r. For extract purification, the
chromatographic column (20 cm, 10 mm) was purified from bottom
to top by solid-phase extraction. Then it was eluted with
100 mL N-hexane and dichloromethane (7:3, V/V). The eluent
was collected and concentrated to a constant volume of 0.5 mL
by dilution in N-hexane. PCB103 (2,20
,4,50
,6-pentachlorobiphenyl)
was added as the internal standard for GC–MS analysis.
r. For extract purification, thechromatographic column (20 cm, 10 mm) was purified from bottomto top by solid-phase extraction. Then it was eluted with100 mL N-hexane and dichloromethane (7:3, V/V). The eluentwas collected and concentrated to a constant volume of 0.5 mLby dilution in N-hexane. PCB103 (2,20,4,50,6-pentachlorobiphenyl)was added as the internal standard for GC–MS analysis.
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