Estimation of measurement uncertainty in chemical analysis

Self-test 5.3

Here you can test your understanding of the concept of uncertainty source and how to recognize uncertainty sources in different situations.

1. Before the analysis sample pre-treatment is carried out. Some spiking experiments were made and recovery estimates (R) were obtained. In which case can we be sure that there is systematic loss of the analyte during sample preparation (the uncertainties are expanded uncertainties at k = 2 level)?

2. Potassium iodate (KIO3) solution  was prepared in a 100 ml volumetric flask by weighing 0.1208 grams of KIO3 (with purity of 99.5%) into the volumetric flask using an analytical balance with digital reading of 0.1 mg and filling the flask to the mark. The analytical balance was calibrated before weighing. What are the uncertainty sources of the potassium iodate molar concentration in the solution according to the presented data?


 

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