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- In what way does waste water from nearby industry affect the pH and dissolved oxygen levels in rivers?

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- Once waste water from industry is flushed into the river, it leads to a decrease in pH levels, thus making the river water more acidic and also leading to a decrease in dissolved oxygen levels.

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- First, we took samples of water from the river near the its source and downstream past all the industry in the city. Once this had been done, we took the samples to a laboratory to test for pH levels.

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-The pH level in the samples was measure using a pH meter at our respective laboratories. The samples were placed in the meter and results were written down. After each sample, the meter had to be cleaned to be reused.

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- Samples before industry:

Croatia - 7,47
Poland - 7,5

The Netherlands - 7

- Samples after industry:

Croatia - 7,66
Poland - 7,8
The Netherlands - 6

- Due to circumstances, we weren't able to acquire data on the dissolved oxygen levels.

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This is the graphical representation of the change in the pH levels.

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- From the presented measurements, it appears that waste water from industry affects
the pH level of the water, either raising or lowering it, depending on the type of waste in the water (as presented, the waste in Croatia and Poland makes the water more alkaline, while the waste in the Netherlands makes it more acidic). In fact, the difference is the most drastic in the Dutch example. This change in pH negatively affects the marine life as it changes their environment into one that might be uninhabitable.

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- Croatia: Jan Grbac, Dominik Krušvar

- Poland: Jakub Płowucha, Łukasz Grech

- The Netherlands: Milan Pfeiffer, Rik de Jong