X-ray microanalytical study on Cyclotella meneghiniana (Bacillariophyceae) as a bio-indicator for metal pollution in marine and fresh water environments
2000
El-Bestawy, E. (Alexandria Univ. (Egypt). Dept. of Environmental Studies)
Many industries on Alexandria discharge loads of heavy metals without treatment Lake Mariut and the Mediterranean Sea leading to massive metal pollution. The present study was carried out on Cyclotella meneghiniana; the most common phytoplankton dominating the water of the hypertrophic polluted Lake Mariut and the north cost of Alexandria at El-Mex over three successive seasons at each environment. The study aimed to investigate the possibility of using this diatom as a bio-indicator organism for metal pollution. X-ray emission spectra obtained from C. meneghiniana revealed a wide range of detectable elements. Clear seasonal and spatial variations in the elemental composition of C. meneghiniana were observed. Concerning heavy metals, clear peaks of Fe and Cu were routinely detected in C. meneghiniana collected from the two environments, with relatively higher levels in L. Mariut compared to the sea. Lower levels of Mn, Co and Ni were also detected in C. meneghiniana, but with reactively higher levels in the marine environment. Levels of the accumulated metals in C. meneghiniana were correlated with their levels in the surrounding environment and a comparison was make between the two environments. However, results indicated that C. meneghiniana could be efficiently used as a bio indicator organism to detect metal pollution due to its wide distribution and frequent occurrence though different seasons, in addition to its ability to uptake a wide range of metals.
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Эту запись предоставил National Agricultural Research Centre