Sub-topic #1: Gravimetric Methods

• What is gravimetry?


  It is the measurement of mass or change in mass to provide quantitative information about the analyte.
• What does the choice of gravimetric methods depend on?

  It depends on the technique involved in measuring the mass.
• What are the four types of gravimetric methods mentioned?

  1. Particulate Gravimetry
  2. Electrogravimetry
  3. Precipitation Gravimetry
  4. Volatilization Gravimetry
• When is particulate gravimetry used?


  It is used when the analyte is already present in a separable form from the matrix.
• What is required in electrogravimetry?


  It requires the deposition of the analyte on an electrode in an electrochemical cell.
• What is the process of deposition in electrogravimetry?


  It is the direct transition of a substance from its gaseous form into a solid state.
• How does precipitation gravimetry work?


  The analyte is converted into an insoluble form and then directly weighed.
• What does volatilization gravimetry use to remove volatile species?


  It uses thermal or chemical energy.
• For what purpose is volatilization gravimetry often used in food samples?

  It is used as an indirect way of determining the moisture content.