Flow injection extraction- spectrophotometric determination of bismuth with di-(hydrogenated tallow alkyl) dimethylammonium chloride

Abstract

Bismuth(III) (0-25 $mu g$/ml) is determined spectrophotometricaly at 513 nm after extraction into dichloromethane of the ion associate di-(hydrogenatedtallowalkyl)dimethylammonium tetraiodobismuthate. The reagent stream is distilled water, merged with 1.0 M sulfuric acid, 5% potassium iodide and 5% (w/v) ascorbic acid solution. The reagent stream is 0.2% (w/v) di-(hydrogenatedtallowalkyl)dimethylammonium chloride solution. The injection rate is 15 $h^{-1}$. The calibration graph is linear up to 25 $mu g$/ml. The detection limit is 0.35$mu g$/ml Bi. The system is applied on water samples and copper-based alloys.