Distribution, sources and ecological risk assessment of metals in Kura river sediments along a human disturbance gradient

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-07-09 DOI:10.1080/15275922.2021.1940378

Serkan Kükrer, İ. Tunç, A. E. Erginal, Ozender Bay, Ş. Kılıç

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引用次数: 6

Abstract

Abstract Monitoring the pollution status of freshwater resources is an important step in sustainable planning. This study aimed to determine the distribution and sources of metals in the sediments of the transboundary eastern Anatolian/Caucasus region Kura river as well as its ecological risk level. Surface sediment samples were collected from eight sites along the human disturbance gradient. Multi-element analyses of the collected samples were performed using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Chlorophyll degradation product (CDP) analysis was performed spectrophotometrically. OC analysis was carried out using the titration method. The data obtained were evaluated using the indices of enrichment factor, geo-accumulation, modified hazard quotient and ecological contamination index and potential ecological risk. The average content of metals in the sediment at the eight sites was of the following descending order from highest to lowest: Al > Mn > Zn > V> Ni > Cr > Cu > Co > Pb > As > Cd > Tl > Hg. According to the distribution of raw metal values, urbanization is not the only factor controlling metal distribution. Adsorption processes and organic material content also emerge as an important factor. Enrichment factor values were of the following order: T1 > Pb > Mn > Hg > Cr > Co > Cd > Ni > As > Zn > Al > Cu > V. Results revealed that the sources of Cu, V and Al were lithogenic, in contrast to Tl, Pb, Mn, Hg, Cr, Co, Cd, Ni, and As, thus pointing to human-induced accumulation. According to the potential ecological risk index, these elements have the potential to create medium-to-high level ecological risks and were substantially of atmospheric origin. The ecological contamination index is also consistent with these findings in terms of risk level. A municipal waste stream, fossil fuel burning and a cement plant operating in close proximity also appeared to be the possible sources.

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库拉河沿人为干扰梯度沉积物中金属的分布、来源及生态风险评价

摘要淡水资源污染状况监测是可持续规划的重要环节。本研究旨在确定跨界东安纳托利亚/高加索地区库拉河沉积物中金属的分布、来源及其生态风险水平。沿人为干扰梯度在8个地点采集了地表沉积物样本。采用电感耦合等离子体质谱(ICP-MS)对样品进行多元素分析。采用分光光度法分析叶绿素降解产物(CDP)。用滴定法进行OC分析。利用富集系数、地质累积、修正危害商、生态污染指数和潜在生态风险等指标对数据进行评价。8个地点沉积物中金属平均含量由高到低依次为Al > Mn > Zn > V> Ni > Cr > Cu > Co > Pb > As > Cd > Tl > Hg。从金属原价分布来看，城市化并不是控制金属原价分布的唯一因素。吸附过程和有机物含量也成为重要的影响因素。富集因子值以下的顺序:T1 > >铅>锰>汞、铬>有限公司> Cd >镍> >锌> >铜> V。结果表明，Cu、V和Al的来源为岩石成因，而Tl、Pb、Mn、Hg、Cr、Co、Cd、Ni和As的来源为人为积累。根据潜在生态风险指数，这些要素具有产生中高水平生态风险的潜力，主要来源于大气。生态污染指数在风险水平上也与研究结果一致。城市垃圾流、化石燃料燃烧和附近的水泥厂似乎也是可能的来源。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.