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Indirekte Bestimmung von Sulfat neben Phosphat mit Hilfe der atomaren Absorptionsspektrometrie
Author(s) -
Magyar B.,
Santos F. Sanchez
Publication year - 1969
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19690520334
Subject(s) - chemistry , solubility equilibrium , solubility , barium , inorganic chemistry , analytical chemistry (journal) , chromatography
The final equilibrium in the formation of solid BaSO 4 is reached very slowly when solutions with Ba 2+ and SO 4 2−are mixed. The ion product Lp ″ = [Ba 2+ ] · [SO 4 2− ] of the concentrations remaining in solution however becomes rather constant after about 1/2 hour already, especially when the suspension is seeded with a specially prepared BaSO 4 . The apparent solubility product–somewhat larger than the theoretically expected value–varies with the composition of the solution (other solutes present than Ba 2+ and SO 4 2− ) and the equilibration time, but it is independent of the Ba/SO 4‐ ratio. This allows a great improvement of the indirect determination of sulphate by adding barium and determining its excess by atomic absorption.