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Grab Sample

Last updated: August 16, 2019

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.

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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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Synonyms

Catch Sample, Individual Sample

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Tags

InspectionCorrosion TestingSubstancesProceduresMeasurementGeneral Procedures Water and WastewaterInspection / Monitoring

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