Praxis 5005 Practice Test Practice Question
Which of the following is most important to achieving an accurate result when performing a coliform test on water samples?
Correct Answer: B
Rationale: Achieving accurate results in a coliform test hinges on the proper sterilization of equipment. Contaminated tools can introduce foreign bacteria, leading to false positives or negatives.
Option A, boiling samples, is unnecessary and could kill the coliform bacteria needed for testing. Option C, using samples over 24 hours old, could result in changes in bacterial populations, skewing results. Option D, collecting samples from moving water, is irrelevant; coliforms can be present in both stagnant and flowing water. Proper sterilization ensures that the test reflects the true presence of coliforms in the sample.
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