DETERMINATION OF NI AND CR IN SOILS BY SLURRY GRAPHITE-FURNACE ATOMIC-ABSORPTION SPECTROMETRY

The analytical conditions for chromium and nickel determination in soi ls by slurry sampling graphite furnace atomic absorption spectrometry (GFAAS) are presented. Stability tests for slurries have been carried out. The ratio of the amount of the analyte found in the liquid phase to the total amount is investigated. The influence of the soil matrix on the background is described. Less sensitive resonance lines of chro mium rather than an internal gas Bow through the graphite furnace are recommended for some soil samples with high contents of chromium.