Ultra-high purity ICP-MS. BALZ S. KAMBER Laurentian University. www.chemicalfingerprinting.laurentian.ca. Drivers behind geo- and cosmochemical analysis. Desire to analyze sub-nanogram quantities of implanted solar wind, returned cometary material, dust in Antarctic ice, etc.
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BALZ S. KAMBER
Desire to analyze sub-nanogram quantities of implanted solar wind, returned cometary material, dust in Antarctic ice, etc.
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 $
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
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 of 4-5 nanograms g-1 (ppt)
Chip results sub 10 mg samples