Graphite-Furnace Atomic Absorption Spectrometry of Organomercury and Organoselenium in Extracts of Biological Samples with an Organopalladium Matrix Modifier

摘要

The sensitivity of organomercury in organic solutions has been found to be enhanced by applying 15μl of an ethanol solution of Pd(acac)2 (500μg Pd ml-1, acac is acetylacetonate) to a graphite-furnace, which is then heated to make a Pd coating on the furnace. After this treatment, an ethanol solution of the sample is injected to the furnace and measured. With this method, the detection limit of organomercury was found to be 0.25ng. In a slightly different way, in which 2ml of an ethanol solution of PdCl2(PhCN)2 (1000μg Pd ml-1) was added as a matrix modifier to 3ml of an ethanol solution of organoselenium, selenium was determined with a detection limit of 0.12ng. These methods can be successfully applied to the determinations of organomercury and organoselenium in an extract solution of a dolphin liver.