National Research and Development Institute for Cryogenics and Isotopic Technologies - ICSI Rm, Valcea, 4 Uzinei Street, 240050, Rm. Valcea, Valcea, Romania.
National Research and Development Institute for Forestry "Marin Drăcea" Calea Bucovinei, 73 Bis, 725100, Câmpulung Moldovenesc, Romania.
Environ Pollut. 2020 Dec;267:115505. doi: 10.1016/j.envpol.2020.115505. Epub 2020 Aug 28.
The concentrations of twelve heavy metals and trace elements (Cr, Mn, Co, Ni, Cu, As, Cd, Pb, Hg, Zn, Fe, and Al) in bed sediment and river freshwater that received sewage discharge, industrial wastewater inputs and mining residue were discussed. Spatial distribution, intra-annual trends and diffuse flux in 2019 in the middle and lower reaches of Olt River Basin (ORB) were investigated using inductively coupled mass spectrometry (ICP-MS) and atomic absorption spectroscopy (AAS). We applied correlation and principal component analysis (PCA) to quantify metal distribution relationship within environmental factors (pH, air temperature) and organic matter existing in the ORB. Moreover, the Sr/Sr and Pb/Pb isotope ratios analysis was employed to conclude the possible origin of the contamination. PCA analysis categorized metal presence in the four-component model, which explains 91% (May), 92% (July) and 93% (September) of the variance and indicates the potential origins of pollutants. The HCA and correlation analysis emphasized the relationship between trace elements, heavy metals in water and sediments and physicochemical characteristics of water. It was observed a high discrepancy in metal distribution between riverbed sediments and water body. In September, correlation indices highlighted sparse positive relationship with trace elements in water and mainly negative correlation values with trace elements from sediments. The origin of pollutants in sediments and water appear to be both natural and human-related activities. In all seasons increased the total exchangeable concentration of Ni, Cu and Zn in the sediments downstream sewage treatment plants and upstream of dams. The consideration of environmental factors and physicochemical characteristics of water is required to develop strategies for pollution management, assessment and mitigation in the actual condition of climate change. This study evaluated the heavy metals pollution in the Olt River Basin over three periods in 2019 under human-induced changes.
本文讨论了接收污水排放、工业废水输入和采矿残渣的床沉积物和河流水体中 12 种重金属和微量元素（Cr、Mn、Co、Ni、Cu、As、Cd、Pb、Hg、Zn、Fe 和 Al）的浓度。使用电感耦合质谱（ICP-MS）和原子吸收光谱（AAS）研究了 2019 年奥尔特河流域中下游的空间分布、年内趋势和漫射通量。我们应用相关性和主成分分析（PCA）来量化环境因素（pH 值、空气温度）和奥尔特河流域有机物中金属分布的关系。此外，还采用 Sr/Sr 和 Pb/Pb 同位素比分析来推断污染的可能来源。PCA 分析将金属分为四组分模型，解释了 91%（5 月）、92%（7 月）和 93%（9 月）的方差，并表明了污染物的潜在来源。层次聚类分析（HCA）和相关性分析强调了水和沉积物中微量元素、重金属与水质理化特性之间的关系。观察到河床沉积物和水体之间金属分布存在较大差异。9 月，相关指数突出了与水中微量元素稀疏的正相关关系，主要与沉积物中微量元素呈负相关关系。沉积物和水中污染物的来源似乎既有自然的也有人为的活动。在所有季节，污水处理厂下游和水坝上游的沉积物中 Ni、Cu 和 Zn 的总可交换浓度都有所增加。在气候变化的实际情况下，需要考虑环境因素和水质理化特性，以制定污染管理、评估和缓解策略。本研究评估了 2019 年奥尔特河流域三个时期人为变化下的重金属污染。
