| 31. | The federal standard is 10 micrograms of arsenic per liter of water.
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| 32. | Humans ingest on average less than 20 micrograms of bismuth per day.
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| 33. | The protein is prepared in a lyophilized 1 microgram dose.
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| 34. | The lead concentration is less than 1 microgram per liter.
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| 35. | The concentration of iron ranged from 120 to 740 micrograms per liter.
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| 36. | The arsenic concentration was once measured to be 77 micrograms per liter.
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| 37. | The recoverable iron concentration ranged from 160 to 410 micrograms per liter.
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| 38. | Tests found 1, 020 micrograms of morphine per litre of blood.
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| 39. | A plank mass black hole would be about 21.7 micrograms.
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| 40. | The average concentration of iron was 397.37 micrograms per liter.
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