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Conversions
1%=10,000 ppm
1ppm= 1 µg/g = 1 µg /mL = 1 mg/kg
1 lb. = 454 g
1 g = 1000g = 10^6 mg = 10^9 µg
1 g = 1000mg = 10^6 µg
1 g = 1 mL (for liquids)
1 g /100mL =percent
(make sure all the units cancel out and you are left with the units you want)
1.
Want to find parts scuds per 1 million parts water
20mg*28 =560mg/200mL = 2.8 mg scuds/mL
Get to ppm convert to µg/mL
2.8 mg scuds/mL * (1000µg/1mg) =2800 ppm
Get to % divide ppm by 10,000
2800 parts/million (1 mill/10,000%) =.28%
2.
Want to find parts round worm per 1 million parts steak
8 oz. steak (1 lb./16 oz)*(454 g/1 lb) = 227 g steak
20 worms * 50 mg = 1000 mg worms
1000 mg worms/227 g steak = 4.4 mg worms/g steak (1000g/1 kg) = 4400 ppm
4400 ppm (1 mill/10,000 %) = .44%
3.
Want to find % and ppm calcium in soda
5mg Ca/500mL soda (1000µg/mg) = 10 ppm
10 ppm (1 mill/10,000%) = .001
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 Fall '11
 HOPKINS

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