DETERMINATION OF PHOSPHORUS IN SILICEOUS ROCKS BY ATOMIC ABSORPTION SPECTROPHOTOMETRY WITH A GRAPHITE FURNACE

Phosphorus was successfully determined in standad geological samples by direct methods after dissolution of the sample in HF and acqua regia in a Teflon bomb. The matrix modifier was lanthanum. Conventional stabilized temperature pltform furnace conditions with Zeeman correction are preferred. However, it was possible to use continuum corretion when zirconium-coated "curtained tubes" were used