Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Successive determinations of calcium and magnesium in drinking water by complexometric, potentiometric digital titration to two equivalence points
Calcium and magnesium are titrated using an indicator electrode sensitive to the calcium ion and EDTA as the titrant in a solution containing 3,4-dihydroxybenzoic acid or acetylacetone. In this solution, the ratio between EDTA's conditional stability constants for calcium and magnesium is increased so that two pronounced inflection points are obtained on the titration curve. The inflection points are determined in a stepwise, computer-controlled titration. It is possible to determine calcium and calcium + magnesium in drinking water with a relative standard deviation of less than 0,5 %. The absolute accuracy is better than 0,6 % for calcium determinations, and better than 0,8 % for calcium + magnesium determinations. A magnesium content constituting more than 4 % of the calcium content can de determined. A determination of calcium and magnesium can be performed in 3 min.
Successive determinations of calcium and magnesium in drinking water by complexometric, potentiometric digital titration to two equivalence points
Calcium and magnesium are titrated using an indicator electrode sensitive to the calcium ion and EDTA as the titrant in a solution containing 3,4-dihydroxybenzoic acid or acetylacetone. In this solution, the ratio between EDTA's conditional stability constants for calcium and magnesium is increased so that two pronounced inflection points are obtained on the titration curve. The inflection points are determined in a stepwise, computer-controlled titration. It is possible to determine calcium and calcium + magnesium in drinking water with a relative standard deviation of less than 0,5 %. The absolute accuracy is better than 0,6 % for calcium determinations, and better than 0,8 % for calcium + magnesium determinations. A magnesium content constituting more than 4 % of the calcium content can de determined. A determination of calcium and magnesium can be performed in 3 min.
Successive determinations of calcium and magnesium in drinking water by complexometric, potentiometric digital titration to two equivalence points
Aufeinanderfolgende Bestimmung von Kalzium und Magnesium in Trinkwasser durch Komplexbildende, potentiometrische Digital-Titration an zwei aequivalenten Punkten
Christiansen, T.F. (Autor:in) / Busch, J.E. (Autor:in) / Krogh, S.C. (Autor:in)
Analytical Chemistry ; 48 ; 1051-1056
1976
6 Seiten, 7 Bilder, 5 Tabellen, 10 Quellen
Aufsatz (Zeitschrift)
Englisch
Titration of Chlorine: Amperometric versus Potentiometric
| Wiley | 2000
| British Library Online Contents | 2017
The Determination of Calcium and Magnesium by Soap Titration
| Wiley | 1938
Potentiometric Titration of Zinc with a Tetrabutylammonium Electrode
| British Library Online Contents | 1993