Estimation of Coliform Density by the Membrane Filter and the Fermentation Tube Methods

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Abstract
Statistical analyses of the results of 3 extensive investigations on a wide variety of natural waters comparing the MPN and MF techniques indicate that on the average the former gives higher indications of density by a factor of 1.1 to 2.0. This is not regarded as significant from a practical viewpoint because of the inherent lack of precision of the individual MPN value. A considerable part of this disparity is due to the fact that the MPN tends to over-estimate the true density. The precision of density estimates made from examining a single MF is from 2 to 5 times greater than that from a 5-5-5 tube MPN.

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