Department of Environmental and Chemistry Engineering, Faculty of Civil and Environmental Engineering and Architecture, Rzeszów University of Technology, Al. Powstańców Warszawy 6, 35-959, Rzeszów, Poland.
Department of Environmental and Chemistry Engineering, Faculty of Civil and Environmental Engineering and Architecture, Rzeszów University of Technology, Al. Powstańców Warszawy 6, 35-959, Rzeszów, Poland.
Environ Pollut. 2024 Nov 15;361:124811. doi: 10.1016/j.envpol.2024.124811. Epub 2024 Aug 25.
In this article, a multivariate analysis of the parameters determining the transport and fate of selected heavy metals in the water - bottom sediment interface was carried out. The studies were carried out in the summer season of 2019 at Nielisz Reservoir (southeastern Poland, Lublin Voivodeship). Finally, a previously unknown factor related to the quality of organic matter was identified. Autochthonous organic matter was shown to promote the accumulation of the studied heavy metals. To date, the significance of the origin of organic matter in the context of the transport and fate of heavy metals in retention reservoirs has rarely been reported in the scientific literature. More than that, this factor was not considered an important component in the process of heavy metal deposition in bottom sediments. However, it turns out that not only the quantity of organic matter, but also its quality plays an important role in the circulation of heavy metals in retention reservoir ecosystems. It was found that autochthonous organic matter promotes the accumulation of the studied heavy metals. It can be assumed that, in a sense, it plays the role of a catenary ("hub") controlling the fate of heavy metals in the water-sediment system. It has also been conjectured that, in a sense, OM may reflect the potential for heavy metal assimilation by aquatic vascular plants (mainly of the C3 group). Plants with a photosynthetic pathway similar to the C3 group generally have a much lower enrichment in the C isotope (δC from -38‰ to -22‰). In our case, the lowest δC-TOC value was -24.05‰, and the average for the whole reservoir was -21.53‰. In addition, it was observed that quantitative changes in the isotopic composition of total organic carbon δC-TOC, corresponded with changes in the content of the heavy metals studied in entrapped sediments.
本文对决定选定重金属在水-底泥界面输运和归宿的参数进行了多元分析。研究于 2019 年夏季在波兰东南部卢布林省的尼尔利什水库进行。最后，确定了一个以前未知的与有机质质量有关的因素。研究表明，自生有机质促进了所研究重金属的积累。迄今为止，在滞留水库中重金属输运和归宿的背景下，有机质来源的重要性在科学文献中很少被报道。不仅如此，这个因素在底泥中重金属沉积过程中也不被认为是一个重要的组成部分。然而，事实证明，不仅有机质的数量，而且其质量在滞留水库生态系统中重金属的循环中都起着重要作用。研究发现，自生有机质促进了所研究重金属的积累。可以假设，在某种意义上，它起到了控制重金属在水-底泥系统中归宿的连锁（“枢纽”）作用。还有人推测，从某种意义上说，OM 可能反映了水生维管束植物（主要是 C3 组）对重金属同化的潜力。具有与 C3 组相似光合作用途径的植物通常对 C 同位素（δC 从-38‰到-22‰）的富集程度要低得多。在我们的案例中，最低的δC-TOC 值为-24.05‰，整个水库的平均值为-21.53‰。此外，还观察到总有机碳 δC-TOC 的同位素组成的定量变化与截留沉积物中所研究重金属含量的变化相对应。
