| | Category | EV | P23 | Researching a Relevant Remedy to Repair Riparian Residences |
| | Abstract | Purpose: To determine if Ceratophyllum demersum and Lemna valdiviana |
| | are capable of absorbing quantities of nitrate from freshwater sources |
| | Hypothesis: Ceratophyllum demersum and Lemna valdiviana will absorb |
| | quantifiable amounts of nitrate; Ceratophyllum demersum will absorb a |
| | greater quantity of nitrate than Lemna valdiviana. The plants will absorb |
| | an increasing amount of nitrate comparable to the increased concentration |
| | of nitrate until the concentration absorbed resembles a logistic curve. |
| | Procedure: Pour 2 L of Artificial Lake Water into empty distilled water jugs. |
| | Enrich the ALW with nitrate so that seven jugs have a concentration 17.6 |
| | PPM; 8.8 PPM; 4.4 PPM; 2.2 PPM. Place 6 grams of Ceratophyllum |
| | demersum into three jugs of ALW with nitrate concentrations of 17.6 PPM; |
| | 8.8 PPM; 4.4 PPM; 2.2 PPM; 0.0 PPM. Place 6 grams of Lemna valdiviana |
| | into three jugs of ALW with nitrate concentrations of 17.6 PPM; 8.8 PPM; |
| | 4.4 PPM; 2.2 PPM; 0.0 PPM. Leave one jug of ALW with a nitrate |
| | concentration of 17.6 PPM; 8.8 PPM; 4.4 PPM; 2.2 PPM; 0.0 PPM. Test each |
| | jug of ALW for nitrate concentration every day for 14 days. |
| | Conclusion: Ceratophyllum demersum and Lemna valdiviana absorbed |
| | quantifiable amounts of nitrate. Ceratophyllum demersum absorbed nitrate |
| | more quickly than Lemna valdiviana, but Lemna valdiviana progressively |
| | absorbed nitrate while Ceratophyllum demersum absorbed nitrate only |
| | after immediate immersion in ALW. |
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