Complexometric titration with potenciometric indicator to determination of calcium and magnesium in soil extracts¹

Titulação complexométrica com indicador potenciométrico para determinação de calcio e magnésio em extratos de solo

Claudia Mara Pereira Cristhiane Anete Neiverth Shizuo Maeda Marcela Guiotoku Luziane Franciscon About the authors

This study proposes a method of direct and simultaneous determination of the amount of Ca2+ and Mg2+ present in soil extracts using a Calcium Ion-Selective Electrode and by Complexometric Titration (ISE-CT). The results were compared to those obtained by conventional analytical techniques of Complexometric Titration (CT) and Flame Atomic Absorption Spectrometry (FAAS). There were no significant differences in the determination of Ca2+ and Mg2+ in comparison with CT and FAAS, at a 95 % confidence level. Additionally, results of this method were more precise and accurate than of the Interlaboratorial Control (IC).

ion selective electrode; automatic titrator; potentiometry

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