pH

What is it?

pH is a measure of the hydrogen ion concentration of a solution. Solutions with a high concentration of hydrogen ions have a low pH and solutions with a low concentrations of H+ ions have a high pH.

How do we measure it?

pH is measured by two major ways. The cheaper, but less reliable option, is litmus paper where the color it turns determines the pH. Although a good tool for general pH of substances, it is done qualitatively based on the color, so a more accurate way was necessary for our research. We used a probe that read pH more accurately to measure the pH of the Bronx River.

Why does it matter in regards to the Bronx River water quality?

pH is important to any ecosystem, but in the context of the river it can tell us a few things. If the pH is incredibly basic (low pH) or incredibly acidic (high pH) it is reasonable to assume some sort of chemicals, paint, etc. is present in the river. Such a finding would provide a launching pad for extended research.

pH data may not be accurate due to issues with the Vernier LabQuest probes. New equipment is being investigated for improved accuracy.