By E. Prichard
Chemists in academia and clarify terminology widespread in analytical chemistry, supplying additional information than the straightforward definition yet now not explaining how one can make measurements. They contain definitions which are not present to aid readers of older files. Examples are supplied in general. The cross-referencing is considerable. allotted within the US through Springer Verlag.
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Additional info for Analytical Measurement Terminology: Handbook of Terms Used in Quality Assurance of Analytical Measurement
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. 14 Precision in terms of analysis An analytical method is used to determine polychlorinated biphenyls in transformer oil by solvent extraction and gas chromatography.
The true value is the value that would be obtained by a perfect measurement. However, true values are by nature indeterminate: it is The Analytical Method 17 never actually possible to eliminate all measurement uncertainties. For some quantities a conventional true value is used. Conventional true value is defined as a “value attributed to a particular quantity and accepted, sometimes by convention, as having an uncertainty appropriate for a given p u r p o ~ e ” . 0221367(36) can be used. ’ The precision of an analytical method is evaluated by making repeat independent measurements on identical samples to determine the spread of results.
The measured concentration of americium-241 in soil will be low due to the interference caused by the solid material in the sample. Therefore, the sample will require pre-treatment to remove the interferents before the americium-241 concentration can be measured. 42 Chapter 4 In spectrophotometric measurements, for example, interference means any chemical species, which will emit or absorb energy at the same spectral wavelength as the analyte under investigation. Interferents can affect the measurement in a positive or negative way.
Analytical Measurement Terminology: Handbook of Terms Used in Quality Assurance of Analytical Measurement by E. Prichard
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