Determination of Selenium in Geochemical Samples Such as Drainage Sediment

Abstract

Selenium is one of the inevitable elements in nature, which is required in the study of gold mineralization law organisms also contain trace amounts of selenium, which is harmful to humans when it is extremely high. It is found in soil and rocks, but it is extremely low at 6x10-7. Selenium is widely used in industry, and can be used to make pigments, semiconductors, and some electronic equipment. With the gradual acceleration of China's industrialization process, the discharge of industrial wastewater will lead to the increase of selenium content in crops and affect people's health, so it is of great significance to the determination of selenium content of industrial wastewater. Among the most common is fluorescence spectrophotometry and graphite furnace atomic absorption method. However, in the actual test, the measurement results could not be accurately estimated due to the low selenium content. In order to effectively measure the content of selenium in the sample, the hydride-atomic fluorescence method was adopted, and various measurement conditions were studied. In the experiment, ascorbic acid and thiourea were used to reduce selenium and purify selenium. On the basis of reducing the cost and improving the efficiency, several effective methods are summarized.