Elevated turbidity can cause an increase in temperature since suspended particles absorb heat. Reduction of light penetrating the water column due to turbidity can decrease the rate of photosynthesis. This, in turn, can decrease the amount of dissolved oxygen in the water. As suspended particles settle, they can impair the habitat needed for fish spawning and aquatic macroinvertebrates. They can also clog the gills of fish and the breathing apparatus of invertebrates.
Particles serve as places of attachment for harmful microorganisms and toxic materials.
Turbidity in drinking water is decreased through the process of flocculation, which involves the addition of alum or a mixture of iron, lime, and chloride to cause solids to settle out. Bring the beakers containing the water samples back to the turbidity lab station in the main cabin. Measure the top water sample first, then measure the bottom water sample. Put the cap on the cell and wipe the cell with a soft, lint-free cloth to remove water spots and finger prints. Gently invert the sample cell 2-3 times and place the sample cell in the instrument cell compartment.