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S cience AR ound us A long H istory

Explore the various parameters that determine the quality of water in the MOLDOVA river, including dissolved oxygen, temperature, pH, turbidity, and nutrients. Learn how these factors affect aquatic life and the overall ecosystem.

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S cience AR ound us A long H istory

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  1. ScienceARoundusAlongHistory Comenius multilateral project The water qualitystudies Colegiul Tehnic „Danubiana” Roman

  2. The water quality of a stream can be determined in several ways. Water quality can be compared relatively between several water sources, or can be measured absolutely. Biological, chemical and physical factors can all indicate the quality of the water. Weatudesthe quality of MOLDOVA river. STEPS FOR STUDENTS : • identify significant water quality parameters. • read and interpret a contour map to determine the characteristics of a watershed. • discern the value of data from a single sample as compared to data from a series of samples. • graph, analyze, and summarize both spatial and chronological trends in water quality data. • compare and contrast the effects of water quality parameters on one another, especially the relationships between temperature and dissolved oxygen, and the relationships between flow and clarity.

  3. CHARACTERISTICS OF WATER Dissolved Oxygen (DO) Temperature pH (Acidity) Turbidity (Clarity) Nutrients (Nitrates and Phosphates)

  4. Dissolved Oxygen (DO) • We measure how many molecules of oxygen are in the water. • Since oxygen is important to fish and other aquatic life, higher DO readings support more diverse species and a healthier ecosystem. Low levels of DO can weaken or kill fish and other aquatic life.

  5. Temperature Aquatic animals (e.g. stream insects, trout and salmon) are sensitive to changes in water temperature and require a certain temperature range to survive and thrive. If water temperature is outside that range for a long time, organisms can be stressed and die. Temperature affects the amount of oxygen water can hold. Cold water holds more oxygen than warm water, and all aquatic animals need oxygen to survive.

  6. pH (Acidity) • We measured how acidic or basic a liquid is. pH is measured on a scale from 0-14, where 0 is most acidic, 14 is most basic, and 7 is neutral. A pH between 6.5 and 8.5 is favorable for supporting life in natural waters.

  7. Turbidity (Clarity) • Measures the water’s clarity. Debris, sand, silt, and other materials can make the water less clear (more turbid). Turbidity can impact the aquatic ecosystem by affecting photosynthesis, respiration, and reproduction of aquatic life. • Have students work in groups and distribute a test tube or juice glass and a Turbidity Test Student Copy Page to each group.

  8. Nutrients (Nitrates and Phosphates): • Chemicals that an organism needs to live and grow. Too many nutrients in a waterbody can cause excessive plant growth (e.g. algae blooms, scum) and decay. This can lead to higher turbidity, unpleasant smell and color, lower levels of dissolved oxygen and poor diversity of aquatic life. • High nutrient levels can be caused by runoff of fertilizers from lawns and farms, sewage discharges and excessive animal waste (e.g. pet waste, livestock manure).

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