[Pradeep]

I am working with AAS. When I am inspecting the histroy of Absorbance readings for K, I saw it has been decreased gradually with time. We chaged the Lamps, Acetaline, And standards also. But we couldnt get the orginal absorbance values. The absorbance valus for all other elimants are not decresing like potasium. What would be the cause for this?

Any one knows a remady?

Best.