I run an Agilent Technologies Graphite Furnace and a recurring problem when analyzing Lead is that the continuous calibration verification, (CCV), QC slowly drifts lower from the target (20ug/L). This drop in target can cause the last bracket to fail sometimes, but sometimes the drops are slow enough that the CCV clears acceptable ranges. The absorbances of the CCV's are very precise but gets lower than the initial target. The injection of the samples is done automatically.
Please ask any questions you might think could help understand the situation, Thank you!
Background-
Agilent Technologies
Instrument GTA 120 and 200 Series AA
Samples: Water
Sample Matrix: 0.2% Nitric acid
Acceptable range: Initial calibration Verification (ICV) 20ug/L +/-5%
CCV 20ug/L +/-10%
Laboratory Fortified Blank Recovery 85-115%
Laboratory Fortified Sample Matrix (LFM) Recovery 70-130%
Continuous Calibration Blank (CCB)
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