
ing thequantitationof the individual xylene isomers.
Figure8
illustrates that
all components in theBTEXanalysisare resolved.Themeta-,para-, andortho-
xylene are baseline resolved in just 17minutes.
2
6
43
1
Figure 8
Rtx
®
-Wax ColumnEfficientlyBaseline Resolves All Isomers inBTEXAnalysis
30m, 0.53mm ID, 1.0µmRtx
®
-WAX (cat.#12455)
0.25µl direct injection of aBTEX sample.
on-column concentration:
50ppm;
Oven temp.:
35°C to 75°C@2°C/min. (hold5min.);
Inj. & det. temp.:
200°C;
Carrier gas:
helium;
Linear velocity:
26cm/sec. set @ 35°C;
FID sensitivity:
8 x 10
-11
AFS
min. 5
10
15
5
1. benzene
2. toluene
3. ethylbenzene
4. p-xylene
5. m-xylene
6. o-xylene
FAMEWAX
™
Columns for FAMEAnalysis
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· Fast, efficient analyses.
· Thermally stable to 250°C.
· Meets AOCS andAOACmethod requirements.
TheFAMEWAX
™
columnprovides superb stationaryphase consistency, excel-
lent column efficiency, and thermal stability to 250°C. The elution order of
complex polyunsaturated fatty acid methyl esters (FAMEs) is comparable to
that on other Carbowax
®
columns, but baseline resolution is achieved in sig-
nificantly less time.
Capillary column performance requirements for PUFA analysis are specified
inAmericanOilChemistsSociety (AOCS) andAssociationofOfficial Analytical
Chemists (AOAC) methods. The AOCSMethod CE 1b-89
FAMEs analysis by
Capillary GLC
requires baseline resolution of C21:5n3 and C23:0 (internal
standard [IS]), and C24:0 and C22:6n3 (DHA). The AOAC Official Method
#991.39
Fatty Acids in Encapsulated FishOils and FishOil Methyl and Ethyl
Esters
requires the same elution pattern as Carbowax
®
20M and the addi-
tional resolution of C23:0(IS) fromC22:4n6.
visit Restek on-line
○ ○ ○ ○
or call
800-356-1688
ext.4
for technical
assistance.
