Spectrophotometric end-point detection for determination of magnesium in the presence of calcium and phosphate by titration with CDTA
β Scribed by Donald E. Jordan; Donald E. Monn
- Publisher
- Elsevier Science
- Year
- 1967
- Tongue
- English
- Weight
- 355 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0003-2670
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## Abstract Under the conditions described the determination of calcium in the presence of an equivalent amount of magnesium, using Calβred as indicator, could tolerate up to 2.0 mg. of iron, 1.0 mg. of manganese, 3 mg. of aluminium and up to 6 mg. of phosphate in 50 ml. of solution.
An automated standard additions method with an ion-selective electrode is used to determine free fluoride in plasma, urine and sea water; the amounts of pH buffer and sequestering agent are minimal. The presence of uncomplexed metal ions was allowed for in the data treatment by using modified Nernst