I'm using Agilent 7700x ICP-MS and analyzed samples containing Cu, Zn, Cd and Gd below 50 ppb. I used standards from 5 - 200 ppb for the calibration curve. For each standard and unknown sample, I've got an error message that CPS RSD is over the allowed maximum = 5.00.
eg: 63 Cu [ No Gas ] : CPS RSD value = 7.45 is over the allowed maximum = 5.00
Can someone please give me an answer?