Oxidimetric estimation of carbon disulfide by potassium ferricyanide

Abstract

Determination of carbon disulfide was made by using a standard potassium ferricyanide solution. A wighed amount of sample containing carbon disulfide was taken into 10% alcoholic alkali and allowed to stand for 3060 min. for the formation of xanthate. It was oxidized with a definite amount of excessive potassium ferricyanide and a little osmic acid as a catalyst, being kept for 15 min. at 20°C.
The remaining potassium ferricyanide was titrated with ferrous sulfate using dimethylglyoxime as an indicator at pH 710, whereby the end point was estimated by the appearance of red coloration, and the carbon disulfide was determined from the amount of ferricyanide consumed by the xanthate. The xanthate gave sulfate and formate by the oxidation with potassium ferricyanide and the equivalent number against the oxidizing agent was 14.