Methods are described for the determination of selenium and tellurium in crude silver chloride produced as a by-product of the refining of gold, and in high-purity uranium oxide. Selenium and tellurium are separated from one another as well as from the numerous other substances in the sample before they are extracted into organic solvents and determined spectrophotometrically. For the determination of selenium 3,3'-diaminobenzidine is used and for tellurium, sym-diphenylthiourea. A minimum of 2 ppm of each element may be determined in silver chloride and 0.3 ppm in uranium oxide. Statistical data are given to show the precision and accuracy of the methods.

The methods presented for determining selenium and tellurium in silver chloride and uranium oxide are precise and accurate, with a minimum of 2 ppm of each element in silver chloride and 0.3 ppm in uranium oxide.

Determination of selenium and tellurium in silver chloride and uranium oxide.

Key Takeaway: The methods presented for determining selenium and tellurium in silver chloride and uranium oxide are precise and accurate, with a minimum of 2 ppm of each element in silver chloride and 0.3 ppm in uranium oxide.