title: Reaction of mercury(II) and xylenol orange-III: determination of microamounts of mercury.
abstract: Xylenol Orange and mercury(II) react in the presence of various bases, such as hexamine, pyridine and ammonia, to form ternary complexes, which conform to Beer's law. The 1:1:1 Hg(II)/XO/ base complex at pH 6.1 has an absorption maximum at 590 nm and a molar absorptivity of 2.2 x 10(5) l.mole(-1).cm(-1). In the absence of the base the Hg(II)(XO)(2) complex at pH 7.5 and 580 nm has a molar absorptivity of 1.7 x 10(5) l.mole(-1).cm(-1). Interferences are discussed.
authors.affiliation: Departamento de Química Analitica del C.S.I.C., Facultad de Ciencias, Universidad Complutense de Madrid, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Cabrera-Martín
authors.forename: J L
authors.initials: JL
authors.lastname: Peral-Fernández
authors.forename: F
authors.initials: F
authors.lastname: Burriel-Martí