... Interaction of tungsten(VI) and vanadium(V) with pyrogallol red and bromopyrogallol red in the presence of surfactants . Abstract Complexation of tungsten(VI) and vanadium(V) with pyrogallol red (PR) and bromopyrogallol red (BPR) in the presence cationic and nonionic surfactants were studied by spectrophotometric and colorimetric methods. ... Moscow University Chemistry Bulletin . 2004, Vol. ... Copyright (C) Chemistry Dept., ... Copyright (C) Chemisty Department of Moscow State University . ...