Water samples collected at a sampling point at a depth and a specific time defined. The sample is representative of the composition of the water at that point in time. But if they know that the elements consist of a relatively constant water so we may simply assumes that the sample we collected them as representative of the entire region. Normal enough water samples for analysis of various parameters in the operating room, but if water sample collection device is smaller and requires analysis of multiple parameters, it can collect samples twice and then mixed together to provide sufficient analysis. This kind of sampling suitable for water sources that have properties not change much or for drainage, that does not permit well.
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