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Page Title:
Table 4. Examples of Metal Hyperaccumulator Plants (EPA 1996) |
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 Technical Note DOER-C3
May 1999
Table 4
Examples of Metal Hyperaccumulator Plants (EPA 1996)
Metal in Dry Weight
Metal
Plant Species
of Leaves, %
Native Location
Thlaspi calaminare
Zinc
<3
Germany
Viola sp.
1
Europe
Aeolanthus biformifolius
1
Zaire
Copper
Phyllanthus serpentinus
Nickel
3.8
New Caledonia
Alyssum bertoloni and 50 other
>3
Southern Europe and Turkey
species of alyssum
Sebertia acuminata
25 (in latex)
New Caledonia
Stackhousia tryonii
4.1
Australia
Brassica juncea
Lead
<3.5
India
Haumaniastrum robertii
Cobalt
1
Zaire
Asstragalus sp.
Selenium
>1
Wyoming*
* Personal Communication, March 1999, Rufus Chaney.
Assessment of Plant Uptake/
Degradation of Contami-
nants. The fate of many con-
taminants, except for some
metals, in vegetation growing on
dredged material is not well un-
derstood. Previous testing of
contaminants in plant tissues was
conducted prior to analytical
chemistry developments that
either provide for plant tissue
analysis or detection capabilities
low enough for plant analysis.
As a result, limited information
is available to determine the fate
of many contaminants in plants.
Consequently, testing on a case-
by-case basis is still necessary.
A plant bioassay test (Folsom
and Price 1989) and American
Society for Testing and Materials
(ASTM) Standard Method (ASTM
1996) are used to determine con-
taminant uptake by plants grown
in freshwater dredged material
(Figure 6). The plant bioassay
procedure is a 45-day test from
Figure 6. Schematic of WES plant bioassay apparatus
p l a n t i n g to h a r v e s t o f plant
10
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