ENCH 213 Lecture Notes - Lead, Viscosity, Vaporization

• School: Queen's University
• Department: Chemistry
• Course: ENCH 213
• Professor: Diane Beauchemin

Document Summary

Flame atomic absorption spectroscopy (faas: graphite furnace atomic absorption spectroscopy (gfaas) Basic principles everything is first atomized lowest allowed excited state is called resonance transition: most probable. In atomic emission spectroscopy, it is desirable to have a high concentration of the element in the form of: atoms in the ground state, atoms in the excited state, ions. A higher temperature in the atomizer would: be a benefit in atomic absorption, be a benefit in atomic emission, have a negative effect on both atomic absorption and atomic emission. Line spectra are emitted by: hot solids, excited polyatomic molecules, molecules in the ground electronic state, excited atoms and monatomic ions. Most common is nebuliser spray chamber: transforms sltn into aerosol. At 90o to atomizer b/c only need to excite, not go through. Processes involved and effect of residence time in atomizer. If droplet too big won"t go through 3 stages.