Method 200.7 features an Instrument Performance Check (IPC) solution and requires that the first time the IPC is analysed (i.e.: equivalent to the ICV) it must be recovered within ± 5% and the precision of each measurement of the IPC must be less than 3%. Method 6010 B requires a recovery of ± 10% for both the ICV and CCV with a precision of less than 5%. If the CCV test fails, the problem must be corrected, the instrument recalibrated and all samples since the last successful ICV (Initial Calibration Verification), CCV or check standard must be reanalysed.