بررسی قابلیت جایگزینی روش Presence Absence Test با روش تخمیر 5 لوله ای در آزمون احتمالی باکتریولوژیک شبکه توزیع آب مشروب

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  .