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並前往https://mimoza.marmara.edu.tr/~zehra.can/CHEM209/02.%20Concentration%20Expressions.pdf

Concentration mg / kg in soil mg / kg in water mg / L in water ...

ppm is an abbreviation of parts per million. ppm is dimensionless quantity, a ratio of 2 quantities of the same unit. For example: mg/kg. 1 ppm ...

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