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and Rtx®-CLPesticides2 column set, was originally developed for the
organochlorine pesticides in EPA Method 8081. While popular among
analysts for this method, the unique selectivity is also appropriate
for many other common halogenated compounds, making them an
excellent choice for many GC-ECD methods.
Optimal Performance for 7 ECD Methods
A key benefit of this column pair is that, since it works quite well for
several common ECD methods, there is no need to dedicate one
instrument strictly to an individual method or to change columns
based on testing needs. In addition, compared to other column
sets that are offered specifically for GC-ECD methods, the Rtx®-
CLPesticides column set provides the best overall performance across
all 7 commonly used EPA methods (Table I). Comparisons of analysis
time and coelutions demonstrate that this column set is an ideal
choice for chlorinated pesticides, PCBs, herbicides, haloacetic acids,
and other halogenated compounds.
Cut Analysis Time in Half for Method 8081
The selectivity of the Rtx®-CLPesticides column set was originally
tuned for the analysis of organochlorine pesticides by EPA Method
8081. This is one of the most common ECD methods used by envi-
ronmental labs, and it provides an excellent example of the perfor-
mance of the column pair. As shown in Figure 1, all compounds are
fully resolved in just 7 minutes using standard 0.32 mm columns for
analysis. This time savings translates to significantly higher sample
throughput (Table II), which is an important consideration for most
labs.
Summary
Instead of dedicating instruments to a single method or changing
columns between methods, analysis of chlorinated pesticides, PCBs,
herbicides, and other halogenated compounds can be done on a
single column set. Rtx®-CLPesticides and Rtx®-CLPesticides2 columns
outperform other column sets offered specifically for multiple GC-ECD
methods and are recommended for labs interested in increasing
operational efficiency.
For complete comparisons and chromatograms for all methods, visit
Visit for standards,
sample prep supplies, and other
column dimensions.
Rtx®-CLPesticides Column (fused silica)
(proprietary Crossbond® phases)
Description temp. limits cat.#
30m, 0.32mm ID, 0.32µm -60 to 320/340°C 11141
Rtx®-CLPesticides2 Column (fused silica)
(proprietary Crossbond® phases)
Description temp. limits cat.#
30m, 0.32mm ID, 0.25µm -60 to 320/340°C 11324
Table II: Sample throughput can be significantly improved by using
Rtx®-CLPesticides and Rtx®-CLPesticides2 columns.
*Comparison based on published competitor data. Assuming a 5 minute cool-down and equili-
bration time and a 5 minute high temperature hold after the last compound elutes, samples run
per 12 hour sequence are calculated as follows:
Restek: 5 min. + 5 min. + 7 min. = 17 min./sample; 720 min./17 min. = 42 samples
Agilent: 5 min. + 5 min. + 16 min. = 26 min./sample; 720 min./26 min. = 27 samples
Phenomonex: 5 min. + 5 min. + 10 min. = 20 min./sample; 720 min./20 min. = 36 samples
Vendor Column Pair Analysis Time Coelutions Runs/12 hr Shift*
Restek Rtx-CLPesticides
Rtx-CLPesticides2
7
7
0
0
42
Agilent DB-35ms
DB-XLB
15
16
0
0
27
Phenomenex ZB-MR1
ZB-MR2
10
9
0
0
36
GC_EV00933
Columns: Rtx®-CLPesticides 30 m, 0.32 mm ID, 0.32 µm (cat.# 11141) and Rtx®-CLPesticides2 30 m, 0.32
mm ID, 0.25 µm (cat.# 11324) using Rxi® Guard Column 5 m, 0.32 mm ID (cat.# 10039) with Deactivated
Universal “Y” Press-Tight Connector (cat.# 20405-261); Sample: Organochlorine Pesticide Mix AB #2
(cat.# 32292), Pesticide Surrogate Mix, EPA 8080, 8081 (cat.# 32000); Injection: Inj. Vol.: 1 µL splitless
(hold0.3min.),Liner:GooseneckSplitless(4mm)(cat.#20799), Inj.Temp.:250 °C;Oven:OvenTemp:120
°Cto 200 °C at 45 °C/min. to 230 °C at 15 °C/min. to 330 °C at 30 °C/min. (hold 2 min.);Carrier Gas : He;
Detector: μ-ECD@ 330 °C;Notes: Instrument was operated in constant flow mode., Linear velocity: 60
cm/sec. @ 120 °C.
1. 2,4,5,6-Tetrachloro-m-xylene(SS)
2. α-BHC
3. γ-BHC
4. β-BHC
5. δ-BHC
6. Heptachlor
7. Aldrin
8. Heptachlor epoxide (isomer B)
9. trans-chlordane
10. cis-chlordane
11. Endosulfan I
12. 4,4´-DDE
13. Dieldrin
14. Endrin
15. 4,4´-DDD
16. Endosulfan II
17. 4,4´-DDT
18. Endrin aldehyde
19. Endosulfan sulfate
20. Methoxychlor
21. Endrin ketone
22. Decachlorobiphenyl (SS)
Figure 1: Rtx®-CLPesticides columns provide a fast, 7 minute
analysis time with no coelutions.
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