Dosage titrimétrique du tributylphósphate,de la di-n-hexylsulfoxyde et de l'oxyde de tri-n-butylphosphine par les acides de lewis avec repérage visuel du terme

Tri-n-butylphosphate, tri-n-butylphosphine oxide and di-n-hexylsulfoxide were titrated with SnCl₄, SnBr₄ and TiCl₄ in anhydrous 1,2-dichloroethane with malachite green or crystal violet as indicator. Best results were obtained when SnCl₄ was used with malachite green as indicator. The accuracy of the method is about 1–2% for complex concentrations greater or equal to 0.05 M at the equivalence point.