University of Science, Faculty of Environment, Vietnam National University Ho Chi Minh City (VNUHCMC), 227 Nguyen Van Cu St., W4, D5, Ho Chi Minh City, Vietnam.
University of Science, Faculty of Geology, Vietnam National University Ho Chi Minh City (VNUHCMC), 227 Nguyen Van Cu St., W4, D5, Ho Chi Minh City, Vietnam.
Environ Sci Pollut Res Int. 2019 Apr;26(10):9536-9551. doi: 10.1007/s11356-019-04355-3. Epub 2019 Feb 6.
Can Gio district is located in the coastal area of Ho Chi Minh City, southern Vietnam. Discharge of wastewater from Ho Chi Minh City and neighboring provinces to the rivers of Can Gio has led to concerns about the accumulation of trace metals (As, Cu, Cr, Ni, Pb, and Zn) in the coastal sediments. The main objective of this study was to assess the distribution of As, Cu, Cr, Ni, Pb, and Zn in surface and core sediments and to evaluate the contamination status in relation to local background values, as well as the potential release of these selected trace metals from sediments to the water environment. Sediment characteristization, including determination of fine fraction, pH, organic matter, and major elements (Al, Fe, Ca, K, Mg, and S), was carried out to investigate which parameters affect the trace metal enrichment. Fine fraction and Al contents were found to be the controlling proxies affecting the distribution of trace metals while other sediment characteristics did not show any clear influence on trace metals' distribution. Although As concentrations in the sediments were much higher compared to its reference value in other areas, the enrichment factor based on local background values suggests minor contamination of this element as well as for Cr, Cu, and Pb. Risk assessment suggested a medium to very high risk of Mn, Zn, and Ni under acidification. Of importance is also that trace metals in sediments were not easily mobilized by organic complexation based on their low extractabilities by ammonium-EDTA extraction.
戈江区位于越南南部胡志明市的沿海地区。胡志明市和邻近省份的废水排入戈江河流，导致人们对沿海沉积物中痕量金属（砷、铜、铬、镍、铅和锌）的积累产生担忧。本研究的主要目的是评估砷、铜、铬、镍、铅和锌在表层和柱状沉积物中的分布，并根据当地背景值评估其污染状况，以及这些选定的痕量金属从沉积物向水环境释放的潜力。进行了沉积物特征描述，包括细颗粒、pH 值、有机质和主要元素（铝、铁、钙、钾、镁和硫）的测定，以研究哪些参数影响痕量金属的富集。发现细颗粒和铝含量是影响痕量金属分布的控制指标，而其他沉积物特征对痕量金属的分布没有明显影响。虽然沉积物中的砷浓度远高于其他地区的参考值，但基于当地背景值的富集因子表明，该元素以及铬、铜和铅的污染程度较轻。风险评估表明，在酸化条件下，锰、锌和镍的风险处于中等至非常高的水平。同样重要的是，根据铵-EDTA 提取的痕量金属低提取率，沉积物中的痕量金属不易通过有机络合作用迁移。
