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| Disadvantages
of Electron Impact sources: |
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| (1) The need to volatilize the sample limits
this |
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| method since it
excludes analysis of thermally |
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| unstable compounds. |
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| (2) Excessive fragmentation can lead to the |
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| disappearance of
the molecular ion peak |
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| therefore
preventing the molecular mass of |
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| the analyte to be
determined. |
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