Checking for a Blocked Nebulizer

Blocked nebulizers are the source of many instrument performance issues including loss of sensitivity and poor precision, especially when running organics, high solids, or high salt concentration solutions.

The Nebulizer Test helps you to verify nebulizer performance.

Run this test if you notice no mist in the spray chamber or have low sensitivity during analysis.

Mist (wetting) formed

Before you start:

1. Turn on the external exhaust and then the ICP-OES.
2. Open ICP Expert software.
3. Install the nebulizer, spray chamber and torch and ensure the gas supply is connected and on.

For a good reference point, perform this test when the nebulizer is new and compare the results when testing for blockages.

To access the test:

1. Click Instrument on the toolbar.
2. Click Dashboard.
3. Select the appropriate nebulizer from the 'Nebulizer Select' drop-down menu. Select 'Other' if your nebulizer is not available in the list.
4. Click Start to run the test.
5. Once the test is finished, click the Status tab and then Tests to view the results.

What to do if the Back Pressure Test Fails

High Back Pressure

This is often caused by a blocked nebulizer or torch injector tube.

• Clean the nebulizer
• Clean the torch

Low Back Pressure

This is often caused by the nebulizer leaking or not connected.

• Check connections and reinstall the nebulizer