Site Four: Purple Group






PURPLE GROUP 






On the banks of the Little River, which runs through the Alewife Reservation, it runs right next to a road, which may be the cause for most of the trash, and excess salt and bacteria, which resides in the fecal contaminated murk of the water. There is also construction happening on other side of the Little River and is polluting the water with salt, and dirt, and dead organisms. The ground is dry, and many road-adapting plants grow next to the river, as well as some trees you may be able to see assorted mosses, leaves, weeds, Japanese Knotweed, a Toothed Aspen, a regular Aspen, a Red Maple, a Common Tansy. 



Data Trends

Looking briefly at the data for the nitrogen compounds we have been testing, there does not seem to be any visible trend or pattern. The Ammonia levels have constantly been positive in our visits, which is a sign of the human runoff and animal waste that the water is exposed to. Although it has gotten significantly lower after the first test procuring levels of two PPM, then to 0.5, 1.5, 1.0, and 0.15. We find it slightly odd that the first test, along with several others, had such high ammonia levels with zero in nitrate and/or nitrite. The nitrite test results are as follows: 0, 0.25, 5.0, 0, and 0 (PPM). The nitrate: 0, 0, 0.5, 10, and 5.0. Something that immediately stands out to us in this data set is the sudden flare up of nitrate levels, ten and five. Both of these numbers correspond with levels of zero in nitrite, and one and 0.15 in ammonia. Looking at a different parameter, we see that the higher levels of dissolved oxygen, nine and ten, correlate with the higher levels of ammonia. Overall, the major component in the varying levels of ammonia as well as nitrite and nitrate would be environmental fluctuations. Each day we have collected samples there has been vastly different conditions in terms of weather. The beginning of our testing was primarily in the winter, when there was many more chemicals around the water such as sidewalk salt. The snow and rain that fluctuated throughout the span of weeks certainly could have held chemicals that would have affected nitrogen compound levels. A question we would like to look more into would be how the changes in weather affect all of the water quality parameters and how this affects the nitrogen compounds specifically. In our latest test results for nitrate, there was a particularly high spike, going towards 20 PPM. Before this our highest result for nitrate was around ten PPM. This is believable due to the sudden spike in plant growth on the banks of the water. As to where the nitrate is coming from, we do not have a definite answer, only guessing it could possibly be coming from people’s fertilizer as spring is now upon us.


Who does what testing?!

Nitrogen Compounds: Erin Thomas

PH: Ahlam 

Animals: Lila, Mia 

Temperature: Lila 

Turbidity: Mia 

Plants: Adam 

Salinity: Adam

Dissolved Oxygen and B.O.D: Danny