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picture1_Analysis Ppt Repost 77695 | Bkamber Presentationaugust2010


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File: Analysis Ppt Repost 77695 | Bkamber Presentationaugust2010
drivers behind geo and cosmochemical analysis desire to analyze sub nanogram quantities of implanted solar wind returned cometary material dust in antarctic ice etc analytic equipment sims secondary ion mass ...

icon picture PPT Filetype Power Point PPT | Posted on 03 Sep 2022 | 3 years ago
Partial capture of text on file.
     Drivers behind geo- and 
     cosmochemical analysis
 Desire to analyze sub-
 nanogram quantities of 
 implanted solar wind, 
 returned cometary 
 material, dust in Antarctic 
 ice, etc.
    Analytic equipment: SIMS
 Secondary ion mass spectrometer
 Pros: Ideal for in situ analysis, quasi non-
 destructive, high spatial resolution, high mass 
 resolution, for some elements ppt detection 
 limits
 Cons: sample in ultra-high vacuum, requires 
 perfect surface for ppt analysis, matrix effects, 
 slow, and $
   Analytic equipment: ICP-MS
 Inductively coupled plasma mass spectrometer
 Pros: ppq detection limits, can work in situ or 
 analyze digests, samples at atmospheric P, 
 matrix insensitive, fast, relatively inexpensive
 Cons: destructive, requires more material than 
 SIMS, prone to blank contamination during 
 sample preparation, may require elemental pre-
 concentration
     Solution ICP-MS
        Instrumental limits: ICP-MS
  Sensitivity:                 450,000 cps ppb-1
  Detection limit:             1 cps
  Consumed mass:               2 grams
  Absolute mass of detected material: 4-5 
  femtograms (10-15g)
  Dilution factor (solution/solid ratio): 1,000
  Hence in 2 g of solution, only 2 mg of solid 
  translates to minimum detectable concentration 
                        -1
  of 4-5 nanograms g  (ppt)
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...Drivers behind geo and cosmochemical analysis desire to analyze sub nanogram quantities of implanted solar wind returned cometary material dust in antarctic ice etc analytic equipment sims secondary ion mass spectrometer pros ideal for situ quasi non destructive high spatial resolution some elements ppt detection limits cons sample ultra vacuum requires perfect surface matrix effects slow icp ms inductively coupled plasma ppq can work or digests samples at atmospheric p insensitive fast relatively inexpensive more than prone blank contamination during preparation may require elemental pre concentration solution instrumental sensitivity cps ppb limit consumed grams absolute detected femtograms g dilution factor solid ratio hence only mg translates minimum detectable nanograms...

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