| 21. | The alkalinity concentration ranged from 0 to 3 parts per million.
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| 22. | On average, tin makes up 1 part per million of soil.
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| 23. | The maximum residue permitted on peas is 0.1 parts per million.
|
| 24. | The safe level is between 1 . 5 to 3 parts per million.
|
| 25. | The FDA action level for methylmercury is 1 part per million.
|
| 26. | He said the sample contained 16, 000 parts per million of the steroid.
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| 27. | DON contamination is measured in parts per million ( ppm ).
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| 28. | The safe level is between 1.5 to 3 parts per million.
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| 29. | Chautauqua exceeds it the most, at . 089 parts per million.
|
| 30. | The current standard is 0 . 12 parts per million over one hour.
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