Estimation of measurement uncertainty in chemical analysis

Self-test 5.4

Here you can test your understanding of the concepts of random and systematic effects.

1. Partial volatilization of the analyte can be an important source of uncertainty. Is this a random or a systematic effect?

2. Which of the following are random effects and which are systematic effects?

  1. Titration repeatability -
  2. Analyte loss during the sample preparation -
  3. Titrant decomposition during the analysis - 
  4. Matrix effect in liquid chromatography mass spectrometry leading to partial suppression of ionization of the analyte -
  5. Less than 100% purity of the standard substance used for constructing calibration graph.  -
  6. Instrument reading repeatability  -
  7. Contamination of sample with the analyte -
  8. Increased absorbance readings in spectrophotometric analysis caused by interfering substance -

 

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