title: Contributions to the basic problems of complexometry-XXVII. Influence of magnesium on masking of calcium with fluoride in the determination of manganese.
abstract: Determination of manganese in the presence of calcium and magnesium after their masking with ammonium fluoride was reinvestigated. Normally such a determination gives low results caused by co-precipitation of manganese with calcium fluoride. It has been found that the co-precipitation is highest when magnesium is absent in the solution. With increasing concentration of magnesium ions co-precipitation of manganese decreases and at the ratio ca:Mg = 0.5-1 is entirely eliminated. An explanation of this phenomenon is discussed.
authors.affiliation: Institute of Geological Sciences, Charles University, Prague 2, Albertov 6, Czechoslovakia.
authors.forename: J
authors.initials: J
authors.lastname: Adam
authors.forename: R
authors.initials: R
authors.lastname: Pribil