ICP-MS Active Cleaning

This Information Applies To: All Agilent ICP-MS Systems

Issue:

Some samples may contain "Sticky" elements that take a long time to leave the system. After cleaning all glassware in the Sample Introduction System as per the maintenance DVD, an extra Active Clean can be performed. 

Resolution:

• When “sticky” elements (Tl, Sb, Th, Ag…) are taking too long to rinse out, replace autosampler probe and all other tubing leading up to the nebulizer.

• Option 1 to clean the system: with the plasma off, remove PTFE line from back of nebulizer and hang in a beaker. With all of the sample introduction lines hooked up, move the autosampler probe into 50 ml vials of each of the following solutions:
  • ~30% NH4OH (30 min with peri at 0.3 rps)
  • ~30% HCl (30 min with peri at 0.3 rps)
  • ~30% HNO3 (30 min with peri at 0.3 rps)
  • De-ionized (a few minutes at 0.3 rps)
• Let each of these solutions flow through the whole sample flow path. You might have to change the Tygon tubing after doing this.

• Option 2 to clean the system: Clean the probe rinse port by removal then soaking or actively pumping for 15 minutes for each step using the ALS peristaltic pump using the following solutions:
  • MeOH or IPA to remove greasiness
  • De-ionized Water
  • Hot 2% Citrinox Solution
  • De-ionized Water
  • ~30% NH4OH
  • ~30% HCl
  • ~30% HNO3
  • De-ionized Water

• Additional Cleaning Solutions (used in the Semiconductor industry). Use one or both of the following solutions, either as a rinse or for periodic cleaning

Keywords: Relative Standard Deviation, RSD, memory, contamination, ICPMS, sq, qqq, 7500, 7700, 7800, 7900, 8800, 8900