Hi, we are having low sensitivity for low masses and high drift in our ICP-MS 8900. I've cleaned the lens and spray chamber, the cones and torch are new. I checked the nebulizer for any blockages and replaced the tubing. EM is not reaching near the limit. But the problem still persists. We have received a lot of ¨guides¨ and tests to do from Agilent representatives in Argentina, but no one has worked. We need urgent assistance.