What is the parts per million volume (PPMV) formula?

The formula for parts per million volume (PPMV) is designed to quantify the concentration of a substance in a solution, allowing for a clear understanding of how much of a chemical is present in a specified volume of water.

In the correct option, the formula calculates PPMV by taking the volume of the chemical in gallons and converting it into a volume that can be expressed as parts per million by multiplying it by 1,000,000. The denominator represents the total flow of water being treated, calculated by multiplying the cubic feet per second (CFS) by 450, which is a factor used to convert CFS to gallons, and then further scaled by the number of minutes the chemical is applied. This arrangement ensures that the concentration of the chemical is accurately represented as a part of the total volume of water treated.

Using this method is essential for ensuring that aquatic environments are not negatively affected by the application of pesticides, as it allows for precise calculations that determine safe and effective concentrations. This approach emphasizes the importance of flow rate and duration in determining the total volume of chemical exposure relative to the water body being treated.