Question

Which of the following is a better test to identify Coliforms?

(a) Coliform index

(b) Multiple tube fermentation

(c) MPN test

(d) Membrane filter technique

I have been asked this question by my school teacher while I was bunking the class.

My enquiry is from Biological Characteristic of Water topic in division Quality of Water of Environmental Engineering

Answer 1

The correct answer is (d) Membrane filter technique

For explanation: Membrane filter technique is a better and simpler technique to identify Coliforms. Various results are obtained in a shorter time than the multiple tube fermentation technique. MPN test and coliform index are not used now.