Abstract
The purge gas nature and pressure determines the shift, shape and width of absorption lines in graphite furnaces. Depending on the nature of the gas, red or blue shifts will occur. Absorption line shifts may be used to advantage in several analytical situations. Atomization in argon or nitrogen causes a red shift and broadening of absorption lines. Atomization under pressure enhances these effects. The commercial graphite furnaces are non-isobar in space and time. It is speculated that using Ar/He or Ar/H 2; mixtures, a better overlap is possible between the analyte emission line from a hollow cathode lamp and the absorption line from a graphite furnace. The consequence would be an improvement in sensitivity.
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