Electrothermal atomization studies of lead were completed on a tungsten filament atomizer created in the laboratory. Atomizer heating programs based on voltage and current feedback power supplies were investigated. Since each unique instrumental design requires a complete characterization, temperature rather than electrical parameters must be used because temperature is a more reliable variable that can be quantified on any instrument. A temperature model was developed to study the time-dependent temperature of a tungsten filament atomizer at any point during the analysis process. A comparison of the quantitative merits of using peak area versus peak height was also made in the context of atomization temperature within the two types of power supplies. Large differences were found between the equilibrium temperature and the instantaneous temperature during the heating process. The greater heating rate during atomization from the voltage-controlled system yielded data that were more precise and less susceptible to changes in the atomization temperature. Integrated peak area was more robust for quantitation because it is independent of the power supply, as long as equivalent atomization temperatures are used. Peak height was shown to be more precise in some cases and will be more sensitive if the appropriate power supply is being used.
|Commitee:||Dixon, Robert, O'Brien, Leah|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 52/04M(E), Masters Abstracts International|
|Keywords:||Electrothermal atomization, Tungsten|
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