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首页> 外文期刊>Journal of soils & sediments >An assessment of the concentrations of PCDDs/Fs in contaminated bottom sediments and their sources and ecological risk
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An assessment of the concentrations of PCDDs/Fs in contaminated bottom sediments and their sources and ecological risk

机译：评估污染底部沉积物中PCDDS / FS浓度及其来源和生态风险

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Purpose The purpose of the study was to determine the levels of polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran (PCDD/F), two types of persistent organic pollutant (POP), in an urban retention reservoir located in an industrial zone within a coal-mining region. It also assesses the potential ecological risk of the PCDDs/Fs present in bottom sediments and the relationship between their content and the fraction of organic matter. Materials and methods The sediment samples were collected from Rybnik Reservoir, located in the centre of the Rybnik Coal Region, Silesia, one of Poland's major industrial centres. Seventeen PCDD/F congeners in the surface of the sediments were analysed using high-resolution gas chromatography and high-resolution mass spectrometry (HRGC/HRMS). Results and discussion The toxic equivalency (TEQ) of the PCDDs/Fs in the sediments ranged from 1.65 to 32.68 pg TEQ g(-1). PCDDs constituted 59-78% of the total PCDDs/Fs, while the PCDFs accounted for 22-41%. The pattern of PCDD/F congeners in the sediments was dominated by OCDD. However, the second-most prevalent constituents were OCDF and n-ary sumation HpCDFs in the low TOC sediment ( 10 g TOC kg(-1)), but HpCDD in the rich TOC samples ( 10 g TOC kg(-1)). PCDD/F concentrations in the sediment samples were 2- to 38-fold higher than the sediment quality guidelines limit, indicating high ecological risk potential. Although a considerable proportion of PCDDs/Fs in the bottom sediments from the Rybnik Reservoir were derived from combustion processes, they were also obtained via transport, wastewater discharge, high-temperature processes and thermal electricity generation. The PCDD/F concentrations were significantly correlated with all fractions of organic matter; however, the strongest correlation coefficients were found between PCDDs/Fs and humic substances. Besides organic matter, the proportions of silt/clay fractions within sediments played an important role in the transport of PCDDs/Fs in bottom sediments. Conclusions The silt/clay fraction of the bottom sediments plays a dominant role in the movement of PCDDs/Fs, while the organic matter fraction affects their sorption. The results indicate that the environmental behaviour of PCDDs/Fs is affected by the quantity and quality of organic matter and the texture of sediments.
机译：目的，该研究的目的是确定在煤炭内的工业区的城市保留水库中，在位于煤炭内的工业区的城市保留水库中，确定多氯二苯甲酰-P-二恶英和多氯二苯甲菌（PCDD / F）的水平，这两种类型的持久性有机污染物（Pop） - 在线区域。它还评估了底部沉积物中存在的PCDDS / FS的潜在生态风险以及其含量与有机物质的一部分之间的关​​系。材料和方法从Rybnik储层收集了沉积物样品，位于波兰主要工业中心之一的瑞萨煤区中心的Rybnik煤区中心。使用高分辨率气相色谱法和高分辨率质谱（HRGC / HRMS）分析沉积物表面中的17个PCDD / F同型。结果与讨论沉积物中PCDDS / FS的有毒等效（TEQ）的范围为1.65至32.68 pg teq g（-1）。 PCDDS构成总PCDDS / FS的59-78％，而PCDFS占22-41％。沉积物中PCDD / F的图案由OCDD主导。然而，第二次普遍的成分是低TOC沉积物中的OCDF和N-ARY SUMATION HPCDF（<10g TOC kg（-1）），但富集TOC样品中的HPCDD（> 10g TOC kg（-1） ）。沉积物样品中的PCDD / F浓度比沉积物质量指南限制高2至38倍，表明高生态风险潜力。尽管来自Rybnik储层的底部沉积物中的相当大比例的PCDDS / FS来自燃烧过程，但它们也通过运输，废水排放，高温工艺和热发电获得。 PCDD / F浓度与有机物的所有部分显着相关;然而，在PCDDS / FS和腐殖质之间发现了最强的相关系数。除有机物质外，沉积物中淤泥/粘土级分的比例在底部沉积物中的PCDDS / FS运输中发挥了重要作用。结论底部沉积物的淤泥/粘土分数在PCDDS / FS的运动中起着显着作用，而有机物馏分影响其吸附。结果表明，PCDDS / FS的环境行为受到有机物质数量和质量的影响和沉积物的质量。

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