Analytical Chemistry Ch.1

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Mattyj1388
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233016
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Analytical Chemistry Ch.1
Updated:
2013-09-05 14:05:34
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chem analytical process
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general terms, definitions, information. Ch. 1 Using Quantitative Chemical Analysis (Eighth Edition) by: Daniel C. Harris
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  1. Sampling
    The first step in any chemical analysis is procuring a representative sample to measure.
  2. Homogeneous
    Same composition everywhere (doesn't matter where you take the sample from).
  3. Heterogeneous
    One whose composition differs from place to place.
  4. Decant
    to pour off (typically leaving behind a solvent or other denser material).
  5. Analyte
    A chemical substance that is the subject of chemical analysis.
  6. Quantitative transfer
    A complete transfer.
  7. Slurry
    A suspension of solid in a liquid.
  8. Supernatant liquid
    Liquid above the packed solid.
  9. Sample preparation
    transforming a sample into a state that is suitable for analysis (at times a tedious procedure).
  10. Qualitative analysis
    Identifying what is in an unknown.
  11. Quantitative analysis
    is how much is present.
  12. Calibration curve
    (Also called a standard curve) A graph of detector response as a function of analyte concentration.
  13. Standard solutions
    Are when known concentrations of pure substance are prepared and injected into the column, and the resulting peak is measured.
  14. Aliquots
    (Portions). The purpose of replica measurements (repeated measurements) is to assess the variability (uncertainty) in the analysis and to guard against a gross error in the analysis of a single aliquot (part).
  15. Random heterogeneous material
    differences in composition occur randomly and on a fine scale.
  16. Random Sample
    is collected by taking portions from the desired number of segments chosen at random.
  17. Segregated heterogeneous material
    large regions have obviously different compositions. Here a representative composite sample must be constructed.

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