Analytical Measurement Terminology: Handbook of Terms Used by E. Prichard

By E. Prichard

Chemists in academia and clarify terminology normal in analytical chemistry, supplying additional information than the easy definition yet now not explaining find out how to make measurements. They comprise definitions which are not present to assist readers of older files. Examples are supplied more often than not. The cross-referencing is ample. disbursed within the US by means of Springer Verlag.

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30 mg L-’. e. 25 mg L- in aqueous solution. A term frequently linked with range is linearity. This is the ability of the method to give a response which is proportional to the concentration of analyte. Sensitivity is defined as “the change in the response of a measuring instrument divided by the corresponding change in the In analysis the stimulus is often the amount of measurand present in the sample under test. 19, Figure 3, sensitivity is the slope of the calibration curve. g. limit of detection) of a method.

Once the integrity of the standard has been significantly altered then the standard has to be disposed of and a new standard made. The degree to which the information written on the label is 'true at the time of receipt' is the authenticity of the standard. The authenticity of the standard is best determined on initial receipt of the standard by comparison with other or previous standards known by the analyst to be traceable and conform to the specifications on the label. A standard (or sample) may also include some additives that have been added to stabilise the solution.

The spread of the results obtained is a measure of the precision of the measurement. g. all the values were obtained by the same person on the same day using a particular instrument. Precision results obtained under some well defined conditions are normally expressed as repeatability, reproducibility or intermediate precision. Repeatability (of results of measurements) is the closeness of agreement between the results of successive measurements of the same measurand on identical test portions carried out under defined conditions.

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