grab sample
- noun
- /ɡræb ˈsæmpl/
- Specialized
:
muestra instantánea
- Grab samples have more limited accuracy, characterizing ATU performance at one point in time, than do samples collected over a longer period of time (e.g., 24 hours).
- collecting a grab sample
Examples
-
Where the quality and flow of the waste stream being sampled is not likely to change over time, a grab sample is appropriate and specified in the permit.
Academic text (1997) -
Compost samples were collected weekly throughout the composting period by opening the sampling door on the cover and collecting a grab sample.
Academic text (1995) -
Five grab samples were taken at each station on each sampling date.
Academic text (2002) -
Chlorinated samples were not available when other grab samples were collected.
Academic text (2005) -
A second smaller grab sample was used for gravimetric measurement of moisture content.
Academic text (1995) -
Software allows immediate transfer from grab samples to full, online analysis with complete reporting and graphing capability.
Academic text (1997) -
Influent and effluent were taken by grab samples and placed in clean, unused, plastic milk containers.
Academic text (1998) -
The accuracy of grab samples, however, is sufficiently acceptable for the method to be used routinely by regulatory agencies to monitor and evaluate ATU performance in the field.
Academic text (2003) -
The grab samples were then extensively analyzed in FSC laboratories by using quantitative gas chromatography-mass spectrometry (GC-MS).
Academic text (1998) -
The technician collected a grab sample to assess the water quality at the site.
Synonyms
∞
2.3
A small part taken from something to test or study
Antonyms
How Representative
121
2.7
- Specialized
1
5.9
- Specialized
4
4.4
- Specialized
Surface Forms
Morphology
The meaning 'a single sample taken at a specific point in time' is directly derivable from combining 'grab' (to seize or take quickly) with 'sample' (a portion for analysis): a sample that is taken (grabbed) at one moment. Although it's a technical collocation in scientific contexts, the composition is literal and follows normal English patterns, so a B1 learner who knows the words would likely infer the meaning.
Etymology
The noun grab sample comes from the image of someone using a quick grab to take a small sample of water or air with a bottle to check how things are at that moment. So a grab sample means 'a single measurement taken at one time' to show immediate conditions.