DO vs TEMPERATURE

The higher the temperature of the sites, the lower the Dissolved Oxygen (DO). This is due to several reasons:

1. The solubility of oxygen varies with temperature. The concentration of Oxygen in the water is inversely proportionate to the temperature.
2. Due to high temperature (28 degrees Celcius), organisms such as tadpoles, planktons, plants and bacteria in the water require higher amount of DO to respire and carry out their activities as per normal.

Our results, however, shows a weak relation between these two parameters. This was probably due to experimental errors in measuring the temperature and DO values on site. Instead of dipping the DO cum Temperature probe into the water bodies, we collected samples from the sites into bottles before measuring them. The samples were left in the bottles for a length of time before they were measured for their temperature and DO values.

Hence, we can assume that some of the DO had escaped into the atmosphere and that the temperature had changed slightly when we tested them, causing varied or inaccurate values.