ppm from Added Substance

Calculate the resulting concentration in ppm after a known mass of substance is added to a known volume of water.

$$\text{ppm}=\frac{\text{Mass of Substance Added}}{\text{Mass of Resulting Solution}}\times 1,000,000$$

Variables

Symbol	Meaning	Unit
Mass of Substance Added	Mass of solute introduced	lb
Mass of Resulting Solution	Mass of solute plus mass of water	lb
ppm	Resulting concentration	ppm

Worked example

Add 17 lb of sodium chloride to 300 gal of water. Water mass is 300 gal times 8.34 lb/gal, which is 2,502 lb. Solution mass is 17 plus 2,502, which is 2,519 lb. ppm is (17 / 2,519) times 1,000,000, which is 6,750 ppm.

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Part of The Blueprint of Water