Abstract

The effect of four different atomization surfaces (uncoated graphite, pyrolitically coated graphite, continuously <i>in situ</i> coated graphite, and molybdenum coated graphite) on the quantitation of vanadium by electrothermal atomization atomic absorption spectrometry was investigated. For the four different surfaces, tube lifetimes ranged from a high of 410 firings (uncoated graphite) to a low of 230 firings (molybdenum coated graphite), mass changes in the range from 5.6 to 7.2% were found, and the peak shape from the uncoated and pyrolytically graphite surface approached a good degree of symmetry. The single addition of several matrix modifiers to an uncoated graphite surface affected the signal over a range of –106.5% for ammonium molybdate to +12.3% for magnesium nitrate. A combined matrix modifier improved the signal from all four surfaces in the range from 12.8 to 34.0%. Detection limits ranged from 2 μg/L for the pyrolytic surface to 19 μg/L for the molybdenum coated surface. Electron micrographs of the four surfaces at various stages of the tube lifetime showed the deterioration of the surface with increasing use.

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