TRACE METAL ENVIRONMENTAL CONTAMINATION RECORDS IN CORE SEDIMENTS OF GORGAN BAY IN THE SOUTHEAST OF THE CASPIAN SEA

IF 0.6 4区环境科学与生态学 Q4 ECOLOGY

Applied Ecology and Environmental Research Pub Date : 2019-01-12 DOI:10.15666/aeer/1704_95479559

H. Bagheri, M. H. M. Gharaie, Sayyed Reza Moussavi Harami, M. Khanehbad

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引用次数: 2

Abstract

In this study five sedimentary cores were collected from Gorgan Bay (southeastern part of the Caspian Sea). Concentrations of elements were measured to determine depositional trends and geostatistical assessment of toxic elements was carried out. Al, Fe, K, Mg, Na and S content increased in all 5 cores, from the bottom to near the top layer, with maximum concentrations at 15–45 cm depths. However, for the toxic elements, maximum concentration of As, Cr, Cu, Pb, Zn, Co and Ni varied in different depth of 5-15 cm and 80-120 cm. Enrichment factors (EFs) and pollution load index (PLI) were calculated to assess the enrichment and pollution of heavy elements in the bay sediments. Except for Ca and S, all studied elements showed positive and significant correlations with Fe and Al, which indicate the same source (human or natural). Principal component analysis (PCA) indicated that sediments were influenced by both geologic and anthropogenic impacts. According to the EFs, most toxic elements showed no significant enrichment and no pollution in the core sediments. Based on PLI average value in all cores, the southeast coast of the Caspian Sea (Gorgan Bay) should be classified as not metal polluted, but in recent decades there has been a dramatic increase of toxic elements that needs more attention and also

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里海东南部戈尔根湾岩心沉积物痕量金属环境污染记录

本研究在里海东南部的戈尔根湾采集了5个沉积岩心。测量了元素浓度以确定沉积趋势，并对有毒元素进行了地质统计评估。5个岩心中Al、Fe、K、Mg、Na和S的含量均呈自下而上向近顶层上升的趋势，在15 ~ 45 cm处浓度最高。而有毒元素As、Cr、Cu、Pb、Zn、Co、Ni的最大浓度在5 ~ 15 cm和80 ~ 120 cm不同深度存在差异。通过计算富集因子(EFs)和污染负荷指数(PLI)来评价海湾沉积物中重元素的富集和污染程度。除Ca、S外，其余元素均与Fe、Al呈显著正相关，表明来源相同(人为或自然)。主成分分析(PCA)表明，沉积物受到地质和人为双重影响。结果表明，大多数有毒元素在岩心沉积物中没有明显富集，也没有污染。根据各岩心的PLI平均值，里海东南海岸(戈尔根湾)应被归类为非金属污染，但近几十年来，有毒元素急剧增加，需要引起更多的关注和重视

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来源期刊

Applied Ecology and Environmental Research ECOLOGY-ENVIRONMENTAL SCIENCES

CiteScore

1.40

自引率

14.30%

发文量

104

审稿时长

14 months

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