Adsorption-spectrometric and test methods for determining perchlorate ions with thionine on polyurethane foam

Conditions were studied for the extraction of perchlorates from water by the adsorption of their ion associate with the thionine dye on polyurethane foam. The adsorption properties of polyurethane foam were studied by measuring the diffuse reflectance of perchlorate ion associates with thionine adsorbed on pellets of this material. The use and performance characteristics of procedures were studied for the extraction-photometric (to 0.05 mg/L), adsorption-spectrometric (to 1.5 mg/L), and semiquantitative visual test (to 2 mg/L) determination of perchlorates in natural water.