Thermo Scientific iCAP 7000 Series Manual page 68

iCAP Customer Familiarisation Manual
10.5.3 Solid deposit in sample capillary
Note: This step assumes that a passage still exists through the
contaminating material (i.e. the tip is not entirely clogged).
Try to deduce the chemical nature of the deposit from the type of samples that are
being analysed and select the solvent most likely to dissolve it. Inject the solvent
into the nozzle with a plastic dropper or squeeze bottle until the affected area is
filled. Expel the solvent with compressed gas. Refill and expel the solvent
repeatedly. Examine the nebuliser under magnification. If the material is gone, rinse
the nebuliser with isopropyl alcohol and dry thoroughly
Immerse the nozzle in a rinse solution. Warm the solution for stubborn deposits.
Follow with a rinse of pure solvent, then isopropyl alcohol and dry thoroughly.
If the deposit remains after prolonged soaking, apply pressurised gas at the
appropriate input(s) to help force the deposit away.
10.5.4 Organic matter
Immerse the nozzle of your nebuliser in a hot cleaning solution of chromic and
sulphuric acids at 100ºC
Caution: This solution is corrosive, use suitable precautions
Allow the solution to rinse into the passages of the nebuliser until the affected area
is filled. Expel and replace the solution at intervals until the deposit is gone or until
the chromium reduction (green colour) ceases. Rinse the nebuliser thoroughly with
water, then with isopropyl alcohol and dry completely.
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