A 3.10-mg sample of dioctyl phthalate (C24H38O4), a plasticizer, is dissolved in H2O 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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