Tap bottled rain creek 5 10 15 20 25 30 35 figure 1

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Tap Bottled Rain Creek 0 5 10 15 20 25 30 35 Figure 1. Class Average Measured NO3- & PO43- across Four Water Samples Class Average NO3- Class Average PO43- Four Types of Water NO3- & PO43- (ppm) Figure 1 compares the contents of nitrate and phosphate contained in four water samples. As the chart shown, there were about 19ppm phosphates in creek water, which more than double how many nitrates creek water had. Bottled water and rain water contained more phosphates than nitrates as well. At the same time, more nitrates were measured in tap water. 5
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Discussion The objectives of this experiment were met. Four types of water quality were tested. The results were not very precise, but it could show the general trend. The bottled water from Dasani proved to be the most acidic, whilst tap water was the most basic. Meanwhile, tap water contained the highest level of nitrate and phosphate. This lab disconfirmed all of my hypothesis. I expected that bottled water should be the most basic water, and rain water should be the most acidic one. However, the most acidic one is bottled water while the most basic one is tap water. From ingredients charts of Dasani water, it contains many minerals and additives like magnesium sulfate and potassium chloride, which make the water less purified. If the water not very pure, the pH may be significantly higher or lower (Merritt, 2017 ). Meanwhile, tap water is the most basic since it contains alkali salt chloramine. According to Waterloo Water Quality Quiz video, Chloramine is a combination of chlorine and a small amount of ammonia. Chloramines are weaker disinfectants than chlorine but are more stable and long-lasting. This ensures safe water to the far ends of our distribution system and chlorinated water reduces any noticeable chlorine taste and smell ( Waterloo Water Quality Quiz, 2018). It was also my hypothesis that creek water would have the highest level of nitrate and phosphate. Nevertheless, the fact was that the tap water sample contains the highest level of nitrate and phosphate. Phosphate could effectively prevent any lead 6
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entering the water supply, which can come from the corrosion of old piping, so phosphate is routinely added to drinking water. Lead is a toxic metal and adding phosphate has proven to be very successful in reducing human exposure to it ( Lancaster University, 2015 ). However, n itrate in drinking water can be a problem, especially for infants. If nitrate measurements exceed the standard value, drinking water would be contaminated ( Oram, 2018 ).
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  • Fall '19
  • Drinking water, Water Research Center., Waterloo Water Quality

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