Effects of Chlorine on Daphnia for Science Fair Projects

Chlorine: Toxic and Helpful?

Chlorine is a very helpful chemical, however, it can also be toxic in high concentrations. If you are interested in testing what chlorine can do to biological organisms at toxic levels then test it out on the daphnia. This project subject can be used to see if chlorine is a good pool pesticide as well as to see how it effects biology at toxic levels.

PURPOSE

The purpose of this experiment was to find out whether different concentrations of chlorine affect the survival rate of daphnia.

I became interested in this idea when I found out that you could see a microorganism's heart beating and experiment with them.

The information gained from this experiment could lead large companies, municipal water plants, and homeowners to learn that they are doing damage to the food chain. By polluting the environment with chlorine, you are killing daphnia, which feed the fish we eat.

HYPOTHESIS

My hypothesis is that as chlorine concentrations increase, the percent of daphnia survival will decrease.

I base my hypothesis on the fact that chlorine is dangerous to human beings. It is known to be fatal if swallowed or inhaled in concentrated amounts according to the manufacturers.

EXPERIMENT DESIGN

• The temperature of the water
• The amount of water
• The amount of daphnia tested
• The same kind of containers
• The same type of daphnia

MATERIALS

Science Fair Projects on Clorine continues here...