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Electron ionization
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==== Analysis of archaeologic materials ==== The GC-EI-MS has been used for the study and characterization of organic material present in coatings on Roman and Egyptian [[amphora]]e. From this analysis scientists found that the material used to waterproof the amphorae was a particular type of resin not native to the archaeological site but imported from another region. One disadvantage of this method was the long analysis time and requirement of wet chemical pre-treatment.<ref name=":1" />
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