Table4.
Dioxin-like PCB concentrations in Aroclor 1254 (pg/µL) as calculated from the study of
Frame et. al, andwithGCxGC-ECD. The Aroclor was spikedwith anOCP standard tomake the
determinationmore challenging and demonstrate the selectivity of GCxGC.
PCB#
Frame et. al
GCxGC-ECD
77
0.95
**
81
ND
ND
105
94.2
96.4
114
5.67
6.54
118
232
193
123
4.73
4.90
126
ND
ND
156
25.8
33.1
157
5.99
6.74
167
8.51
10.5
169
ND
ND
189
0.32
0.85
ND= not detected. **possible coelution from PCB 110.
Conclusions
GCxGC-ECDwith a selective column in the second dimension offers away to substantially improve
separations for the important group of dioxin-like PCBs, even in the presence of PCBs that are
normally at higher concentrations in environmental samples. Due to the increase in peak capacity
affordedwith GCxGC, organochlorine pesticides did not interferewith dioxin-like PCB
determinations either.
Reference
G.M. Frame, J.W. Cochran and S.S. Bowadt,
CompletePCBCongener Distributions for
17AroclorMixturesDeterminedby3HRGCSystemsOptimized for Comprehensive,
Quantitative, Congener-Specific Analysis,
J. High Resol. Chromatogr.,
19 (1996) 657-668.
Acknowledgment
Frank Dorman at Restek Corporation provided the GC columns used for this work.
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