This powerpoint presentation begins by providing background information on:
coliform bacteria, water quality and safety;
E. coli and coliforms, indicators of potential faecal contamination; absence of indicator bacteria, does not guarantee absence of pathogens; and,
eight commonly used methods in Australian water testing
laboratories for the detection of coliform bacteria. The objective of this study was to evaluate the eight enumeration methods routinely used in water
testing laboratories for the detection of coliform bacteria in water
samples using a precise number of bacteria. Materials and methods included:
BioBall™ vials containing freeze-dried E. coli and E. aerogenes
cultures; testing
all methods 10 times with each BioBall™ culture; the mean and standard deviation of all readings was calculated; and,
three different batches of BioBall™ were used. Conclusions were that:
for methods enumerating 1 ml samples (Petrifilm and SPC), Petrifilm
and PCA-P produced the most accurate and consistent results;
for methods enumerating 100 ml samples (MF, DST and MPN),
Colilert™ produced the most consistent results;
MF, Colisure™ and MPN produced results with greater variability than
first expected; and,
BioBall™ is a very suitable quality control for evaluating the efficiency
of water testing procedures. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 26 |
| Published : | 11/01/2007 |
