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Nitrogen Absorption by Water Hyacinths and Salvinia

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Title: Nitrogen Absorption by Water Hyacinths and Salvinia


1
Nitrogen Absorption by Water Hyacinths and
Salvinia
2
Abstract
  • Water Hyacinth and Salvinia are buoyant plants
    that live in water and are sustained via nutrient
    absorption from sub aquatic root systems
  • My hypothesis was that these plants would
    decrease nitrate concentrations in water
  • Nitrates, caused by human and animal waste
    products, are a common water pollutant

3
Water Hyacinths are already being used as a
natural means to purify sewage
4
Method
  • Ten habitats were made five per plant
  • Potassium Nitrate was added in one-fourth
    decreasing increments using molals
  • The fifth container acted as a control
  • Deionized water was used to eliminate other
    nutrients and minerals
  • Nitrate levels were determined berfore plant
    addition and one week after addition in parts per
    million

5
Method
  • In each of the experiments the lowest Nitrate
    concentration of the experiment before it was
    divided in fourths to give the new lower
    concentrations for the next test group
  • Salvinia use was discontinued after the second
    experiment
  • For the remainder of the research five more
    Hyacinths replaced the Salvinia and the Nitrate
    level for these was lowered

6
Experiment One
  • All of the plants except for the control groups
    died by the end of experiment one
  • These concentrations were high and this was expect

7
Death of PlantsExperiment 2
8
Nitrate Levels Experiment One
9
Nitrate Levels Experiment Two
10
Nitrate Levels Experiment Three
11
Nitrate Levels Experiment Four
12
Results
  • In Experiments one and two the nitrogen content
    was not decreased enough for my test kit to
    determine nitrate depletion
  • Experiments three and four exhibit the ability of
    the Hyacinths to decrease nitrates in water
  • The plant was most efficient between .00095
    moles/liter and .0012 moles/liter that is between
    0 and 10 parts per million

13
Conclusions
  • Hyacinths in an environment of nitrates and
    potassium only do efficiently remove nitrates at
    low molar concentrations
  • However, the plant may better eliminate nitrates
    in the presence of other nutrients and in
    environments less stressful than those found in
    the laboratory
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