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並前往https://apps.sfwmd.gov/sfwmd/SFER/2017_sfer_final/front_matter/conversion.pdf

CONVERSION OF UNITS OF MEASUREMENT

1 ppm = 1 mg/L microgram per liter μg/L parts per billion ppb. 1 ppb = 1 μg/L nanogram per liter ng/L parts per trillon ppt. 1 ppt = 1 ng/L a.

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