The influence of the quantity and quality of sediment organic matter on the potential mobility and toxicity of trace elements in bottom sediment
Agnieszka Baran , Monika Mierzwa-Hersztek , Krzysztof Gondek , Marek Tarnawski , Magdalena Szara , Olga Gorczyca , Tomasz Koniarz
AbstractKnowledge on the fraction of trace elements in the bottom sediments is a key to understand their mobility and ecotoxicological impact. The purpose of this study was to assess the influence of the content of organic matter fractions on the mobility and ecotoxicity of trace elements in sediments from the Rybnik reservoir. The most refractory fraction of organic matter—Cnh (non-hydrolysing carbon)—dominated in the sediments. The content of organic matter fractions are arranged in the following order: Cnh (non-hydrolysing carbon) > Cfa (fulvic acid) > Cha (humic acid) > DOC (dissolved organic carbon). On the other hand, the highest value of correlation coefficients was found for different fractions of trace elements and DOC content in the bottom sediments. A higher content of TOC in the sediments significantly increased the share of elements in the potential mobile fraction and, at the same time, decreased the binding of elements in the mobile fractions. Moreover, in sediments that contain more than 100 g/kg d.m. TOC, no and medium risk of trace element release from sediments was observed. The Cu, Cd and Ni were potentially the most toxic elements for biota in the Rybnik reservoir. However, the correlation between the content of trace elements and the response of bacteria was insignificant. These results suggested that the complexation of trace elements with organic matter makes them less toxic for Vibrio fischeri. The transformation and sources of organic matter play an important role in the behaviour of trace elements in the bottom sediments of the Rybnik reservoir.
|Journal series||Environmental Geochemistry and Health, ISSN 0269-4042, e-ISSN 1573-2983, (N/A 100 pkt)|
|Publication size in sheets||0.85|
|Keywords in English||Bottom sediments, Trace elements, Fraction of organic matter, Mobility, Toxicity|
|ASJC Classification||; ; ; ; ;|
|License||Journal (articles only); author's original; ; after publication|
|Publication indicators||= 0; : 2018 = 1.184; : 2018 = 3.252 (2) - 2018=3.282 (5)|
|Citation count*||7 (2020-08-11)|
|Finansowanie||The study was financed by Grant No. 2016/21/B/ST10/02127: “Assessment of the bottom sediment organic matter on bioavailability and toxicity of chemical compounds” provided by the National Science Centre, Poland.|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.