Colorimetric determination of common industrial frothers

摘要

Methylisobutyl carbinol (MIBC) and a methoxy polypropylene glycol (Dowfroth 250) were determined by a colorimetric procedure using salicylaldehyde. Linear calibration curves in absorption spectrophotometry were obtained for MIBC between 0.05 and 0 2 ing/sample at ~520 nm, and for D250 between 0.2 and 0.5 mg/sample at -535 nm. When standards and sample are run side by side under identical conditions, errors of approximately 3.5 percent and 6.0 percent in the determination of C_(MIBC) and C_(D250) are achieved. respectively. The analysis is unaffected by the presence of sodium isopropyl xanthate, Ca, and Cu at typical plant concentrations IE the sample- The colorimetric reactivity is demonstrated for a series of common frothers with alcoholic behavior. The method combines the ease of determination with high sensitivity.