April22_2005_2pp

April22_2005_2pp - April 22, 2005 Office Hours: Cancelled...

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1 April 22, 2005 ¾ Office Hours: Cancelled Today / (Honors Day) ¾ Exam #3: ¾ Solution Key to be posted over weekend ¾ Graded Exams by Wednesday Happy Earth Day! 2 Mass Spec: The “Ultimate Detector”? ± Provides: ¾ Molecular/Atomic weights of analyte ¾ Structural details of analyte ¾ Sensitive, accurate and precise quantitation ± Easily coupled with many other methods: •G C -M S ICP-MS LC-MS •L
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3 ICP-MS ¾ ICP: great source of atomic ions 9 many elements >90% ionized at ICP temperatures (8-10,000 K) How to interface with MS? 4 ICP-MS: Sampling Ions Sampling Cone (water-cooled) Expansion Zone (1 torr) Skimmer Cone ICP: 8000 K 1 atm pressure
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5 ICP-MS: Results ¾ With Quad Mass Analyzer: • unit mass resolution • detection limits: sub-ppb •> 4 decades LDR • rapid scanning isotope ratio information available Also: •TOF
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This note was uploaded on 05/15/2010 for the course CHEM 221 taught by Professor Joelgoldberg during the Spring '10 term at UVM.

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April22_2005_2pp - April 22, 2005 Office Hours: Cancelled...

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