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Wed, 21 Feb 2007 12:17:20 -0600 |
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<<Disclaimer: Verify this information before applying it to your situation.>>
Had the following question about ppm, and attempted to
answer it as follows.
-----
Megan,
in food how would that work out ?
1/8 tsp. in __________ cups of flour for example?
Paula in Pa.
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A cup of flour weighs about 110 grams. So there are 9 cups
per Kg flour, roughly.
Flour, cornstarch, confectioners' sugar, and other
powdered ingredients have a density of approximately 9
grams (1/3 ounce) per tablespoon (as opposed to 15g per
tablespoon for most other denser ingredients).
Since there are ~ 3 teaspoons per tablespoon, it follows
that there are ~ 3 grams flour per teaspoon.
So we can apply the mg/Kg = 1 ppm conversion.
1 kg = 9 cups flour, and 1 mg = 0.00333 tsp flour.
1 ppm = 0.00003704 tsp per cup flour.
or, in more practical terms:
1 ppm = 1/8 tsp (0.125 tsp) per 3,375 cups flour.
Dr. Megan Tichy
Lecturer, Texas A&M University
3255 TAMU, Department of Chemistry
College Station, TX 77843-3255
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