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  Section: Practical Skills in Chemistry » Instrumental techniques
 
 
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Detectors

 
     
 
Content
Instrumental techniques
  Basic spectroscopy
    Introduction to spectroscopy
    UV Ivisible spectrophotometry
    Fluorescence
    Fluorescence spectrophotometry
    Phosphorescence and luminescence
    Atomic spectroscopy
  Atomic spectroscopy
    Atomic Absorption Spectroscopy
    Atomic Emission Spectroscopy
    Inductively coupled plasma
    Decomposition techniques for solid inorganic samples
  Infrared spectroscopy
  Nuclear magnetic resonance spectrometry
    1H-NMR spectra
    13C-NMR spectra
  Mass spectrometry
    Interfacing mass spectrometry
  Chromatography ~ introduction
    The chromatogram
    Resolution
    Detectors
  Gas and liquid chromatography
    Gas chromatography
    Liquid chromatography
    High-performance liquid chromatography
    Interpreting chromatograms
    Optimizing chromatographic separations
    Quantitative analysis
  Electrophoresis
    The supporting medium
    Capillary electrophoresis
    Capillary zone electrophoresis (CZE)
    Micellar electrokinetic chromatography (MEKC)
  Electroanalytical techniques
    Potentiometry and ion-selective electrodes
    Voltammetric methods
    Oxygen electrodes
    Coulometric methods
    Cyclic voltammetry
  Radioactive isotopes and their uses
    Radioactive decay
    Measuring radioactivity
    Chemical applications for radioactive isotopes
    Working practices when using radioactive isotopes
  Thermal analysis
    Thermogravimetry
    Applications

After separating the components of the mixture it is necessary to detect them. As chromatography is often used as a quantitative technique it is essential to be familiar with the following terms:
  • Universal detector: this responds to all compounds eluting from the column, irrespective of their composition.

  • Selective/specific detector: this responds to certain elements or functional groups. This is a useful approach if the components of the mixture are known.

  • Sensitivity: the ratio of detector signal to sample size (or detector response per amount of sample).

  • Minimum detectable level (MDL): the amount of sample in which the peak height is at least twice the noise height.

  • Linear dynamic range: the concentration range of the sample that is detectable and where the detector response is linear (between the MDL and detector saturation).

 
     
 
 
     



     
 
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