The study on determination of selenium with potassium butyl xanthate

Abstract

A simple and fast ultraviolet spectrophotometric method was used to determine selenium (IV) through the formation, separation and quantitative determination of potassium butyl xanthate -selenium complex. The complex absorbed light sharply at 375 nm. The optimum acidity of the complex formation was between pH 3.4 – 4.0. The absorption value was no change in 120 minutes after the complex was extracted by carbon tetrachloride. The sensitivity of the colour reaction was 0.2 Hg cm^-2; The content of selenium (IV) was within 0–30 μg and linear relation was good, Y=0.07X+0.025; relevent coefficientr = 0.9997. A great quantity of I, Cu, Co, Mn and SO ^-2₄ , PO ^-3₄ contained in the sample had no effect on the results of determination when selenium was determined. When content of Fe was over l00μg/ml and Zn was over 180 μg/ml, there was disturbance to the determination, but the disturbance was removed by adding EDTA. When making use of the method to determine containing selenium additive: Cv = 6.85, rate of recovery was 97.2%, wild jujube: Cv = 3.22, rate of recovery was 90.1%, soil sample: Cv = 4.64, rate of recovery was 86.2%. The method for sensitivity measured was approximate to 2, 3-diamino naphthalene (DAN) fluorescence method.