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  Coliformes totaux dans ...  
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FMT
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HPC
  Escherichia coli dans l...  
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, on indique un intervalle de confiance de 95 % pour les résultats obtenus par FMT (APHA et coll., 2005). Les études réalisées sur l'efficacité des tests commerciaux comparativement aux méthodes FMT et FM classiques ont montré que les trousses commerciales étaient généralement aussi sensibles que la méthode FMT pour la détection d'
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High turbidity can also interfere with the MF method. The retention of particulate matter by the filter can interfere with colony development and the production of surface sheens and/or fluorescence by presumptive coliforms or
  Escherichia coli dans l...  
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, on indique un intervalle de confiance de 95 % pour les résultats obtenus par FMT (APHA et coll., 2005). Les études réalisées sur l'efficacité des tests commerciaux comparativement aux méthodes FMT et FM classiques ont montré que les trousses commerciales étaient généralement aussi sensibles que la méthode FMT pour la détection d'
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High turbidity can also interfere with the MF method. The retention of particulate matter by the filter can interfere with colony development and the production of surface sheens and/or fluorescence by presumptive coliforms or
  Escherichia coli dans l...  
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, on indique un intervalle de confiance de 95 % pour les résultats obtenus par FMT (APHA et coll., 2005). Les études réalisées sur l'efficacité des tests commerciaux comparativement aux méthodes FMT et FM classiques ont montré que les trousses commerciales étaient généralement aussi sensibles que la méthode FMT pour la détection d'
Compare text pagesCompare HTM pagesOpen source URLOpen target URLDefine hc-sc.gc.ca as primary domain
High turbidity can also interfere with the MF method. The retention of particulate matter by the filter can interfere with colony development and the production of surface sheens and/or fluorescence by presumptive coliforms or
  Coliformes totaux dans ...  
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Lors de l'utilisation des milieux à base de lactose pour le test P A ou la méthode FMT, la formation d'acide et/ou de gaz, après une incubation à 35 °C pouvant atteindre 24 heures, constitue un résultat positif indiquant la présence présumée de coliformes totaux.
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In disinfected residential-scale systems, total coliforms are considered operational indicators. Their presence provides evidence of the inadequacy of disinfection or deterioration of water quality in the system. The presence of total coliforms in non-disinfected wells indicates that the well is either prone to surface water infiltration and therefore at risk of faecal contamination, or that bacterial regrowth is occurring within the well or plumbing system (if the sample is not taken directly from the well). Implementation of corrective actions, such as shock-chlorination and flushing, provides valuable information on the source of the total coliform bacteria. Microbial regrowth problems should be solved after these actions have been taken. The continued presence of total coliforms after shock-chlorination is probably the result of infiltration, indicating that the system is vulnerable to contamination with pathogenic microorganisms. The extent of the contamination (e.g., how many samples tested positive and the locations where they were collected) can also be used to aid in determining the cause of the contamination, interim protective measures, and the necessary corrective actions. Examples of corrective actions are outlined in section 3.2.
  Les coliformes totaux -...  
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Au Canada, on utilise actuellement trois méthodes différentes pour détecter de façon régulière la présence de coliformes totaux dans l'eau : la méthode présence-absence (P-A), la filtration sur membrane (FM) et la fermentation multitube (FMT).
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As noted above, non-coliform bacteria may interfere with the recovery of coliforms when using a lactose-based medium. Data from the U.S. National Community Supply Survey (Geldreich
  Escherichia coli - Reco...  
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dans l'eau : la méthode présence-absence (P-A), qui est une méthode qualitative, ainsi que la filtration sur membrane (FM) et la fermentation multitube (FMT), qui sont des méthodes quantitatives. La 20e édition de
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., 1986; Clark and El-Shaarawi, 1993), and it required a similar amount of time to obtain results. Technically, the P-A test is simpler than the MF and MTF procedures. Initial per-sample analysis time is less than 1 minute, and, since the allowable level of
  Escherichia coli - Reco...  
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de l'Organisation mondiale de la santé, on recommande, dans le cas d'une eau qui devrait être de bonne qualité, une série d'échantillons comprenant un volume de 50 ml et 5 volumes de 10 ml pour la méthode FMT (OMS, 1971).
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testing is impractical (e.g., in small supplies), residual disinfectant determinations should be relied upon to verify microbiological safety. Small supplies should also periodically carry out sanitary surveys as an additional action to verify the safety of the system. The daily sampling recommendations for disinfectant residual and turbidity testing do not apply to supplies served by groundwater sources of excellent quality in which disinfection is practised to increase the safety margin. In a distribution system, the number of samples for bacteriological testing should be increased in accordance with the size of the population served. However, it is recommended that, regardless of the population being served, a minimum of four samples per month should be examined. Table 1 is offered as a guide.
  Escherichia coli - Reco...  
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de l'Organisation mondiale de la santé, on recommande, dans le cas d'une eau qui devrait être de bonne qualité, une série d'échantillons comprenant un volume de 50 ml et 5 volumes de 10 ml pour la méthode FMT (OMS, 1971).
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testing is impractical (e.g., in small supplies), residual disinfectant determinations should be relied upon to verify microbiological safety. Small supplies should also periodically carry out sanitary surveys as an additional action to verify the safety of the system. The daily sampling recommendations for disinfectant residual and turbidity testing do not apply to supplies served by groundwater sources of excellent quality in which disinfection is practised to increase the safety margin. In a distribution system, the number of samples for bacteriological testing should be increased in accordance with the size of the population served. However, it is recommended that, regardless of the population being served, a minimum of four samples per month should be examined. Table 1 is offered as a guide.
  Les coliformes totaux -...  
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Lorsqu'on utilise des milieux à base de lactose pour le test P-A ou la méthode FMT, la formation d'acide ou de gaz après une incubation pouvant atteindre 24 heures à 35 °C constitue un résultat positif indiquant la présence présumée de coliformes totaux.
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sp., in contrast, were not inhibitory, even at concentrations above 1000 CFU/mL. Standridge and Sonzogni (1988) evaluated two modifications of the MF technique for total coliforms in drinking water containing high background counts. In both cases, roughly 8% of the plates originally classified as coliform negative but overgrown -- i.e., confluent growth or more than 100 background CFU/100 mL -- yielded coliforms. It should be noted that most water supplies maintaining a total chlorine residual of 0.2 mg/L have an HPC below 500 CFU/mL. Historically, some jurisdictions used background colony counts on total coliform membrane filters as a convenient and inexpensive surrogate for HPC. Background colony counts should no longer be used as a surrogate for HPC testing, but they can be used for determining if heterotrophic bacteria are present at levels that may interfere with coliform recovery. Further information on HPC and background colony counts, along with their significance in drinking water, can be found in