A 3.10-mg sample of dioctyl phthalate (C_{24}H_{38}O_{4}), a plasticizer, is dissolved in H_{2}O to give 650mL of solution.

Assuming the volume of the solution is equal to the volume of water.

Then 650 ml=650x1g/ml=650 g solution

Therefore the concentration of dioctyl phthalate is

3.10x10^-3/650=4.77x10^-6=4.77 ppm=4.77x10^3 ppb

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