| 41. | You need a concentration of about 3000 parts per million to make extraction affordable.
|
| 42. | Human bone typically contains 900 parts per million of chlorine.
|
| 43. | The hazards are significant even at 5 parts per million.
|
| 44. | Seawater contains 180 parts per million of D 2 O.
|
| 45. | A tablespoon per gallon is only 100 parts per million.
|
| 46. | The acceptable level of cadmium in fish is 2 . 0 parts per million.
|
| 47. | Practical devices are linear to roughly one part per million.
|
| 48. | One part per million can make the difference between success and failure, Backhaus said.
|
| 49. | Levels under 60 parts per million can cause nausea, vomiting and abnormal heart rhythms.
|
| 50. | Levels of 1, 200 parts per million are considered dangerous.
|
