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  #1  
Old 08-26-2009, 03:53 AM
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Default 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
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Old 08-26-2009, 04:42 AM
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Default Re: dissolved oxygen mg/l to ppm?

Quote:
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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Old 08-27-2009, 12:36 AM
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Default 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
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Old 08-28-2009, 08:24 AM
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Default Re: dissolved oxygen mg/l to ppm?

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