The chemical characteristics of rainwater in the south-eastern region of Bangladesh were investigated in this study in addition to identifying the potential sources of different precipitation constituents, which have often been unexplored or not well covered in the literature. Rainwater pH, major ions and trace metals were measured in samples collected from five different locations with different land-use patterns of the Chattogram Metropolitan area (CMA) during two rainy seasons. The results of this study showed variability in rainwater quality across the sites signifying site-specific influences. The mean concentration of all measured physicochemical parameters, ions and trace metals in rainwater samples was also found to be significantly lower compared with the drinking water quality standard of Bangladesh and WHO guidelines. The correlation matrix and principal component analysis (PCA) indicated that and originated from anthropogenic sources, while the average concentration of trace metals found in rainwater was exhibited in the following order: Zn>Cu>Fe>Cr>Mn>Pb>Cd. The findings of this study could be used as a reference to further investigate the influences of industrial, urban and agricultural emissions that regulate the chemical characteristics of the atmosphere in particular areas of study.

除了确定不同降水成分的潜在来源外，本研究还调查了孟加拉国东南部地区雨水的化学特征，这些成分通常未被探索或在文献中没有很好地涵盖。在两个雨季期间，从 Chattogram 大都市区 (CMA) 的五个不同土地利用模式的不同地点收集的样本中测量了雨水 pH 值、主要离子和痕量金属。这项研究的结果表明，不同地点的雨水质量存在差异，这表明了特定地点的影响。与孟加拉国的饮用水质量标准和世卫组织指南相比，还发现雨水样品中所有测量的理化参数、离子和痕量金属的平均浓度显着降低。和源自人为来源，而在雨水中发现的痕量金属的平均浓度按以下顺序展出：锌>铜>铁> CR>锰>铅>镉。本研究的结果可作为参考，进一步调查工业、城市和农业排放对特定研究领域大气化学特征的影响。