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| When should I use to draw my samples? Automatic Sampler vs. Grab Sampling? |
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| Collecting samples of water is commonly required as for permit compliance and process control. Samples of influent, effluent, wells, sludge, and so forth are used for laboratory testing procedures. Collection of the samples can generally speaking be per performed in 2 ways: |
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- Grab sampling: Single, individual samples that are collected at a specific spot or site over a short time span (typically seconds or minutes) - as defined by Standard Methods for Water/Waste Water, and tested separately. Special grab samples can be taken when unexpected COD/BOD loads are being detected etc. or where an automatic sampler is impractical -Note: Some parameters require a grab sample; i.e. pH, chlorine, colifom, FOGs (Fats, Oils, Greases)
- Automatic Composite Sampling: specially designed devices that draw (pump) a specific volume of water into container over a period of time, independent of an operator.
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| 24 hour composite sampling (drawing a sample once an hour, every hour) is a common application. Unless the plant has 3 shifts, the only option is an automatic sampler. |
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| Regardless of the sampling process used, all samples are recommended to be tested as close to the time drawn as possible. Some parameters require analysis with specific time frames; i.e. BOD, coliform etc. |
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