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Distribution and dispersal of metals in contaminated fibrous sediments of industrial origin

机译：金属在工业来源的污染纤维状沉积物中的分布和扩散

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Industrial emissions can impact aquatic environments and unregulated discharges from pulp and paper factories have resulted in deposits of cellulose fiber along the Swedish coast. These deposits are contaminated by metals, but due to their unique fibrous character the extent of sorption and dispersal of the metals is unclear. Fibrous sediments were sampled at two sites in the Angermanalven river estuary, Sweden. The partitioning of metals between the sediment, pore water and bottom water was investigated and the degree of bioavailability was evaluated. The levels of metals in the sediment were high in fibrous or offshore samples, depending on the metal, whereas the levels of dissolved metals in pore water were low or below the limit of quantification. Partition coefficients (K-D) showed that sorption to the sediment was stronger at one of the fibrous sites, possibly related to the type and size of organic matter. Undisturbed bottom water samples contained low levels of both dissolved and particle bound metals, but when comparing measured metal concentrations to threshold values of ecological status and ecotoxicological assessment criteria, both sediments and bottom water may be detrimental to living organisms. In-situ re-suspension experiments showed that the concentrations of particle bound metals increased whereas the dissolved concentrations decreased. The analyzed metals are probably retained by the solid phases of the fibrous sediment or adsorbed to particles in the water, reducing their bioavailability. (C) 2018 The Authors. Published by Elsevier Ltd.
机译：工业排放会影响水生环境，纸浆和造纸厂的不规则排放已导致瑞典沿岸的纤维素纤维沉积。这些沉积物被金属污染，但是由于其独特的纤维特性，金属的吸附和分散程度尚不清楚。在瑞典Angermanalven河口的两个地点取样了纤维状沉积物。研究了沉积物，孔隙水和底部水之间金属的分配，并评估了生物利用度。取决于金属，纤维状或近海样品中沉积物中的金属含量较高，而孔隙水中溶解的金属含量较低或低于定量极限。分配系数（K-D）表明，在其中一个纤维部位对沉积物的吸附更强，这可能与有机物的类型和大小有关。不受干扰的底水样品中的溶解金属和颗粒结合金属含量均较低，但将测得的金属浓度与生态状况和生态毒理学评估标准的阈值进行比较时，沉积物和底水均可能对生物体有害。原位重悬实验表明，颗粒结合金属的浓度增加，而溶解的浓度减少。被分析的金属可能被纤维状沉积物的固相保留，或被吸附到水中的颗粒上，从而降低了它们的生物利用度。 （C）2018作者。由Elsevier Ltd.发布

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