Foundations of Analytical Chemistry by Miguel Valcárcel Cases Ángela I. López-Lorente & Ma Ángeles López-Jiménez

Author:Miguel Valcárcel Cases, Ángela I. López-Lorente & Ma Ángeles López-Jiménez
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

6.1.6.2 Static Systems (2 Slides)

Slide 6.36

In static systems, the signal remains constant over time.

Not all measuring instruments are equally capable of discriminating signals for different sample components. Thus, UV–visible absorption spectroscopy has a low discrimination potential. As can be seen in the slide, identifying all three analytes (A, B, and C) in this example is impossible because their absorption spectra (absorbance vs wavelength recordings), in black, are very similar, so no wavelength zone exists where each analyte can be detected in the presence the other two. If no alternative detection equipment is available, the analytes must be discriminated chemically. For example, if a reagent R reacts selectively with only one of them (e.g., A) to form a bluish red chelate AR and the chelate absorbs at 600 nm without interference from the other two analytes, A can be reliably identified.

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