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Using Thlaspi plants to clean zinc-contaminated soilFeatured science projectScience project video


The hypothesis that the amount of zinc removed from the soil by the Thlapsi plant will not be significant, has been proven to be true. However, phytoremediation is a time-consuming process, and is hence more effective in rehabilitating soil over the long term.

The use of phytoremediation to remove contaminants from soil and pond water has been gaining popularity over the past 20 years. This is because it is very cost-effective and environmentally friendly, compared to soil excavation works. However, phytoremediation is a very time-consuming process, and cannot prevent the contamination of groundwater.


Also consider

The science fair project may be repeated using spinach instead of the Thlaspi plant, to compare the effects of other plants on the zinc content in soil.

The science fair project may also be modified to compare the rehabilitating abilities of other types of plants, like sunflowers, in removing other types of minerals.


Phytoremediation -

Phytoremediation: using plants to clean up soils-

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Complexity level:
Project cost ($):
Time required:
1 day for preparation, 120 days for observation
Material availability:
Easily obtained from a gardening supplies store. However, you will need to send your soil samples to a laboratory for testing
Safety concerns: