Verbesserte endpunktsbestimmung in der potentiometrischen analyse |
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Authors: | FL Hahn |
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Institution: | Durango 283, México 7, D.F. México |
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Abstract: | If in a potentiometric titration each addition of reagent equals Δv and if the observed potential steps are, in decreasing order, ΔEm, ΔE1 and ΔE2, the ratio ρα = is formed; ραΔv is the difference between the equivalence point and the known volume of reagent next to it. Both an extraordinary increase in the precision and a valuable simplification of the analysis are obtained. For Q = < 2.5 or ρα < 0.25 this value is approximated; but in this case a new series with doubled intervals may be formed from the potential steps observed in which ρα is very near to 0.5, found hence absolutely accurate. |
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