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Improvement of Volumetric Method for Continuous Determination of Calcium and Magnesium Using EDTA

Fan Fu

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Abstract

A method for continuous titration of calcium and magnesium using EDTA is proposed in this paper. The NH4Cl is added to the sample solution after titration of Ca2+ by EDTA to keep the sample solution in pH=10. After adding NH4OHNH4Cl buffer solution (pH=10), titration of Mg2+ with same EDTA standard solution is performed. The new method solves the problem that the results of magnesium are systematically high in traditional titration procedure. The method has been applied to the determination of Ca and Mg in geological samples in routine analysis. The results are in good agreement with those provided by other methods. The precision for the sample with w(MgO)=21.10% is 0.6% RSD (n=10).

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What this paper is about

A method for continuous titration of calcium and magnesium using EDTA is proposed in this paper. The NH4Cl is added to the sample solution after titration of Ca2+ by EDTA to keep the sample solution in pH=10. After adding NH4OHNH4Cl buffer solution (pH=10), titration of Mg2+ with same EDTA standard solution is performed. The new method solves the problem that the results of magnesium are systematically high in traditional titration procedure. The method has been applied to the determination of Ca and Mg in geological samples in routine analysis. The results are in good agreement with those provided by other methods. The precision for the sample with w(MgO)=21.10% is 0.6% RSD (n=10).

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Available abstract

A method for continuous titration of calcium and magnesium using EDTA is proposed in this paper. The NH4Cl is added to the sample solution after titration of Ca2+ by EDTA to keep the sample solution in pH=10. After adding NH4OHNH4Cl buffer solution (pH=10), titration of Mg2+ with same EDTA standard solution is performed. The new method solves the problem that the results of magnesium are systematically high in traditional titration procedure. The method has been applied to the determination of Ca and Mg in geological samples in routine analysis. The results are in good agreement with those provided by other methods. The precision for the sample with w(MgO)=21.10% is 0.6% RSD (n=10).

Key concepts: Titration, Magnesium, Chemistry, Complexometric titration, Calcium, Standard solution, Buffer solution, Chromatography

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