Reaction of mercury(II) and xylenol orange-III: determination of microamounts of mercury.
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.
Cabrera-Martín
A
A
Departamento de Química Analitica del C.S.I.C., Facultad de Ciencias, Universidad Complutense de Madrid, Spain.
Peral-Fernández
J L
JL
Burriel-Martí
F
F