L22 - Metal Analysis Part II CHM410/ENV1410 December 6,...

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M e t a l A n a l y s i s Part II CHM410/ENV1410 December 6, 2011 Holly Lee hlee@chem.utoronto.ca
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Atomic Emission Spectroscopy (AES) more cost-effective than AAS simultaneous analysis of many elements (~60) specific, sensitive, reproducible Recall: Na emission spectrum
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excitation 1. Flame (Flame photometry) low-temp. ~3000K easily excited metals (Group IA, IIA e.g. Li, Na, K, Ca) 2. Electric Discharge (Arc or Sparc) electrode coated with sample (solid) arc source: 3000K sparc source: 40000K ionization issues based on collisions with e - with gaseous atoms to sputter sample off the electode surface one-shot atomization experiment poor precision qualitative 3. Plasma (ICP-AES) electrically neutral, gaseous mixture of atoms, ions, and electrons high-temp. 6000-10000K atomization and excitation source pure Ar or He no oxidation minimal ionization effects due to high [e - ] in plasma ↓ inter
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This note was uploaded on 01/05/2012 for the course CHM 410 taught by Professor - during the Fall '11 term at University of Toronto- Toronto.

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L22 - Metal Analysis Part II CHM410/ENV1410 December 6,...

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