Publication: Toxicity and accumulation of cadmium and zinc in hydrocotyle umbellata.
1
Issued Date
2006
Resource Type
Language
eng
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Mahidol University
Rights Holder(s)
The Science Society of Thailand under Royal Patronage and the National Research Council of Thailand
Bibliographic Citation
Science Asia. Vol. 32, (2006), 323-328.
Suggested Citation
Sopit Panyakhan., Maleeya Kruatrachue., Prayad Pokethitiyook., Varasya Soonthornsarathoon., Suchart Upatham. Toxicity and accumulation of cadmium and zinc in hydrocotyle umbellata.. Science Asia. Vol. 32, (2006), 323-328.. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/8783
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Title
Toxicity and accumulation of cadmium and zinc in hydrocotyle umbellata.
Other Contributor(s)
Abstract
The aquatic plant, Hydrocotyle umbellata, was tested for toxicity and
accumulation of Cd and Zn under laboratory conditions. H. umbellata
were cultured in modified 10% Hoagland solution supplemented with 0.2,
0.4, 0.6, 0.8 and 1 mg/L Cd and 2, 4, 6, 8, 10 and 50 mg/L Zn and were
separately harvested after 3, 6, 9 and 12 days. The toxicity symptoms of
H. umbellata exposed to Cd and Zn at different concentrations and
exposure times were stunted growth and chlorosis in leaves. Finally,
some plants died at higher concentrations of metals. The symptoms were
more severe at higher metal concentrations. Cd and Zn caused significant
decreases in biomass productivity and chlorophyll content when the
exposure times and concentrations of both metals were increased. There
were significant increases in metal levels in plant tissues when the
exposure times and metal concentrations were increased. Both metals
accumulated in roots more than in shoots. The high values of
bioconcentration factor (BCF) of Cd (7173, at 0.2 mg/L) and Zn (1717, at
2 mg/L) on day 9 of exposure suggested that H. umbellata is a good
candidate for removal of Cd and Zn from contaminated water.