Acid Soak Cleaning Procedure For The Torch For Aqueous Or Acid-Based Samples (One Piece And Semi-Demountable Torches) - Agilent Technologies 5800 User Manual

Maintenance and Troubleshooting
Acid soak cleaning procedure for the torch for aqueous or acid-based
samples (one piece and semi-demountable torches)
See Page 27 for demountable torch disassembly instructions.
Figure 14. Torch components where 1. Ball joint, 2. Gas ports, 3. Torch securing ring (demountable
torch only), and 4. Torch outer tube
To clean the torch:
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Prepare a 50% Aqua Regia solution (1 part deionized water to 1 part Aqua
Regia) in a wide diameter open beaker. To make Aqua Regia combine 1:3
concentrated nitric acid: hydrochloric acid.
Place the beaker containing the acid solution under the torch cleaning stand.
Soak the quartz parts of the torch in 50% aqua regia for at least 1 hour. The
length of time required for the cleaning procedure will depend upon the extent
of the contamination. Do not leave the torch in the acid for longer than 4
hours. If deposits remain after using 50% Aqua Regia, repeat the cleaning
process using a higher concentration of Aqua Regia.
Place the torch in the aqua regia solution through the hole provided in the
torch cleaning stand as shown in Figure 15A, B, C and D. Ensure the quartz
outer tube along with the injector is immersed in the solution.
For soaking the injector without the quartz outer tube-set, the torch injector
tube plate should be installed to the torch cleaning stand to minimize
exposure of the torch body to the acid fumes.
For semi or fully demountable torches, the quartz outer tube-set can be
removed and soaked separately in a beaker of aqua regia (Figure 15D).
Pipette some of the acid through the ball joint of the injector to remove build-
up from the lower part of the injector. See Figure 16A.
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Agilent 5800 and 5900 ICP-OES User's Guide