Grab Sample

Definition - What does Grab Sample mean?

A grab sample refers to a small representative subset of a larger quantity, concentration or measurement that is taken at a specific time. Grab samples of air and water environments are often tested to determine the degree of corrosion that may be experienced by metals in the vicinity.

Corrosionpedia explains Grab Sample

Grab samples have certain limitations. These include:

  • They serve only as a snapshot of the water or air at a specific point in time. Therefore, they may not be entirely representative of the typical operating concentrations.
  • They are most appropriate for small operating facilities with low flow rates.
  • They are most appropriate for small operating facilities with a regular substantial amount of staff for continuous sample monitoring.

Grab samples are used to measure the concentration of the following substance properties:

  • pH
  • Dissolved oxygen
  • Total residual chlorine
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