title: [Schiff base type onno spectrophotometric determination of magnesium].
abstract: By condensing hydrazide salicylic acid with o-hydroxy carbonilic compounds it was obtained 2--hydroxy acetophenon--salicyl hidrazina, Schiff base--type ONNO. These Schiff bis bases present a good capacity of complexing the Mg (II) ions. The above mentioned Schiff base forms complex with Mg (II) cation, with maximum absorbance at 386 nm, and molar absorbtivity (epsilon) = 6.27 x 10(4) mol-1.L.cm-1. The complex with Mg (II) presents a maximum stability at pH = 9.6 - 10.0. The calculated apparent stability constant is K = 3.18 x 10(3). The absorbance is proportional to Mg (II) concentration in the range of 10-60 mg/mL. In this range, the Lambert--Beer law is respected, the linearity coefficient being 0.9818, SD = 0.83, RSD = 0.84 (n = 6). The results obtained for spectrophotometric determination of Mg (II) using this Schiff base as reagent were successfully applied to pharmaceutical products containing Mg (II) cation.
authors.affiliation: Disciplina Chimie analitică şi Analiză instrumentală, Facultatea de Farmacie, Universitatea de Medicină şi Farmacie Gr.T. Popa Iaşi.
authors.forename: Gladiola
authors.initials: G
authors.lastname: Tântaru
authors.forename: Nela
authors.initials: N
authors.lastname: Bibire
authors.forename: V
authors.initials: V
authors.lastname: Dorneanu
authors.forename: Maria
authors.initials: M
authors.lastname: Stan
mesh_terms: D000465:Algorithms; D008274:Magnesium / Q000032:analysis*; D012545:Schiff Bases / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
chemical_list: D012545:Schiff Bases; D008274:Magnesium