This study is focused on the metals’ pollution level in sediment core collected from Manora Picnic Point of Karachi coastal area Pakistan. The sediment was categorized in terms of pH, particle size, total organic carbon (TOC), calcium carbonate, and heavy metals, besides the determining the mineralogy composition of sediment. Metals were determined using proton-induced X-ray emission spectroscopy (PIXE) technique. The results of abundant and heavy metals in the sediment core indicated a significant upward enrichment, which could be the cause of discharge of industrial effluents and domestic wastewaters of Metropolitan Karachi into sea. The average geo-accumulation index values showed that sediments were moderately polluted with Co and Pb, and unpolluted for metals (Al, Ca Mg, Cr, Cu, Fe, K, Mn, Ni, Ti, V, and Zn). The pollution load index values indicate an increasing trend from bottom to top, which may be due to the influence of anthropogenic sources. According to the sediment quality guidelines of United States Environmental Protection Agency (USEPA), core sediment was heavily polluted with Ni and moderately polluted with Pb, Cu and Zn.

本研究的重点是从巴基斯坦卡拉奇沿海地区的马诺拉野餐点收集的沉积物核心中的金属污染水平。除了确定沉积物的矿物组成外，还根据 pH 值、粒径、总有机碳 (TOC)、碳酸钙和重金属对沉积物进行分类。使用质子诱导 X 射线发射光谱 (PIXE) 技术测定金属。沉积物核心中丰富和重金属的结果表明显着向上富集，这可能是卡拉奇大都市工业废水和生活废水排放入海的原因。平均地累积指数值表明，沉积物受到 Co 和 Pb 的中度污染，金属（Al、Ca Mg、Cr、Cu、Fe、K、Mn、Ni、Ti、V 和 Zn）未受到污染。污染负荷指数值呈自下而上增加的趋势，可能受人为源的影响。根据美国环境保护署 (USEPA) 的沉积物质量指南，岩心沉积物受 Ni 严重污染，受 Pb、Cu 和 Zn 中度污染。