FIU CHM 4130 - CHAPTER 11_Xiao_Atomic Mass Spectrometry_2018 (123 pages)

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CHAPTER 11_Xiao_Atomic Mass Spectrometry_2018



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Atomic Mass Spectrometry Nearly all elements in the periodic table can be determined by mass spectrometry More selective and sensitive than optical instruments Simple spectra Isotope ratios Much more expensive instrumentation An Overview of Elemental Analysis via Atomic Spectroscopy Atomic spectrometry systems 1 5 Figure 1 3 Atomic spectrometry systems containing free atoms and ions of the element of interest Figure 1 3 shows the instrumental arrangements for four different techniques used to detect these atoms or ions sorts the radiation by wavelength The radiation is detected and turned into electronic signals that are converted into concentration information for the analyst A representation of the layout of a typical ICP OES instrument is shown in Figure 3 1 ICP OES Instrument ICP Quadrupole Mass Analyzer The four main components of a Atomic mass spectrometer All ions Selected ions Detector Inlet Ionization Source Ion Accelerator Mass Analyzer Lets talk about mass Atomic mass of Carbon Atomic mass of Chlorine Atomic mass of Hydrogen Lets talk about mass Atomic mass of Carbon 12 000000000000000000000000000 amu Atomic mass of Chlorine 35 4527 amu Atomic mass of Hydrogen 1 00794 amu 1amu atomic mass units 1 dalton Da What about isotopes Atomic mass of Carbon 12 000 amu for 12C but 13 3355 for 13C Atomic mass of Chlorine 34 9688 amu for 35Cl and 36 9659 for 37Cl Atomic mass of Hydrogen 1 00794 amu for H and 2 0141 for D Just for clarification Atomic mass amu atomic mass units Da or Dalton kD kiloDalton for macromolecules 1 amu 1 Da 1 66056 10 27 kg proton mp 1 67265 10 27 kg neutron mn 1 67495 10 27 kg Ways to define and calculate the mass of an atom molecule or ion Average mass calculated using the atomic weight which is the weighted average of the atomic masses of the different isotopes of each element in the molecule find it in periodic table Nominal mass calculated using the mass of the predominant isotopes of each element rounded to the nearest integer value



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