Publication: Toxicity and accumulation of cadmium and zinc in hydrocotyle umbellata
Issued Date
2006-09-01
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ISSN
15131874
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2-s2.0-33750408976
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Mahidol University
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SCOPUS
Bibliographic Citation
ScienceAsia. Vol.32, No.3 (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. ScienceAsia. Vol.32, No.3 (2006), 323-328. doi:10.2306/scienceasia1513-1874.2006.32.323 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/23938
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Title
Toxicity and accumulation of cadmium and zinc in hydrocotyle umbellata
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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.