Analytical Measurement Terminology: Handbook of Terms Used - download pdf or read online

By E. Prichard

ISBN-10: 0854044434

ISBN-13: 9780854044436

Chemists in academia and clarify terminology conventional in analytical chemistry, delivering additional info than the easy definition yet now not explaining find out how to make measurements. They contain definitions which are now not present to aid readers of older records. Examples are supplied more often than not. The cross-referencing is ample. dispensed within the US via Springer Verlag.

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Extra info for Analytical Measurement Terminology: Handbook of Terms Used in Quality Assurance of Analytical Measurement

Example text

Another way that has been used to describe the limit of detection of an analytical method is, “the detection limit of an individual analytical procedure is the lowest amount of an analyte in a sample which can be detected but not necessarily quantified as an exact ~ a l u e ” . ’ ~ In practice it is not easy to determine the detection limit. It is more common The Analytical Method 21 to determine the lowest concentration at which the analytical procedure performs reliably. This is known as the limit of quantitation or is sometimes referred to as the quantitation limit or limit of determination.

5 mg L - ' and can base any judgement on this fact. *The reported uncertainty is an expanded uncertainty calculated using a coverage factor of 2 which gives a level of confidence of 95%. The A nuly t ical Method 27 The coverage factor chosen depends on the level of confidence required. For most purposes k = 2 is used, where it is assumed that the distribution is normal and the level of confidence is 95%. 3 Reference Materials and Chemical Standards Of the two terms, reference materials and standards, the latter has so many meanings that care needs to be taken in its use.

17 Example of determining a detection limit for a method An analyst needs to determine the limit of detection for an analytical method used to determine the concentration of lead(I1) ions in water by inductively coupled plasma-mass spectrometry. 03 pg L-I. 1 pg L- using a numerical factor of 3. Another way that has been used to describe the limit of detection of an analytical method is, “the detection limit of an individual analytical procedure is the lowest amount of an analyte in a sample which can be detected but not necessarily quantified as an exact ~ a l u e ” .

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


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