Catalytic end-point detection in titrimetric analysis |
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Authors: | Siegbert Pantel Herbert Weisz |
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Institution: | Institut für Anorganische und Analytische Chemie, Albert Ludwigs Universität Freiburg, Albertstr. 21, D-7800 Freiburg i.Br. Federal Republic of Germany |
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Abstract: | In catalytic end-point detection, the first drop of titrant in excess is not used for a stoichiometric reaction with the indicator (as in conventional titrations) but acts as, or liberates, a catalyst for the indicator reaction. A very small excess of titrant thus suffices to catalyze large amounts of the indicator reaction mixture. Such catalytic end-points are therefore very sensitive. Terminology is discussed briefly. The various types of titration (direct, with a “brake”, reversed, indirect and substitution) and of end-point detection (visual, olfactory, photometric, thermometric and electrometric) are described. Applications of these techniques are summarized. |
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