Additives vs Pesticides Scifair Projects

Pesticides

Pesticides are used to control pests that impact agriculture and human life. While helpful, they can also be harmful.

Objectives/Goals

The objective of this experiment was to determine the contribution of water hyacinths in nutrient purification and to find the rate at which they reduced ammonium hydroxide (NH4OH) levels in water.

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Methods/Materials

Three control groups and one experimental group were used. Each group consisted of a certain combination of hyacinths, water, and aqua ammonia. NH4OH concentrations in the range 80-100 ppm were used in all trials. The reduction in NH4OH levels was measured daily by titrating using 0.008N sulfuric acid and a pH indicator.

Results

On average, NH4OH levels decreased rapidly in the experimental group during the three trials, implying that water hyacinths do reduce NH4OH levels, by about 5-15%, and the remaining 25% could be attributed to evaporation. These reductions occurred only during the first few days, after which both groups settled down to a constant level.

Conclusions/Discussion

The results indicate that irrespective of the initial concentration, an equilibrium point is reached after 3-5 days. It can be concluded that water hyacinths do affect purification, but evaporation and other chemical reactions seem to contribute more to nutrient reduction. This purification technique was also verified during spring to avoid plant dormancy. In future experiments, a more controlled environment is recommended to minimize evaporation and temperature affects. 3rd party contributor