Rahman Mahfuzur, Saima Jerin, Rima Sabrina Akhter, Hossain Md Imam Sohel, Das Delip K, Bakar Muhammad Abu, Siddique Mohammad Abdul Momin
Department of Oceanography, Noakhali Science and Technology University, Noakhali 3814, Bangladesh.
Department of Oceanography, Noakhali Science and Technology University, Noakhali 3814, Bangladesh.
Mar Pollut Bull. 2022 Jun;179:113688. doi: 10.1016/j.marpolbul.2022.113688. Epub 2022 Apr 28.
Ten surficial sediment samples (up to a depth of 3 cm) were randomly collected during the pre-monsoon and analyzed for nine heavy metals using an atomic absorption spectrophotometer (AAS) to assess the distribution, contamination levels, and potential sources of heavy metals. The particle size distribution of the sediments was also investigated using a laser particle size analyzer. The mean concentration (mg/kg) of the analyzed metals followed a decreasing order of Fe (4706.24) > Mn (95.20) > Cu (36.97) > Zn (20.65) > Ni (9.26) > Cr (7.20) > Pb (5.63) > Co (5.52) > Cd (0.29). Surficial sediment of the Island was low to moderately contaminated by Cd and, to a laser extent by Cu in terms of enrichment factor (EF), geo-accumulation index (Igeo), and contamination factor. Ecologically, the Nijhum Dweep area was at low to moderate risk, where Cd was the most potential ecological risk factor. The Pearson correlation analysis revealed a significant positive correlation among Cr, Pb, Zn, Mn, Cd, Fe, Co, Ni, and silt particles, whereas a negative correlation with sand particles. No correlation was found with Cu and other metals except clay particles.
在季风来临前随机采集了10个表层沉积物样本（深度达3厘米），并使用原子吸收分光光度计（AAS）对9种重金属进行分析，以评估重金属的分布、污染水平和潜在来源。还使用激光粒度分析仪研究了沉积物的粒度分布。分析的金属的平均浓度（毫克/千克）依次为：铁（4706.24）>锰（95.20）>铜（36.97）>锌（20.65）>镍（9.26）>铬（7.20）>铅（5.63）>钴（5.52）>镉（0.29）。就富集因子（EF）、地累积指数（Igeo）和污染因子而言，该岛的表层沉积物受到镉的低度至中度污染，在一定程度上受到铜的污染。从生态角度来看，尼朱姆迪普地区处于低度至中度风险，其中镉是最具潜在生态风险的因素。皮尔逊相关分析显示，铬、铅、锌、锰、镉、铁、钴、镍与粉砂颗粒之间存在显著正相关，而与砂粒呈负相关。除粘土颗粒外，未发现铜与其他金属之间存在相关性。
