TEAM+B

By: Donna Khatami, Isaura Garcia, Michielini

Hypothesis Statement: The purpose of the pond water filtration lab was to see if once the water is filtrated through first the gravel and sand, then the iodine, finally through charcoal to see whether the water will be safe to drink or not. Once the filtrated pond water is put onto agar we can determine over time if bacteria is still present. The water will not be fully safe to drink because there will still be bacteria not visible to the plain eye.

A Procedure: Step 1-First put about a inch of gravel in a cup then about a inch of sand on top of the gravel. At the bottom of the cup there must be holes so when the pond water is put into the cup it will filter out, this will get rid of all of the big particles in the water, after all the water is filtered out, there was 150mL. Step 2-Then proceed to to put 10mL of iodine into the already filtered water. The iodine solution is 3.33g/L. Step 3- After the iodine is fully mixed throughout the water put a tsp of charcoal into the water, then mix it and then poured it into a funnel with filter paper, the water will then come out clear and will seem to be clean. Then put the filtered water into agar and let it incubate over a period of 3 days.

 sand filter liquid iodine water/charcoal mixture

 filtering charcoal

First day: Filtered Pond Water Pond Water

After 3 day incubation: Filtered Pond Water Pond Water