Sediment samples were collected from ten selected sites of the lower Meghna River estuary, and six heavy metals were analyzed with Atomic Absorption Spectrophotometry (AAS) to assess the contamination level and the metals’ association with sediment grain size. The current results revealed that the mean concentrations of the studied metals were ranked in descending order of iron (Fe) (1.29 × 10³ mg/kg) > zinc (Zn) (42.41 mg/kg) > lead (Pb) (12.48 mg/kg) > chromium (Cr) (10.59 mg/kg) > copper (Cu) (6.22 mg/kg) > cadmium (Cd) (0.28 mg/kg). The geo-accumulation, contamination, and pollution load indexes suggested that the lower Meghna river estuary was not contaminated by Fe, Zn, Pb, Cr, and Cu. The mean size of the sediment ranged from 28.92 to 126.2 μm, and the Pearson correlation coefficient showed a significant association between Fe and Pb (coefficient of determination, r² = 0.836; p < 0.05), and no significant correlation was found between individual metals and grain size, indicating no or low influence on the metals distribution.

从梅格纳河下游河口的十个选定地点收集沉积物样品，并使用原子吸收分光光度法（AAS）分析六种重金属，以评估污染水平以及金属与沉积物粒径的关系。目前的结果表明，所研究金属的平均浓度按铁（Fe）的降序排列（1.29×10 ³ mg / kg）>锌（Zn）（42.41 mg / kg）>铅（Pb）（12.48 mg / kg）>铬（Cr）（10.59 mg / kg）>铜（Cu）（6.22 mg / kg）>镉（Cd）（0.28 mg / kg）。地质累积，污染和污染负荷指数表明，梅格纳河下游河口未受到铁，锌，铅，铬和铜的污染。沉积物的平均尺寸在28.92至126.2μm之间，并且Pearson相关系数显示Fe和Pb之间具有显着的相关性（测定系数，r ²  = 0.836；p  <0.05），并且各个金属之间没有显着的相关性。和晶粒尺寸，表明对金属分布没有影响或影响很小。