Sampling counter and mixed together by collecting from the same spot, but the time difference is the average concentration of the sample at the point of collection. At one time, which according to the standard, commonly used storage time 24 hours and considered examples include this represent a reservoir. Sampling mixed this often use water samples with chemical and physical condition is not constant in each period. Due to activities such as bath from industrial water treatment system of waste water And water left from buildings, etc.
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