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

By E. Prichard

Chemists in academia and clarify terminology frequent in analytical chemistry, delivering additional information than the straightforward definition yet no longer explaining the way to make measurements. They comprise definitions which are not present to assist readers of older records. Examples are supplied normally. The cross-referencing is considerable. disbursed within the US through Springer Verlag.

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A key parameter in determining whether a method is suitable for use in trace analysis relates to the smallest amount of an analyte that can be detected. There are several terms used to describe this. Each has a specific meaning and the analyst needs to make clear the meaning of the terms used. e. 2). The detector of the instrument will have a detection limit which is the point where, with a stated probability, one can be confident that the signal due to the measurand can be distinguished from the instrumental background signal.

A semi-quantitative method provides an estimate of analyte concentration, perhaps to within an order of magnitude or sometimes better. Sometimes it is necessary to analyse a large number of samples in a short period of time to identify samples that give a positive result. Screening methods are often used in this situation. The screening method used must be relatively inexpensive, capable of rapid analysis of samples and reliable enough not to produce large numbers of false positive results or false negative results.

1 unit, etc. 20 Testing a method for ruggedness Checking a method for ruggedness will highlight the main parameters that need to be carefully controlled. For example, in the determination of cadmium release from ceramic ware, acid is added to the item of ceramic ware and left for 24 hours. During this period, the time, temperature and acid concentration will determine the amount of metal leached. Experiments show that temperature is a key parameter (results change by ca. g. to within & 1 "C. Time is far less critical (result changes by ca.

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