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  1. What is the benefit of Dispersive IR that use double beam (null type)
    • The null type elminates the flucturation of the source and detector.
    • Compensates for the internal scattering or interference caused by the solvent
  2. Which IR absorption spectroscopy is ideal for single gas quantitative analysis?
    IR non-dispersive
  3. Name the reducing agent that is used in Mercury Cold Vapour AAS.
    Stannous Chloride
  4. What are the limitations of AAS -> Atomic absorption Spectroscopy?
    • Elemental analysis only
    • Can only analyze one element at a time
    • When you want to do multiple elements, the lamp costs will add up
    • Lamps have life span - added cost to replace
    • Can take a long time (Graphite Furnace AAS)
    • Destructive Technique
  5. What are the advantages of Atomic Absorption spectroscopy?
    • Trace elements analysis - high specificity, speed, high sensitivity (esp. Graphite Furnace AAS) & moderate equipment cost
    • Interferences are usually controllable
  6. What are the benefits of AES-ICP?
    • Capable of determining most elements including non-metals down to ppb levels
    • wide detection range
    • relatively free from chemical interference
    • can determine 30+ elements at the same time
    • cost effective for multiple elements qualitative and quantitative analysis
  7. What are the disadvatage of AES-ICP?
    • Operator requires special skill and training
    • high capital cost
    • computerized data processing may be required to correct spectral interferences
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industrial hygiene
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