The spectrophotometric determination of gold with bromopyrogallol red
1980; Elsevier BV; Volume: 25; Issue: 3 Linguagem: Inglês
10.1016/0026-265x(80)90282-9
ISSN1095-9149
AutoresEva Matoušková, I. Němcová, V. Suk,
Tópico(s)Analytical Chemistry and Sensors
ResumoOptimum conditions were found for the reaction of Au(III) with bromopyrogallol red and a new spectrophotometric determination of Au(III) ions was developed. At a wavelength of 400 nm the Lambert-Beer law is followed in a range of 0.1 to 3.0 μg Au ml−1 and the absorption coefficient ϵ = 3 × 104 M−1 cm−1. The effect of cationic tensides on the studied reaction was also studied; it was found that in their presence the properties of the system are strongly affected by the ionic strength of the solution. The changes observed are a result of the effect of the ionic strength on the dissociation constant of the DG-tenside system.
Referência(s)