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首页> 外文期刊>Estuarine Coastal and Shelf Science >Ecological risk assessment of the Assaluyeh and Bassatin estuaries (northern Persian Gulf) using sediment quality indices
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Ecological risk assessment of the Assaluyeh and Bassatin estuaries (northern Persian Gulf) using sediment quality indices

机译：利用沉积物质量指数评估Assaluyeh和Bassatin口（北波斯湾）的生态风险

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The Assaluyeh and Bassatin estuaries are located in Nayband Bay in the northern Persian Gulf, which faces long-term contamination and ecological risks. The research objectives of this study were designed to assess the ecological risks for human health and aquatic life and to evaluate impacts on environmental changes. Accordingly, an index analysis approach (using the contamination factor Cf, contamination degree Cd, potential ecological risk factor for individual metals Er, and potential ecological risk index for the basin, RI) in conjunction with the enrichment factor (E-f) and sediment quality levels (comprised of the threshold effect level, TEL, the probable effect level, PEL and the effects range medium, ERM) were employed. In total, 147 sediment samples were tested to determine the content of organic matter and sulfur, as well as the concentrations of terrestrial and rare earth elements (REEs) and toxic metals, namely As, Cd, Cr, Cu, Ni and Hg, using inductively coupled plasma optical emission spectroscopy (ICP-OES). Gulf War oil spills in addition to oil and gas industries of the Pars South Especial Economic Zone (PSEEZ) were identified as the primary source of pollution in the study area. Gulf War contamination in the study area is highlighted by increased levels of Cd and RI at key horizons at 29 cm, 35 cm and 49 cm depth in the sedimentary columns of the Assaluyeh and Bassatin estuaries and Gavbandi River, respectively. Adverse effects of PSEEZ were revealed by increasing concentrations of toxic metals, P and S in the top 25-30 cm of the sedimentary columns. As a result, superficial sediments have been severely polluted by As, Ni, Cd, Cu and Cr, while the entire sedimentary column of the Assaluyeh estuary has been polluted by Hg. Based on the locations of the key horizons, the sedimentation rates of the previous decade at the Assaluyeh and Bassatin estuaries and the Gavbandi River were calculated to be 1.26 cm, 1.52 cm, and 2.13 cm, respectively. The capability of the index analysis approach, as well as of certain lanthanides, for highlighting environmental evolutionary trends in catchments in which extensive land use changes have occurred was demonstrated by the present investigation. The present research concluded that aquatic life and human health in the study area have been subjected to different ranges of hazards by toxic metals due to regional and local anthropogenic activities. (C) 2017 Elsevier Ltd. All rights reserved.
机译：Assaluyeh河口和Bassatin河口位于波斯湾北部的内班德湾，面临长期的污染和生态风险。本研究的研究目标旨在评估对人类健康和水生生物的生态风险，并评估对环境变化的影响。因此，结合富集因子（Ef）和沉积物质量水平，采用指数分析方法（使用污染因子Cf，污染度Cd，单个金属Er的潜在生态风险因子以及盆地RI的潜在生态风险指数） （由阈值效应水平，TEL，可能效应水平，PEL和效应范围中等，ERM组成）使用。总共对147个沉积物样品进行了测试，以确定有机物和硫的含量，以及使用As，Cd，Cr，Cu，Ni和Hg的有毒金属，稀土元素和稀土元素（REE）的浓度。电感耦合等离子体发射光谱（ICP-OES）。除了帕尔斯南部特别经济区（PSEEZ）的石油和天然气工业外，海湾战争的石油泄漏被确定为研究区域的主要污染源。研究区的海湾战争污染在Assaluyeh和Bassatin河口和Gavbandi河的沉积柱中，分别在29 cm，35 cm和49 cm深度的关键层中镉和RI含量增加，突显了这一点。通过增加沉积柱顶部25-30 cm中的有毒金属，P和S的浓度可以揭示PSEEZ的不利影响。结果，表层沉积物已被砷，镍，镉，铜和铬严重污染，而阿萨鲁耶河口的整个沉积柱均被汞污染。根据关键层位的位置，过去十年中在Assaluyeh和Bassatin入海口以及Gavbandi河的沉积率分别为1.26 cm，1.52 cm和2.13 cm。本次调查证明了指数分析方法以及某些镧系元素突出流域环境变化趋势的能力，在流域中发生了广泛的土地利用变化。本研究得出的结论是，由于区域和地方的人为活动，有毒金属对研究区域的水生生物和人类健康造成了不同程度的危害。 （C）2017 Elsevier Ltd.保留所有权利。

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