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Chemistry LibreTexts

1: Elemental Analysis

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  • The purpose of elemental analysis is to determine the quantity of a particular element within a molecule or material.

    • 1.1: Introduction to Elemental Analysis
      Elemental analysis can be subdivided in two ways: Qualitative: determining what elements are present or the presence of a particular element. Quantitative: determining how much of a particular or each element is present. In either case elemental analysis is independent of structure unit or functional group.
    • 1.2: Spot Tests
      Spot tests  are simple chemical procedures that uniquely identify a substance. They can be performed on small samples, even microscopic samples of matter with no preliminary separation. The first report of a spot test Hugo Shiff for the detection of uric acid. In a typical spot test, a drop of chemical reagent is added to a drop of an unknown mixture. If the substance under study is present, it produces a chemical reaction characterized by one or more unique observables, e.g., a color change.
    • 1.3: Introduction to Combustion Analysis
      Combustion analysis is a standard method of determining a chemical formula of a substance that contains hydrogen and carbon. First, a sample is weighed and then burned in a furnace in the presence of excess oxygen. All of the carbon is converted to carbon dioxide, and the hydrogen is converted to water in this way. Each of these are absorbed in separate compartments, which are weighed before and after the reaction. From these measurements, the chemical formula can be determined.
    • 1.4: Introduction to Atomic Absorption Spectroscopy
      There are many applications of atomic absorption spectroscopy (AAS) due to its specificity. These can be divided into the broad categories of biological analysis, environmental and marine analysis, and geological analysis.
    • 1.5: ICP-AES Analysis of Nanoparticles
      ICP-AES is a spectral technique that is used to both determine the presence of metal analyte and the concentrations thereof. The ICP-AES method is introduced and a practical example is presented. This will help the reader to use this method for their own research work.
    • 1.6: ICP-MS for Trace Metal Analysis
      Inductively coupled plasma mass spectroscopy (ICP-MS) is an analytical technique for determining trace multi-elemental and isotopic concentrations in liquid, solid, or gaseous samples. It combines an ion-generating argon plasma source with the sensitive detection limit of mass spectrometry detection. Although ICP-MS is used for many different types of elemental analysis, including pharmaceutical testing and reagent manufacturing, this module will focus on mineral and water studies.
    • 1.7: Ion Selective Electrode Analysis
      Ion selective electrode (ISE) is an analytical technique used to determine the activity of ions in aqueous solution by measuring the electrical potential. ISE has many advantages compared to other techniques. Based on these advantages, ISE has wide variety of applications, which is reasonable considering the importance of measuring ion activity.
    • 1.8: A Practical Introduction to X-ray Absorption Spectroscopy
      X-ray absorption spectroscopy is a technique that uses synchrotron radiation to provide information about the electronic, structural, and magnetic properties of certain elements in materials. This information is obtained when X-rays are absorbed by an atom at energies near and above the core level binding energies of that atom. Therefore, a brief description about X-rays, synchrotron radiation and X-ray absorption is provided prior to a description of sample preparation for powdered materials.
    • 1.9: Neutron Activation Analysis (NAA)
      Neutron activation analysis (NAA) is a non-destructive analytical method commonly used to determine the identities and concentrations of elements within a variety of materials. Unlike many other analytical techniques, NAA is based on nuclear rather than electronic transitions. In NAA, samples are subjected to neutron radiation (i.e., bombarded with neutrons), which causes the elements in the sample to capture free neutrons and form radioactive isotopes.
    • 1.10: Total Carbon Analysis
      An introductory module to the theory and application of Carbon Analysis: discusses techniques used to measure Total Organic Carbon, Total Inorganic Carbon, and Total Carbon, and the importance of such techniques.
    • 1.11: Fluorescence Spectroscopy
    • 1.12: An Introduction to Energy Dispersive X-ray Spectroscopy
    • 1.13: X-ray Photoelectron Spectroscopy
    • 1.14: Auger Electron Spectroscopy
    • 1.15: Rutherford Backscattering of Thin Films
    • 1.16: An Accuracy Assessment of the Refinement of Crystallographic Positional Metal Disorder in Molecular Solid Solutions
    • 1.17: Principles of Gamma-ray Spectroscopy and Applications in Nuclear Forensics