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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
environmental science
Toxicity and removal of heavy metals (cadmium, copper, and zinc) by Lemna gibba
Ecotoxicology and Environmental Safety, Volume 72, No. 6, Year 2009
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Description
Effects of cadmium, copper, and zinc on the aquatic plant Lemna gibba were determined under controlled conditions; in parallel their removal from the growth medium was followed. The results showed that the three heavy metals affected growth, a physiological stress index defined as the ratio of Chlorophyll to phaeophytin (D665/D665a), and the contents of proline. After 4 days, 10-3-10-1 mg/L Cd inhibited growth by 25-100%, reduced D665/D665a by 35-89%, and increased proline content by 44-567%. Under the same conditions, 10-4-10-1 μg/L Cu inhibited growth by 36-75%, reduced D665/D665a by 19-81%, and increased proline content by 67-288%. Comparable concentrations of Zn had little effect. However, higher concentrations (4, 30, and 50 mg/L) inhibited growth by 50-79%. Also, 0.1 and 30 mg/L induced a small reduction of D665/D665a (-3.8% and -22%) and an increase in proline contents (+144% and +177%). When it was observed, proline accumulation was always transient and the maximum was reached after 4 days. Monitoring metal concentration in the medium showed that L. gibba was able to remove metals from the medium. Zn and Cu removal was biphasic, it was rapid during the first 2 days (> 60% reduction) and slow (10-20%) during the following 8 days. For Cd, removal was linear and depended on the initial concentration. It reached approximately 90% after 6 or 8 days for initial concentrations of 10-1 and 10-3 mg/L, respectively. © 2009.
Authors & Co-Authors
Megateli, Smain
Algeria, Blida
Université Blida 1
France, Reims
Université de Reims Champagne-ardenne
Semsari, Saida
Algeria, Blida
Université Blida 1
Couderchet, Michel
France, Reims
Université de Reims Champagne-ardenne
Statistics
Citations: 190
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1016/j.ecoenv.2009.05.004
ISSN:
01476513
e-ISSN:
10902414