CEM iPrep 12, Руководство пользователя, Страница: 12 / 30

8 New Liner and Plug Conditioning
New Liner and Plug Conditioning
All new liners and plugs should be conditioned as a set prior to being put into service. The break-in procedure is
used to condition the Teflon® to ensure a proper seal. CEM recommends conditioning the plugs and liners based
on the acid type that will be used: HNO
3
, HCl, H
2
SO
4
, H
3
PO
4
, HF. Aqua Regia, or H
2
O
2
.
Nitric Acid Liner and Plug Conditioning
1. Use hot soapy water and foam brush to clean the liners and plugs. Rinse thoroughly with DI water and allow to
dry completely before use.
NOTE
Micro 90 Cleaner® liquid detergent works well on Teflon. Avoid detergents that contain ingredients that
could cause potential contamination such as Na and P. Avoid abrasive cleansers and stiff brushes which
can scratch the Teflon surface.
2. Place 0.25 g ± 0.05 g of tea leaves or appropriate sample into each liner. Never add sample or liquid to liner
with sleeve in place.
WARNING
Proper precautions must be taken to avoid contact with reagents or reagent vapors. Protective gear should
be worn as outlined in the user’s safety program for hazardous materials and the reagent manufacturer’s
safety data sheet. Refer to these guidelines for proper handling and disposal of the reagents.
3. Add 10 mL of HNO
3
to each liner. Use the acid to rinse the inside of the liner to ensure that the sample is in
the base of the liner.
4. Wait 15 minutes to allow pre-digestion.
5. Assemble and torque each vessel. See “Vessel Assembly” for detailed instructions.
6. Place the turntable into the MARS 6 cavity and symmetrically distribute vessels. See “Turntable Setup” and
"Vessel Distribution" for detailed instructions.
7. Select and load the “Plant Material” method from the One Touch directory.
8. Close the instrument door and run the preprogrammed “Plant Material” method.
9. After completion of the method, permit the vessels to cool in the automated sequence until the vessels cool to
below 80 ºC.
WARNING
Allow vessels to cool below 80 ºC before opening the microwave door.
To prevent the possibility of severe burns, ensure that gloves and protective gear as outlined in your safety
program are worn.
10. Remove the vessel assemblies from the turntable. See "Vessel Removal" for detailed instructions.
11. If the normal method temperatures are greater than 230 °C AND new liners will be mixed with old liners, the
new liners will need to be conditioned three times using the method that exceeds 230 °C before mixing in.
12. Rinse the liners and plugs with deionized water.