Kinetic determination of traces of cysteine by its inhibitory effect on the silver-catalysed phloxin-persulphate reaction.
Cysteine has an inhibitory effect on the silver-catalysed phloxin-persulphate reaction at pH 5. When the eysteine/silver ratio is < 1, a decrease in the reaction rate is the only observed effect. However, when the ratio is 1, an induction period appears. The length of the induction period is proportional to the cysteine concentration and allows the quantitative determination of cysteine and silver.
Cordoba
M H
MH
Department of Analytical Chemistry, University of Murcia, Murcia, Spain.
Viñas
P
P
Sanchez-Pedreño
C
C