Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland.
Department of Agricultural and Environmental Chemistry, University of Agriculture in Krakow, al. Mickiewicza 21, Krakow, Poland.
Chemosphere. 2022 Jan;287(Pt 4):132366. doi: 10.1016/j.chemosphere.2021.132366. Epub 2021 Sep 28.
The sorption mechanisms of the trace elements in bottom sediment are not fully understood. The study aim was to analyse the effect sorption capacity of bottom sediments on the content of trace elements and the bottom sediment ecotoxicity. The study found higher content of trace elements caused higher potential toxicity of bottom sediments. However, the PCA analysis indicated that ecotoxicity to Heterocypris incongruens was not related to the trace element content in the sediments. It was found that some of the physicochemical properties of bottom sediments determine the behavior of the test organism. The study revealed a strong relationships between the properties of bottom sediments and trace element sorption, which results from significant differences in the carbonate and organic matter contents. The obtained relationships showed a significant role in trace element sorption of negatively dissociating functional groups (carboxyl, phenolic, alcohol, and carbonyl groups) of Cha, Cfa, Cnh and DOC fraction and of clay minerals. Positive correlation between the metal content and the volume of ultramicropores, cryptopores and residual pores suggest that these pore groups contain reactive sites capable of effective element sorption. In contrast, larger pores turned out to be of marginal importance in trace elements sorption, probably participating only in their migration within the bottom sediment structure. An understanding of the above factors will provide comprehensive information on the fate of trace elements in aquatic systems.
底泥中痕量元素的吸附机制尚未完全阐明。本研究旨在分析底泥的吸附容量对痕量元素含量和底泥生态毒性的影响。研究发现，痕量元素含量越高，底泥的潜在毒性越高。然而，PCA 分析表明，对异盘并殖吸虫的生态毒性与沉积物中的痕量元素含量无关。研究发现，一些底泥的物理化学性质决定了试验生物的行为。研究表明，底泥性质与痕量元素吸附之间存在很强的关系，这是由于碳酸盐和有机质含量的显著差异所致。所获得的关系表明， negatively dissociating functional groups（羧基、酚基、醇基和羰基）、Cha、Cfa、Cnh 和 DOC 分馏物以及粘土矿物对痕量元素吸附具有重要作用。金属含量与超微孔、隐孔和残余孔体积之间存在正相关关系，表明这些孔群含有能够有效吸附元素的反应性位点。相比之下，较大的孔隙在痕量元素的吸附中作用不大，可能只参与了它们在底泥结构中的迁移。了解上述因素将为水生系统中痕量元素的归宿提供全面的信息。
