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

By E. Prichard

Chemists in academia and clarify terminology common in analytical chemistry, supplying additional information than the easy definition yet now not explaining the right way to make measurements. They contain definitions which are not present to aid readers of older records. Examples are supplied regularly. The cross-referencing is considerable. disbursed 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

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Primary standard is defined as a “standard that is designated or widely acknowledged as having the highest metrological qualities and whose value is accepted without reference to other standards ol‘the same q ~ a n t i t y ” . 6 Primary standard Arguably, the ultimate primary (chemical) standard is silver (often referred to as ‘five-nines’ grade). I7 A primary standard is used to establish a secondary standard. A secondary standard is defined as ‘‘a standard whose value is assigned by comparison with a primary standard of the same q ~ a n t i t y ”It.

The limit of detection for an instrument improves if the signal-tonoise ratio can be increased. Instrument manufacturers should quote how they determine the signal-to-noise ratio. 20 Chapter 2 In practice an instrumental detection limit is of limited use because in analytical chemistry it is rare that no other procedural steps are involved. Normally a limit of detection for the whole analytical method is required. The terminology used in this area is confusing. In general, limit of detection and detection limit are synonymous.

The values for this material may have been obtained by comparison with a CRM. 3 In-house reference material This term might be used to describe a metal alloy sample known to be inherently stable, tested for homogeneity as part of routine production quality control and analysed by both the laboratory's routine method (say, XRF) and an alternative method (say, dissolution and measurement of the solution by ICP-OES). When no suitable reference material is available it is possible to add a known amount of the pure analyte to a matrix of the same composition as the samples (or those containing a very low natural amount of analyte).

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