Checking for a Blocked ICP-OES Nebulizer

Answer

This Information Applies To: Agilent 5000 Series ICP-OES

Issue

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 ICP-OES backpressure Nebulizer test verifies nebulizer performance. Run this test if you notice no mist in the spray chamber, have low sensitivity during analysis, or high % RSDs on your replicates. Blockages and partial blockages may not be identified ny visual identification. 

Steps to follow

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 that the gas supply is connected and turned on. 

   Tips: Perform this test when the nebulizer is new and compare to the results when testing for a blockage.

4. On the instrument toolbar, click Dashboard > Nebulizer Select drop-down menu >  and select the appropriate nebulizer or Other if nebulizer is not available in the list.

5. Click Start to run the test.

6.  Once the test is finished, click Status > Tests to view the results.

7. A High backpressure result indicates a partial or fully blocked nebulizer or torch injector tube. To correct:

   1. Replace the nebulizer with a brand new one (preferably) or clean one.

   2. Clean the nebulizer.

   3. Clean the torch injector tube.

8. A Low backpressure result indicates a leak on the nebulizer supply line, the internal capillary of the nebulizer is cracked or broken, or the nebulizer is not installed correctly. To correct:

   1. Check the connections and reinstall the nebulizer.

   2. Check the nebulizer supply lines for cracks.  

Learn how to effectively troubleshoot your Agilent ICP-OES: ICPOES-5110-1270e - Agilent 5110 ICP-OES Maintenance and Troubleshooting  e-learning course available from Agilent education