SECTION 1: LABORATORY 1-1 - National Park Service

Usually, the dilution series will consist of aliquots of 10ml, 1.0ml and 0.1ml. If all five of the 10ml tubes turn positive (presence of gas), three of the 1.0ml tubes, and one of the 0.1ml tubes are positive, this is reported as 5-3-1. This gives a MPN value of 110 from the chart. ................
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