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25 mcg / 0.5 mL: in ppm?

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  • 25 mcg / 0.5 mL: in ppm?

    Somebody I know is saying that 25 mcg / 0.5 mL is equivalent to 50,000 ppm, while I think it's only 50 ppm.

    The liquid involved is essentially aqueous in nature.

    Which of these is the correct result (or are both incorrect)?

    Thanks!

  • #2
    Originally posted by magicsquares View Post
    Somebody I know is saying that 25 mcg / 0.5 mL is equivalent to 50,000 ppm, while I think it's only 50 ppm.

    The liquid involved is essentially aqueous in nature.

    Which of these is the correct result (or are both incorrect)?

    Thanks!
    Easiest way is to multiply both numerator and denominator by 2, 50 g/mL. 1 mL of water is approximately 1 g and this is used as the basis for weight/volume concentrations. Treating as if it were 50 g/g, we see it is 50 parts per million.

    If it were milligrams instead of micrograms, "somebody" would have been correct.

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    • #3
      Thanks John!

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