Cleaning the sample cone and gas cone 5-25
•Formic acid.
• Ultrasonic bath.
• Source of oil-free, inert gas (nitrogen or helium) for drying (air-drying
optional).
• Wash-bottle containing HPLC-grade, or better, 1:1 methanol/water.
• Large beaker.
To clean the sample cone and gas cone
1. If the sample cone contains debris, place a drop of formic acid on its
orifice.
2. Immerse the sample cone and gas cone separately in glass vessels
containing 1:1 methanol/water.
Tip: If the components are obviously contaminated, use 45:45:10
methanol/water/formic acid.
3. Place the vessels in the ultrasonic bath for 30 minutes.
4. If you used formic acid in the cleaning solution, do as follows:
a. Rinse the components by immersing them separately in glass
vessels containing water and then placing the vessels in the
ultrasonic bath for 20 minutes.
b. Displace the water by immersing the components in separate glass
vessels containing methanol and then placing the vessels in the
ultrasonic bath for 10 minutes.
Warning: The sample cone and gas cone can be contaminated
with biohazardous and/or toxic materials. Always wear
chemical-resistant, powder-free gloves while performing this
procedure.
Warning: Use extreme care when working with formic acid. Work in a
fume hood, and use suitable protective equipment.
Caution: The sample cone is fragile. Never place it on its tip; always
place it on its flanged base.
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