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dissolved oxygen mg/l to ppm?

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  • dissolved oxygen mg/l to ppm?

    Hi

    Can anyone give me an idea of how to convert my mg/l Dissolved Oxygen in water to ppm?

    Many thanks

    Owen

  • #2
    Re: dissolved oxygen mg/l to ppm?

    Originally posted by Unregistered View Post
    Hi

    Can anyone give me an idea of how to convert my mg/l Dissolved Oxygen in water to ppm?

    Many thanks

    Owen
    Ppm is ambiguous as it can be a ratio by weight, volume, or mole fraction. Which do you want?

    If ppm by weight is OK, a liter of (cool) water is pretty close to a kilogram (for high accuracy work, you could look up density as a function of temperature). Simplistically using 1 kg of water = 1 L, you would have mg/kg, which IS ppm by weight.

    At 20 C, density of water is 0.998 kg/L. If you really had the supporting accuracy in your O2 figure, you could divide by this as a minor correction. As water approaches normal boiling point, density is about 0.95 kg/L and correction should probably be made.

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    • #3
      Re: dissolved oxygen mg/l to ppm?

      Many thanks for your reply. I am only measuring Do in bubbled water so as to keep it at a suitable level to grow aerobic bacteria so absolute accuracy is not an issue.
      Thanks again

      Owen

      Comment


      • #4
        Re: dissolved oxygen mg/l to ppm?

        For all practical purposes 1 mg/l of DO = 1ppm.

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