Distillation apparatus for removal of interfering substances during quantitative analysis of industrial waste waters, saline and reagent grade water. Designed for 50mL or less of aqueous samples. The reflux distillation process releases cyanide as HCN from cyanide complexes which is absorbed in a scrubber containing a sodium hydroxide solution. Purge tube has 50mL capacity. This unit features the addition of a sulfide scrubber between reaction flask and absorber tube. Supplied with LG-1004 style Keck clamps for joints on the sulfide scrubber. Condenser and scrubber dispersion tube joints are 14/20; all others are 29/42. May be used with other midi-scale distillation systems.