Self-test 6

Repeatability of integration.

Uncertainty of pipetting when making the calibration solutions (different pipettes are used on different days). 

The laboratory is not well air-conditioned – when the weather is cold then air temperature in the laboratory is quite low, when the weather is hot then the laboratory temperature is quite high. 

Actual injection volume of the autosampler is by 5% higher than the analyst thinks.

Because of the nature of the dialysis procedure the dialysate samples are stored at room temperature before loading them to the cooled autosampler possibly causing partial decomposition of the analytes. 

Baseline noise of the chromatogram.

Repeatability of integration.

Uncertainty of pipetting when making the calibration solutions (different pipettes are used on different days).

The laboratory is not well air-conditioned – when the weather it cold then air temperature in the laboratory is quite low, when the weather is hot then the laboratory temperature is quite high. 

Actual injection volume of the autosampler is by 5% higher than the analyst thinks.

Because of the nature of the dialysis procedure the dialysate samples are stored at room temperature before loading them to the cooled autosampler possibly causing partial decomposition of the analytes.

Baseline noise of the chromatogram.

Recovery 

Repeatability 

Within-lab reproducibility

Between-lab reproducibility 

Intermediate precision

Systematic effect caused by the calibration graph

Recovery different from 1

Above average room temperature on a particularly hot day

Incomplete sample matrix decomposition caused by too short digestion time 

Recovery

Repeatability

Bias 

A-Type precision 

Within-lab long term reproducibility