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7
Performance Verification
Check NCD Performance
114
1
Gather the following:
•
Evaluation column, HP-5 30 m × 0.32 mm × 0.25 μm (part
number 19091J-413)
•
NCD performance evaluation (checkout) sample
(5190-7002): 3-methylindole 10.0 ± 0.1 mg/L,
9-methylcarbazole 14.1 ± 0.1 mg/L, and nitrobenzene
9.51 ± 0.05 mg/L in isooctane.
•
Chromatographic-grade isooctane
•
4-mL solvent and waste bottles or equivalent for
autoinjector
•
2-mL sample vials or equivalent for sample
•
Inlet and injector hardware (See
Chromatographic Checkout"
2
Verify the following:
•
Chromatographic-grade gases plumbed and configured:
helium as carrier gas, oxygen as oxidizer and ozone supply
gas.
•
Ozone supply gas moisture trap and other traps are in
date.
•
Empty waste vials loaded in sample turret.
•
4-mL solvent vial with diffusion cap filled with isooctane
and inserted in Solvent A injector position.
•
4-mL solvent vial with diffusion cap filled with isooctane
and inserted in Solvent B injector position.
3
Replace consumable parts (liner, septum, traps, syringe, and
so forth) as needed for the checkout. See
Chromatographic Checkout"
4
Install the evaluation column. (See the procedure for in the
GC Maintaining Your GC manual.)
•
Bake out the evaluation column for at least 30 minutes at
270 °C. (See the procedure for in the GC Maintaining
Your GC manual.)
•
Configure the column.
5
Check the detector baseline output. The output should be
below 150 pA and relatively stable, assuming a
well-stabilized system with the column oven at 50 °C. (A
negative baseline can be acceptable.).
"Prepare for
on page 107.)
"Prepare for
on page 107.
SCD and NCD User Manual
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