Anionic lead complexes on the solid phase of fibrous filled materials in the reaction with 4(2-pyridylazo)resorcinol

The influence of the nature of anions (iodide, bromide, thiosulfate, pyroph osphate, tartrate, and acetate) in the anionic lead complex adsorbed on a s olid phase of a fibrous sorbent filled with the AV-17 anion exchanger on th e color reaction between lead and 4-(2-pyridylazo)resorcinol (PAR) was stud ied by diffuse reflectance spectrometry. The influence of anions on the com plexation of lead with PAR on the solid phase was discussed for different t ypes of the color reaction. It was demonstrated that the reactions with iod ide at pH 5-10 and with thiosulfate at pH 10 are significant in the determi nation of lead as three-component complexes on the support. In the presence of other anions, lead ions do not react with PAR on the AV-17 solid phase.