ppm to %

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ppm to %

Postby Guest » Sun Jan 24, 2010 6:40 pm

How do I convert ppm to %?
For instance:
Toothpaste with 0.76% sodium monofluorophosphate = ? ppm
Toothpaste with 0.243% sodium fluoride = ? ppm
Thank you!
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Re: ppm to %

Postby Dirtman » Mon Jan 25, 2010 7:44 am

Guest wrote:How do I convert ppm to %?
For instance:
Toothpaste with 0.76% sodium monofluorophosphate = ? ppm
Toothpaste with 0.243% sodium fluoride = ? ppm
Thank you!


ppm is parts per million; percent is parts per 100: 1,000,000 / 100 = 10 000

To convert percent to ppm, multiply by 10 000
To convert ppm to percent, divide by 10 000

0.76% * 10 000 = 7 600 ppm
Dirtman
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Re: ppm to %

Postby physicsmum » Tue May 25, 2010 3:13 am

Hi. The previous answer is incorrect as ppm on toothpaste is referring to parts of flourine (F), not of the MFP.
This is published research giving a couple of examples:
www*dot*ncbi*dot*nlm*dot*nih*dot*gov/pubmed/3288434
MFP 0.76 % = 1000 ppm
0.20% sodium fluoride (920 ppm fluoride), so your 0.243 % would be 1118 ppm

Hope this helps (and is correct...)

Jen Stratford.
physicsmum
 


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