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Evaluation of Membrane Filter Technique for Appraising Ohio River Water Quality
Under commission authorization and staff direction, members of the Orsanco Water Users Committee, during the period November 1956‐November 1957, carried out a comparative study of the membrane filter and standard dilution methods of enumerating coliform organisms in raw waters taken from the Ohio River and two tributary rivers. Following completion of the 13‐ month period of comparative tests, the same group conducted a study of three different confirmatory MF media, in order to ascertain whether any improvement was obtainable over the one‐step HD medium that had been used throughout the 13‐month period of comparative tests. The first trial was the two‐step HD medium against the one‐step HD medium that had been previously used. This test continued for 5 months, from January through May 1958. An overall summary of the results revealed that the two‐step HD medium yielded an average of 20 per cent higher coliform counts than the one‐step HD medium. Meanwhile, interest had been aroused in a one‐step medium proposed by Fifield and Schaufus. Although only a limited time was available to test this medium, comparative tests against the two‐step HD medium, during June and July 1958, showed an average of 16 per cent higher counts than the two‐step medium – an encouraging result. It thus was indicated that substantially higher counts, amounting to nearly 40 per cent, were obtainable with the one‐step MF medium as compared to the one‐step HD medium. The conclusions drawn from this study, made by six laboratories over a period of about 20 months, were that the use of the membrane filter is an acceptable alternative method of enumerating coliform organisms in water, as compared to the standard dilution method, and is preferable because of its precision, speed, economy of space, and its freedom from statistical complications.
Evaluation of Membrane Filter Technique for Appraising Ohio River Water Quality
Under commission authorization and staff direction, members of the Orsanco Water Users Committee, during the period November 1956‐November 1957, carried out a comparative study of the membrane filter and standard dilution methods of enumerating coliform organisms in raw waters taken from the Ohio River and two tributary rivers. Following completion of the 13‐ month period of comparative tests, the same group conducted a study of three different confirmatory MF media, in order to ascertain whether any improvement was obtainable over the one‐step HD medium that had been used throughout the 13‐month period of comparative tests. The first trial was the two‐step HD medium against the one‐step HD medium that had been previously used. This test continued for 5 months, from January through May 1958. An overall summary of the results revealed that the two‐step HD medium yielded an average of 20 per cent higher coliform counts than the one‐step HD medium. Meanwhile, interest had been aroused in a one‐step medium proposed by Fifield and Schaufus. Although only a limited time was available to test this medium, comparative tests against the two‐step HD medium, during June and July 1958, showed an average of 16 per cent higher counts than the two‐step medium – an encouraging result. It thus was indicated that substantially higher counts, amounting to nearly 40 per cent, were obtainable with the one‐step MF medium as compared to the one‐step HD medium. The conclusions drawn from this study, made by six laboratories over a period of about 20 months, were that the use of the membrane filter is an acceptable alternative method of enumerating coliform organisms in water, as compared to the standard dilution method, and is preferable because of its precision, speed, economy of space, and its freedom from statistical complications.
Evaluation of Membrane Filter Technique for Appraising Ohio River Water Quality
Streeter, Harold W. (author) / Robertson, David A. Jr. (author)
Journal ‐ American Water Works Association ; 52 ; 229-246
1960-02-01
18 pages
Article (Journal)
Electronic Resource
English
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