- 期刊
- OpenAccess
Heavy Metals Fractionation and Acid Volatile Sulfide (AVS) in the Bardawil Lagoon Sediments, Northern Sinai, Egypt
並列摘要
Bardawil Lagoon in North Sinai, Egypt, is a unique Mediterranean semi-enclosed coastal water body that is listed among the Ramsar Wetlands of International Importance. The present study is to characterize the distribution of some heavy metals (Fe, Cu Pb and Cd) in Bardawil Lagoon sediments and evaluate the sediment quality based on heavy metals fractionation as well as acid volatile sulfide (AVS) and simultaneously extracted metals (SEM). Grain size analysis, carbonate (CaCO3) and organic matter content have been determined in surface sediments collected at 10 stations from the Bardawil lagoon. The results showed high percentage of CaCO3, ranged from 53.5 to 70.5%. The ratio of ΣSEM / AVS was higher than one in Bardwell lagoon sediments (ΣSEM / AVS ranged from 1.28 to 9.19). These data would allow us to classify the sediments as toxic. The extractable concentrations of Fe, Cu, Pb and Cd were evaluated in the sediments using sequential extraction procedure. Metals concentration in the exchangeable and carbonate fractions was found in the following order: Fe＞Pb＞Cu＞Cd, whereas they follow the order of Fe＞Cu＞Pb＞Cd in the oxide fraction. In the organic form, metals had the sequence of Fe＞Pb ≈ Cu ＞Cd. The sequences of metals concentration in the residual fraction were as follow: Fe＞Pb＞Cu＞Cd The results of Pb and Cd fractionation reflect the dangers of these metals which more than 75% are associated with the non-residual fractions.
延伸閱讀
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