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Heavy Metals

Metals such as Zinc, Chromium, Manganese and Lead are introduced to various aquatic systems, like the Paramecium Pond.  The Paramecium Pond is part of this system in an urban setting. Therefore, large amounts of pollutants accumulate at the surface of streets and roofs. Ultimately, they are carried towards and end up being part of the pond. With regards to these sediment, more is found closer to the inlet compared to the outlet.  The metals that we have selected to look at for this project are Zinc, Chromium, Lead, and Manganese. These are all considered heavy metals (because they all have an atomic number great than 20). According to a study done on ‘ Heavy metal concentrations and toxicity in water and sediment from stormwater ponds and sedimentation tanks,’ the concentration of metals were the highest in ponds. This is important when considering how these metals affect the sediment in Paramecium Pond. Looking at the actual results, it is surprising to see Manganese ha...
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Analysis

Analysis The Graph shows that the mean concentration for each heavy metal considered in the graph is greater when the depth is less. Therefore, at a depth of 0-50 cm the concentration is, on average, higher. This makes sense because the metals enter the pond as a result of external, surrounding factors. They may continue to float at the top of the pond before possibly going off into the silver stream. This results in the surface of the pond to have a greater concentration of the heavy metal sediments. Additionally, the water goes through the outer drain and ultimately enters Lake Waban. This could mean that the sediment at the bottom of Paramecium Pond could travel towards Lake Waban. This would essentially decrease the concentration of the heavy metals at a greater depths.
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