The purpose of this experiment was to determine which disinfectant would most effectively kill bacteria.
I became interested in this idea when I was washing the counter and I wondered if the disinfectant I was using was better than another was.
The information gained from this experiment would help parents, health
care providers, and food preparers to know which disinfectant to use to
the best results for killing bacteria.
My hypothesis was that bleach would work the best in killing the bacteria.
I based my hypothesis on Marie Clark, Microbiologist at Memorial Hospital,
who said, "Bleach will probably work the best because it is an oxidant."
The constants in this study were:
The responding variable was how many bacteria were killed by the disinfectant after one night of incubation.
To measure the responding variable the percentage of surviving colonies
1. Culture several species of bacteria including:
The original purpose of this experiment was to determine which disinfectant would most effectively kill bacteria.
The results of the experiment were that bleach worked the most effectively
to kill bacteria.
My hypothesis was that bleach would work most effectively to kill the most bacteria.
The results indicate that this hypothesis should be accepted.
Because of the results of this experiment, I wonder if bleach would still work the best if there were different types of bacteria used. I also wonder if there would be different results if I tested more disinfectants for the experiment. I also wonder if one half or one tenth as much disinfectant would show similar results.
If I were to conduct this project again, I would test more brands of
disinfectants for the experiment. I would also use more types of bacteria,
and I would do more than one trial for the each test to obtain more accurate
results and to get an average.
I would like to thank the following people:
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