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Chemical Testing Experience Paper

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Today I met with Mr. Schwinnen during opt-out and after school to start my chemical testing for Trial 2. My goal was to finish all of the testing within two hours, but that did not happen. When I started, Mr. Schwinnen showed me a new YSI 9300 Photometer that he order before the new school year. He wanted me to use it to make sure that it worked. I started crushing the nitrogen tablets and putting them into test tubes of my water samples, but when I put the samples into the photometer, it would not turn on. Mr. Schwinnen and I spent about ten minutes figuring out how to change its batteries only to find that it still did not work. Eventually, I switched to the old photometer and things started to flow smoothly again. I finished collecting all of my nitrogen data and got Site 1 and Site 2’s phosphorus levels. Nitrogen levels were very different from Trial 1 to Trial …show more content…
First of all, Mr. Schwinnen taught me how the YSI 9300 Photometer actually worked. Basically, the tablets that I crushed into the water sample change the color of the water according to the certain element that I am looking for. For example, nitrogen turned pink while the phosphorus turned a light blue color. An unaltered sample must be put into the photometer first and light passes through the sample. Then when the colored changed sample is put into the photometer, light is passed through again. Then the machine compares the difference between the amount of light that completely passed through each sample. I also learned that I need to keep better track of what I am doing. For example, when I was letting my samples sit for the tablets to dissolve, I lost track of which site they were from. Luckily I figured it out but that could severely impact my data. Also, I did not fully screw on one of the sample’s caps which made a mess and it could have been easily avoided. Overall, I learned a lot about chemical testing

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