Department of Petroleum and Mining Engineering, Jashore University of Science and Technology, Jashore, 7408, Bangladesh.
Environ Sci Pollut Res Int. 2022 Nov;29(54):81557-81570. doi: 10.1007/s11356-022-21522-1. Epub 2022 Jun 22.
Spatial distribution and pollution assessment of selected heavy metals such as barium (Ba), chromium (Cr), nickel (Ni), lead (Pb), vanadium (V), arsenic (As), zinc (Zn), and copper (Cu) in sediments of the Brahmaputra River watershed in Bangladesh was investigated. The mean abundances (ppm) of heavy metals in sediment samples were in decreasing order Ba (375.60) > V (67.60) > Cr (54.10) > Zn (48.20) > Ni (22.28) > Pb (20.25) > Cu (7.59) > As (4.21). Concentrations of Pb and As in the sediments are enriched relative to the average upper continental crust composition, while Ba, V, Cr, Zn, Ni, and Cu decrease considerably. A higher concentration of Pb and Ni indicates that Brahmaputra River watershed samples receive a significant contribution from anthropogenic sources of heavy metals. Chromium displays marked positive correlation with V (r = 0.91, p = < 0.01), inferring a similar source materials input into the watershed. The geo-accumulation index (I) values suggest that the sediments were uncontaminated to moderately contaminated by Ni, Zn, Pb, V, and Cr, whereas moderate to heavily contaminated by As and Cu. The contamination factor (CF) confirmed that sediments in the watershed were moderate to highly contaminated by As, Cu, and Cr. The pollution load index (PLI) values for most of the samples were over one (> 1), indicating an advanced decline in the watershed sediment quality. The overall results of a multivariate statistical analysis suggest that Ba, V, Cr, and Zn contents were all-natural sources, and Pb, Ni, As, and Cu were derived from both natural and anthropogenic sources.
本研究调查了孟加拉国布拉马普特拉河流域沉积物中钡（Ba）、铬（Cr）、镍（Ni）、铅（Pb）、钒（V）、砷（As）、锌（Zn）和铜（Cu）等选定重金属的空间分布和污染评估。沉积物中重金属的平均含量（ppm）按降序排列为 Ba（375.60）>V（67.60）>Cr（54.10）>Zn（48.20）>Ni（22.28）>Pb（20.25）>Cu（7.59）>As（4.21）。与平均上地壳组成相比，沉积物中 Pb 和 As 的浓度较高，而 Ba、V、Cr、Zn、Ni 和 Cu 的浓度则显著降低。较高浓度的 Pb 和 Ni 表明，布拉马普特拉河流域样品受到人为来源重金属的显著影响。Cr 与 V 呈显著正相关（r=0.91，p<0.01），表明流域输入了相似的源材料。地积累指数（I）值表明，沉积物受到 Ni、Zn、Pb、V 和 Cr 的轻度至中度污染，而受到 As 和 Cu 的中度至重度污染。污染因子（CF）证实，流域沉积物受到 As、Cu 和 Cr 的中度至高度污染。大多数样品的污染负荷指数（PLI）值均超过 1，表明流域沉积物质量出现严重下降。多元统计分析的总体结果表明，Ba、V、Cr 和 Zn 的含量均为自然来源，而 Pb、Ni、As 和 Cu 则来自自然和人为来源。
