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

February 23, 2017 | Methodology Statistics | By admin | 0 Comments

By E. Prichard

Chemists in academia and clarify terminology commonly used in analytical chemistry, supplying additional info than the straightforward definition yet no longer explaining how one can make measurements. They comprise definitions which are now not present to aid readers of older files. Examples are supplied usually. The cross-referencing is considerable. disbursed within the US via Springer Verlag.

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Cross contamination is where some of the analyte present in one sample or standard inadvertently transfers to another sample. 9 Cross contamination The results of an analysis for explosives are used as evidence to show that an individual has been handling explosives. A whole batch of evidence had to be rejected because it was found that the inside of a centrifuge used in the analysis had become contaminated with trace amounts of explosive from a broken centrifuge tube. It was not possible for the laboratory to prove beyond reasonable doubt that no cross contamination had occurred.

In addition to the initial inspection of the laboratory the accreditation or certification body will carry out surveillance visits, normally at annual intervals, to confirm that compliance is maintained. A re-assessment visit is carried out every four years. g. seeking accreditation for a new technique. The I S 0 9000 series (International Organization for Standardization) are the quality management standards most commonly used by organisations manufacturing or supplying products or services in the UK and across the world.

The limit of quantitation is the point at which the results from a method become sufficiently unreliable to make quantification suspect. 18 Example: Example of determining limit of quantitation Determining an acceptable limit of quantitation is a matter of judgement. 1 pg L-’. For most trace level analysis the level of quantitation is taken to be 10 so, therefore the limit of quantitation in this example is calculated to be 1 pg L-’with an acceptable uncertainty of 10%. ’5 However, another use of the word is to state that the range is the difference between the greatest and smallest values of a set of measurements.

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