Spatial distribution of cadmium and lead in the sediments of the western Anzali wetlands on the coast of the Caspian Sea (Iran) |
| |
| Authors: | Rasool Zamani-Ahmadmahmoodi Abbas Esmaili-Sari Jahangard Mohammadi Alireza Riyahi Bakhtiari Mozhgan Savabieasfahani |
| |
| Institution: | 1. Department of Environment, Faculty of Natural Resources and Marine Science, Tarbiat Modares University, P.O. Box 46414-356, Noor, Mazandaran, Iran;2. Department of Soil Science, College of Agriculture, Shahrekord University, Shahrekord, Iran;3. P.O. Box 7038, Ann Arbor, MI 11 48107, USA |
| |
| Abstract: | Spatial distribution patterns of total cadmium (Cd) and lead (Pb), their bioavailable fractions and total organic matter in sediment from Anzali wetlands are provided. Total sediment Pb was higher than Cd (34.95 versus 0.024 μg/g dry weight). The geoaccumulation index indicated that the sediment was “uncontaminated”, but some stations were categorized as “unpolluted” to “moderately polluted”. Less than 0.01 of Pb existed in exchangeable and carbonate fractions. The sum of exchangeable and carbonate-bound fractions of Cd was 42%, suggesting that Cd poses high risk to the aquatic ecosystems. Total Cd and Pb exhibited positive relationships with total organic matter. Considering spatial distribution maps of total and bioavailable fractions of metals suggested that high concentrations of metals does not necessarily indicate high bioavailable fraction. The methodologies we used in this study can be in more effective management of aquatic ecosystems, as well as ecological risk assessment of metals, and remediation programs. |
| |
| Keywords: | Heavy metals Bioavailable fraction Risk assessment Anthropogenic influences Geoaccumulation index Geostatistics |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
