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High Doubly Charged?

Question asked by fpmlab on Aug 8, 2019
Latest reply on Aug 29, 2019 by tmcsweeney

Performance reports show incresenly high doubly charged percentages, two weeks ago they were at 11% now averaging around 18%. Tubing has been changed and soaked in 5% HNO3 along with rinsed before use yet percentage continues to rise. Any suggestions?