formation of a complex with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)-phenol (5-Br-
PADAP), and later analysis by graphite furnace atomic absorption spectrometry (GFAAS)
using octylphenoxypolyethoxyethanol (TritonX-114) as surfactant. The chemical variables
affecting the separation phase were optimized. Separation of the two phases was
accomplished by centrifugation for 15min at 4000rpm. Under the optimum conditions ie, pH …