PerkinElmer aanalyst 200, User Manual

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AAnalyst 200 User’s Guide
6-43
Rinsing the Burner System
Before you extinguish the flame or begin maintenance or disassembly procedures, you must rinse
the burner system. After you extinguish the flame, allow the burner head to cool.
To rinse the system
The procedure for rinsing the burner system depends on the type of samples that you have
analyzed.
Recommendations:
•
If the sample solutions contained organic solvents, use a multi-rinse procedure to remove all
traces of the solvents from the system.
•
If the sample solutions contained toxic substances, you must rinse all traces of these
substances out of the system.
•
If the sample solutions contained high concentrations of copper, silver or mercury salts,
which can form unstable acetylides, you must rinse all traces of these substances out of the
system.
Procedures
If you used only aqueous solutions during the analyses.
•
Aspirate deionized water for 5 minutes.
If you used organic solvents during the analyses.
•
Aspirate for 5 minutes an organic solvent that is miscible with the samples that have just
been aspirated.
•
Aspirate for 5 minutes methanol or another solvent that is miscible both with water and the
solvent used previously.
•
Aspirate 1% (v/v) nitric acid solution for 5 minutes.
•
Aspirate deionized water for 5 minutes.
To extinguish the flame
1. With the flame still burning, aspirate the correct rinsing solutions to rinse the burner system.
Either aspirate the solutions manually or use the flame autosampler.
2. Touch the Flame tab to display the Flame page.
3. Touch the Off side of the Flame On/Off switch. The indicator in the switch extinguishes.
The system uses a predetermined shutdown sequence to extinguish the flame safely.
4. Shut down the gases to the spectrometer at source.
5. Touch the Bleed Gases button to depressurize the gas lines.