화성암 중의 Selenium 정량 = Determination of Selenium in Igneous Rocks

다국어 초록 (Multilingual Abstract)

A study was performed for determination of trace of selenium in igneous rocks, by means of hydride generation methods with preconcentration. The procedure follows : At first, transfer 10㎖ of sample solution and 10㎖ of hydrochloric acid to a reaction vessel and inject 3% sodium tetrahydroborate solution with a flow rate of 4㎖/min for 45 seconds. Hydrogen selenide is generated from the sample solution by passing nitrogen gas at a flow rate of 125-150㎖/min for 3 minutes. Then the nitrogen gas bearing the hydrogen selenide is introduced in an absorbing solution(3M HC10₄ 5㎖十0.02M KMnO₄ 0.20㎖+0.05M Na₂C₂O₄0.15㎖) through a sintered glass filter At the second step, concentrated hydrochloric acid of 5㎖ with 1M potassium bromide solution of 0.20㎖ are added to the sample solution and then the solution was heated up to 95℃ for 45minutes for reduction of Se(Ⅵ) to Se(Ⅳ). The selenium contents of the concentrated sample solution were determined by A. A. S. The proposed method was applied to the determination of Se in igneous rock samples and satisfactory results were obtained.