| sewer | 0.38 |
| enter surface water | 0.51 |
| exist in groundwater | 0.50 |
| produce bacteria | 0.47 |
| occur in the environment | 0.34 |
| convert to sodium hydro… | 0.34 |
| cause yellow or black s… | 0.29 |
| relax blood vessels | 0.25 |
| act as reducing agent | 0.25 |
| occur in the gut | 0.25 |
| seek out underground fa… | 0.25 |
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| death | 0.34 |
| odor | 0.16 |
| nausea | 0.16 |
| unconsciousness | 0.16 |
| pungent smell | 0.48 |
| colorless gas | 0.58 |
| gas | 0.52 |
| a chemical compound | 0.44 |
| produced | 0.63 |
| removed | 0.52 |
| converted to elemental … | 0.47 |
| present in well | 0.44 |
| released | 0.34 |
| absorbed into straw | 0.29 |
| removed by the membrane… | 0.25 |
| dissolved in water | 0.23 |
| absorbed into wood | 0.20 |
| absorbed into paper | 0.20 |
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