Resprep CarboPrep Plus SPE Cartridge (Lot Comparisons)

	Peaks
1.	2,4,5,6-Tetrachloro-m-xylene (TCMX)
2.	Decachlorobiphenyl (DCB)

Injection
Column	Rtx-CLPesticides, 30 m, 0.32 mm ID, 0.32 µm (cat.# 11141)
Standard/Sample	2,4,5,6-Tetrachloro-m-xylene (cat.# 32027)
	Decachlorobiphenyl (BZ #209) (cat.# 32029)



Diluent:	Hexane
Conc.:	2 ppb
Inj. Vol.:	4 µL splitless (hold 0.75 min)
Liner:	Topaz 4.0 mm ID single taper inlet liner w/wool (cat.# 23303)
Inj. Temp.:	250 °C
Purge Flow:	50 mL/min
Oven
Oven Temp.:	90 °C (hold 0.5 min) to 330 °C at 25 °C/min (hold 2 min)
Carrier Gas	He, constant flow
Flow Rate:	3.5 mL/min

Detector	Micro-ECD @ 340 °C
Make-up Gas Flow Rate:	50 mL/min
Make-up Gas Type:	N₂
Data Rate:	50 Hz
Instrument	Agilent/HP6890 GC
Sample Preparation	Conditioned a Resprep CarboPrep Plus SPE cartridge (cat.# 25845) by adding one cartridge volume of hexane:acetone (90:10) and letting it stand for five minutes before drawing the solvent down to frit level. Then, 1 mL of sample extract was loaded onto the cartridge and eluted with 9 mL of hexane:acetone (90:10).

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