Abstract
Selenium is evolved from organic materials and from rocks and soils, after admixture with silicic acid and with silicic acid/cellulose, respectively, by combustion in oxygen under dynamic conditions in a special combustion apparatus. While concomitant elements that form sparingly volatile oxides remain in the ash on the sample holder, seleniun dioxide volatilizes and condenses on a cold finger, whence it is dissolved off with hydrochloric acid (1 + 1) or nitric acid (65% w v ) by boiling under reflux. The isolated selenium is determined either by hydride-generation a.a.s. or by differential pulse cathodic stripping voltammetry. Detection limits for the overall procedures lie at 3 and 30 ng g -1 respectively.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call