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The effect of the physical matrix on accurate measurements using fixed volume analytical techniques

✍ Scribed by Richard J. C. Brown; Peter R. Edwards

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
599 KB
Volume
29
Category
Article
ISSN
1615-9306

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✦ Synopsis

Abstract

In order to perform high accuracy analytical measurements most analytical techniques require some form of calibration using standards of the same quantity as that being measured. The highest accuracy calibration standards are those prepared by mass (gravimetrically) as opposed to by volume (volumetrically). The use of gravimetrically prepared standards to calibrate analytical techniques that rely on fixed volume injections can cause systematic errors, even when the analytical technique does not suffer from a chemical matrix interference. The origin of these errors is explained and is demonstrated experimentally for the analysis of sulphate in synthetic seawater samples, and the measurement of the anionic content of particulate matter following extraction with water and wetting agents; where average measurement biases of +2.7 and –3.2%, respectively, were observed. Proposals are offered for methods to overcome this β€˜physical matrix effect’.

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