Water samples collected at the point of collection, for example, depth and a certain time. The sample will be representative of the water element, the only point in time. But if you know that the flood of elements are fairly constant. Normally, for example, water that is enough storage for various parameters for analysis in the laboratory, but if water sample collection device is smaller and requires analysis of multiple parameters, it can be stored, for example 2. This sample collection suitable for water bodies that do not change much or for wastewater that does not flow: fresh.
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