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Icpms cone cleaning

Question asked by sls9308 on Nov 3, 2018
Latest reply on Nov 7, 2018 by gareth.pearson

I am running a Icpms 7900 for drinking waters.  Lately I have been cleaning the cones once a week since I keep getting white residue on both the sample and skimmer cone.  My oxide ratio also are getting up to 1.5% and my doublely charged can get up to 20%.  After cleaning the numbers go down to less than 1% oxides and about 3 to 5% for doubly charged ratio.  But then the numbers start to increase the very next day and within a week are to high again.  I put in new cones last week and got the same result.  Any ideas?