If a pesticide contains 5.4 pounds of A.I. in 1 gallon of formulation, how many pounds of A.I. are needed for 1 pound of spray solution at a concentration of 100 ppm?

To determine how many pounds of active ingredient (A.I.) are needed for 1 pound of spray solution at a concentration of 100 parts per million (ppm), it’s important to understand the relationship between ppm and weight in this context.

1 ppm means that there is 1 part of A.I. per one million parts of solution. Therefore, 100 ppm implies that there are 100 parts of A.I. per million parts of solution.

To find out how many pounds of A.I. are necessary for 1 pound of spray solution at this concentration, you can use the following calculation:

1 pound of spray solution is equivalent to 1,000,000 milligrams (since there are 1,000 grams in a kilogram and 1,000 milligrams in a gram). Given this, 100 ppm means:

• There is 100 mg of A.I. in 1,000,000 mg of solution.

To find out how many pounds this corresponds to, you take the 100 mg of A.I. and convert it to pounds:

• Since there are 453,592 mg in a pound, you can compute the amount of A.I. needed:

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