Transcription of Selectivity in Analytical Chemistry
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Selectivity in Analytical Chemistry
Selectivity in Analytical Chemistry Recommendations for its UsePoster presented at the IUPAC Congress/General AssemblyJuly 2001 Evolution of the terminologyThe use of the term Selectivity has evolved in parallel with thedevelopment of more sensitive and discriminating methods that canquantify analytes with less interference from other componentsthan earlier methods were able to do. Modern methods oftencomprise several strategies that introduce their own Selectivity toreduce interferences. In this way, highly selective methods can correct use of the term Selectivity and its clear distinctionfrom the term specificity are discussed. Selectivity interactionsSeveral kinds of interactions are used in the Selectivity -generatingsteps leading to the final interactions are, ,chemical reactionsassociate formationadsorption to surfacesinclusion phenomenaabsorption of radiationbiochemical (immunochemical or enzymatic), orelectrochemical (redox) principlesSelectivities in methodsCurrent Analytical methods are based on multistage separation anddetection are often determined with methods based on detectionselectivity, , atomic emission techniques for all types of species rely on Selectivity inthe separation process, separation techniques.
Selectivity is the recommended term in analytical chemistry to express the extent of interferences. To avoid confusion, the use of the term specificity is to be discouraged, as it is incorrect. A method is either specific or not. Few, if any, methods are specific. 2. Definition of Selectivity Selectivity refers to the extent to which a method ...
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