turbidity (poster).docx - Background Sediment is the main...

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Background Sediment is the main source of water pollution and is the main cause of a high level of turbidity (Line, 2013). Water clarity is measured by turbidity which means that cloudy water will have a higher level, and clear water will have a lower level. Water appears cloudy due to the sunlight reflecting off the particles that are mixed in it. Erosion, amount of rainfall, industrial waste, and animals may affect the level of turbidity as the dirt and sediment may become more stirred into the water. Normal turbidity levels are between 1 NTU and 100 NTU (Vernier, 2007). The more cloudy the water is, the easier it is to warm. Dissolved oxygen is in higher demand if the water they live in has a high temperature. However, this can potentially be dangerous for the fish due to the fact that as the water temperature increases, the availability of dissolved oxygen decreases, which may harm aquatic life. Methods and Materials Water samples were collected from six stream sites in the Balcones Canyonland Preserve. After the water samples were collected, it was time to calibrate the turbidity sensor. To do so, distilled water was first placed in the sensor and “0” NTU was typed into the edit box in Logger Pro. Next, the Turbidity Standard with a level of 100 NTU was calibrated. Once the sensor was calibrated, a small sample of water from each of the six sites was poured into the cuvette and placed in the sensor one sample at a time. The outside of the cuvette had to be kept dry and there could not be any air bubbles inside or else it would mess with the turbidity reading. Between
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