Features International Sugar Journal
The Blackboard

Analytical work: Precision, accuracy, calibration [Full subscriber]

The final aim of a chemical analysis is to obtain one or more numerical results. Between the recording of measured values and the reporting of numerical results, there are arithmetic calculations, often based on formulae. However, this arithmetic process does not immediately yield an acceptable final analytical result. A vital part of the work is to determine the degree of uncertainty affecting the numerical result. All measurements have a degree of uncertainty, firstly because of the limitation of the measuring instrument: it cannot yield a numerical result with an infinite number of digits or of decimal points, and secondly because…

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