Laboratory of Biomarkers of Aquatic Contamination and Immunochemistry-LABCAI, Federal University of Santa Catarina, UFSC, Florianópolis, SC, 88037-000, Brazil.
Aquaculture Pathology Research Center-NEPAQ, Federal University of Santa Catarina, UFSC, Florianópolis, SC, 88034-257, Brazil.
Chemosphere. 2022 Nov;307(Pt 4):136039. doi: 10.1016/j.chemosphere.2022.136039. Epub 2022 Aug 16.
The levels of linear alkylbenzenes (LABs) and the occurrence of microplastics (MPs) in the oysters Crassostrea gigas were evaluated in six farming areas in southern Brazil. The results revealed higher concentrations of LABs in oyster tissue from the Serraria (1977 ± 497.7 ng g) and Imaruim (1038 ± 409.9 ng g) sites. Plastic microfibers were found in oysters from all locations with values from 0.33 to 0.75 MPs per oyster (0.27-0.64 MPs per gram) showing the ubiquitous presence of this contaminant in the marine environment, which could be considered a threat to farming organisms. In addition, elements such as Ti, Al, Ba, V, Rb, Cr, and Cu were found in the chemical composition of the microfibers, suggesting MPs as vectors of inorganic compounds. A positive correlation between LABs and thermotolerant coliforms suggests that sewage discharges are the main source of contamination in these oysters cultured for human consumption. The present study highlights the need for efficient wastewater treatment plants and the implementation of depuration techniques in oysters from farming areas.
本研究评估了巴西南部六个养殖区牡蛎（Crassostrea gigas）体内线性烷基苯（LABs）的水平和微塑料（MPs）的存在情况。结果表明，来自塞拉里亚（Serraria）（1977±497.7ng/g）和伊马鲁姆（Imaruim）（1038±409.9ng/g）地点的牡蛎组织中 LABs 浓度较高。在所有地点的牡蛎中都发现了塑料微纤维，每个牡蛎的含量从 0.33 到 0.75 MPs（每克 0.27-0.64 MPs），表明这种污染物在海洋环境中无处不在，这可能对养殖生物构成威胁。此外，微纤维的化学成分中还发现了 Ti、Al、Ba、V、Rb、Cr 和 Cu 等元素，表明 MPs 是无机化合物的载体。LABs 与耐热大肠菌群之间存在正相关关系，这表明污水排放是这些用于人类食用的牡蛎受到污染的主要来源。本研究强调了需要在养殖区建立高效的污水处理厂和实施牡蛎净化技术。
