ABSTRACT

The surface salt marsh sediments from marine ecosystems in the Bay of Bengal, Bangladesh was assessed for trace elements like iron (Fe), calcium (Ca), titanium (Ti), potassium (K), strontium (Sr), rubidium (Rb), zirconium (Zr), zinc (Zn), copper (Cu) and lead (Pb), their potential sources, and associated ecological risks. The range of trace elements in sediment (mg/kg) followed the decreasing order: Fe (25020–35176) > Ca (8679–16323) >Ti (2678–3340) > K (23680–16770) > Sr (138.32–209.64) > Rb (124–186.57) > Zr (96.21–161.35) > Zn (37.71–44.95) > Cu (36.51–51.66) > Pb (1.35–10.42). The concentrations of trace elements were under the average shale values of metals in sediment except for Fe, Cu and Rb, which can occasionally be associated with adverse biological effects. Contamination level and ecological risk were evaluated using contamination factor (CF), enrichment factor (EF), geo-accumulation index (I_geo), pollution load index (PLI), and potential ecological risk index (PERI). Multivariate statistical technique was used to classify the metal sources. The results showed that Fe was significantly enriched in the sediments. Ecological risk factors illustrated a pollution-free condition of the salt marsh ecosystem in Bangladesh.

摘要

对孟加拉国孟加拉湾海洋生态系统的表层盐沼沉积物进行了铁 (Fe)、钙 (Ca)、钛 (Ti)、钾 (K)、锶 (Sr)、铷 (Rb) 等微量元素的评估、锆 (Zr)、锌 (Zn)、铜 (Cu) 和铅 (Pb)，它们的潜在来源和相关的生态风险。沉积物中微量元素范围（mg/kg）依次递减：Fe（25020-35176）>Ca（8679-16323）>Ti（2678-3340）>K（23680-16770）>Sr（138.32-209.64） ) > Rb (124–186.57) > Zr (96.21–161.35) > Zn (37.71–44.95) > Cu (36.51–51.66) > Pb (1.35–10.42)。微量元素的浓度低于沉积物中金属的平均页岩值，但 Fe、Cu 和 Rb 偶尔会与不利的生物效应有关。I _geo )、污染负荷指数 (PLI) 和潜在生态风险指数 (PERI)。采用多元统计技术对金属来源进行分类。结果表明，Fe在沉积物中显着富集。生态风险因素说明了孟加拉国盐沼生态系统的无污染状况。