بررسي قابليت جايگزيني روش PRESENCE ABSENCE TEST با روش تخمير 5 لوله اي در آزمون احتمالي باكتريولوژيك شبكه توزيع آب مشروب

Comparing the Feasibility of Presence Absence Test with Multiple Tube Fermentation Technique in the Bacteriological Examination of Water Distribution Network

Performing the bacteriological tests for potable water is based on research , counting and discrimination of water pollution index (Coliform) . In these methods doing the tests needs some preparation before sampling , during sampling and during transporting the samples to laboratory as well as during preparation of cultivation environment. The above mentioned tasks require much equipment and different stages of cultivation . In this project , the Presence-Absence method (P-A ), which examines the presence or absence of pollution index in water is compared to the multiple fermentation technique , which is being used in laboratories all around the country at present, also the replacement of method is evaluated . This project was performed during 3 months and 263 samples were examined by both methods . The results demonstrate 7.01% more sensitivity for P-A method to the other . Comparing quality and quantity of the two methods confirms more benefits for P-A method .