EDTA titration of calcium and magnesium with a calcium-selective electrode
1970; Elsevier BV; Volume: 17; Issue: 5 Linguagem: Inglês
10.1016/0039-9140(70)80085-6
ISSN1873-3573
Autores Tópico(s)Electrochemical sensors and biosensors
ResumoDirect semi-automatic and automatic derivative potentiometric EDTA procedures for the determination of calcium and/or magnesium with a calcium-selective electrode are described. Calcium is titrated in the presence of magnesium at pH 12.0 and the total calcium and magnesium is determined at pH 9.7. Calcium in the range 1-8 mg and magnesium in the range 0.7-5 mg are determined semi-automatically with average errors of about 0.2 and 0.3% respectively and automatically with average errors of 0.4 and 0.7%. Titration times vary from a few seconds to a few minutes.
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