Abstract
Calcium and magnesium ions form 1:2 complexes with beryllon-II [2-(8-hydroxy-3,6-disulpho-1-naphthylazo)-1,8-dihydroxy-naphthalene-3,6-disulphonic acid at pH 11.8. The apparent molar absorptivities at 605 nm are 3.0 × 10 3 and 8.4 × 10 3 l mol −1 cm −1 for the calcium and magnesium complexes, respectively. Calcium and magnesium can be determined sequentially by destroying the calcium complex by adding Pb—EGTA solution after the total has been measured. The method is applicable to river and well water.
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