title: Matrix modification for determination of selenium in geological samples by graphite-furnace atomic-absorption spectrometry after preseparation with thiol cotton fibre.
abstract: A graphite-furnace atomic-absorption method has been developed for the determination of selenium in geological samples at or below the mug g level after decomposition of the sample with a mixture of perchloric, hydrofluoric and nitric acids and separation of selenium from the sample matrix with thiol cotton fibre. A few micrograms of palladium are added as a matrix modifier for the atomic-absorption determination. In the presence of palladium the charring temperature for selenium can be raised to 1100 degrees , and the signal enhancement is greater than with other matrix modifiers reported in the literature.
authors.affiliation: Institute of Environmental Chemistry, Academia Sinica, P.O. Box 934, Beijing, People's Republic of China.
authors.forename: S
authors.initials: S
authors.lastname: Xiao-Quan
authors.forename: H
authors.initials: H
authors.lastname: Kai-Jing