Comparison of Enzymatic Assay and Multiple Tube Fermentation Technique in the Assessment of Microbial Quality of the Karoon River


1 Assist. Prof. of Environmental Health, Faculty of Public Health, Isfahan University of Medical Sciences, Isfahan

2 M. Sc. of Environmental Health, Public Health Center, Yasooj

3 Assoc. Prof., Dept. of Nutrition Isfahan Uvinversity of Medical Sciences, Isfahan

4 Instructor of Statistics, Academic Member of Public Health, Isfahan University of Medical Sciences, Isfahan


Microbiological monitoring of surface waters designated for use as drinking water is essential by water utilities for the design and operation of drinking water treatment plants. Enzymatic assays have been applied as a rapid alternative approach to assess the microbiological quality of freshwater. In this study, the LMX broth (LMX) as an enzymatic assay was compared with the standard method of multiple tube fermentation technique (MTF) for the microbial monitoring of the Karoon River. Enumeration of total coliforms and E. coli averaged 9928 and 6684 MPN/ 100 ml by the LMX and 7564 and 6546 MPN/ 100 ml for the MTF, respectively. This difference was statistically significant for TC but the overall analysis revealed no difference between E. coli recoveries on LMX and MTF. In conclusion, LMX can be used for the enumeration of coliforms and E. coli in surface waters as it is less lobar-intensive, yields faster result, and simultaneously detects both total coliforms and E. coli.


آب و فاضلاب                                                                                                                                                                      شماره 3 سال 1389
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