Methods in the first step of this experiment four

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Methods In the first step of this experiment, four paper cups were labeled with rain, creek, tap and bottled water. After that, four types of water were added to corresponding cups. In testing bottled water, a phosphate test strip was dipped into the water directly for 1 second, then a nitrate/nitrite and a PH test strip were sequentially dipped into bottled water for 2 seconds. Afterward, the PH test strip was lashed and the value was read and recorded by colors of test strips and measurement scales immediately, and after 30 seconds, the nitrate and nitrite strip measurement were written down and the phosphate strip measurement was recorded after 3 minutes. The other three kinds of water were tested in the same method. During the lab, there might have deviations if not reading results within the specific time. Results 3
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During the lab, the colors of measured test strip were very similar, so it was sometimes hard to decide which value to record. The following tables and chart show the results for four types water quality tests. Table 1. Group Measured Values of Water Quality across Four Water Samples pH NO 2 (ppm) NO 3 - (ppm) PO 4 3− (ppm) Processed Water Bottled* 5.5 0.5 10 25 Tap 7.0 0.5 25 25 Unprocessed Water Rain 5.5 0.5 10 25 Creek 7.0 0.5 10 25 *Bottled water from Dasani remineralized water, 1.5L Table 1 shows test values my group measured. We found that bottled water and rain water were acidic while tap water and creek water were neutral. Besides, four types of water contained nitrates and phosphates, as well as very small amounts of nitrites. The contents of phosphate in four types water were all 25 ppm and nitrites were all 0.5 ppm. Tap water contained 25 ppm nitrates and the other three water contained 10 ppm nitrates. Table 2. Class Average Measured Values of Water Quality across Four Water Samples Water Samples pH NO 2 (ppm) NO 3 - (ppm) PO 4 3− (ppm) Processed Water Bottled* 5.4 0.2 4.5 7.5 Tap 6.9 0.5 31.5 22 Unprocessed Water Rain 5.5 0.8 12.5 16 Creek 6.45 0.15 7.5 19 *Bottled water from Dasani remineralized water, 1.5L 4
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Table 2 illustrates class average measurements of four water samples quality. Tap water and creek water were acidic in class average results. Tap water was the most acidic one which PH value was 5.4. Nitrite measurements were very small, and rain water had the highest level of nitrites which was 0.8 ppm. In addition, tap water contained the highest value of both nitrate and phosphate, for 31.5 ppm and 22 ppm respectively.
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  • Fall '19
  • Drinking water, Water Research Center., Waterloo Water Quality

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