College of Geography and Environmental Science, Guizhou Normal University, Guiyang, 550025, China.
Cultivation Base of Guizhou State Key Laboratory of Karst Mountain Ecological Environment, Guiyang, 550025, China.
Environ Sci Pollut Res Int. 2023 May;30(25):66625-66637. doi: 10.1007/s11356-023-27139-2. Epub 2023 Apr 26.
The widespread use of nanoparticles (NPs) and organic pollutants increases the risk of their coexistence in the aquatic environments. It is uncertain how the combined toxicities of NPs and OCs affect aquatic organisms in surface waters. In this study, the binary combined toxicities of TiO NPs with three different organochlorines (OCs)-pentachlorobenzene (PeCB), 3,3,4,4-tetrachlorobiphenyl (PCB-77), and atrazine on Chlorella pyrenoidosa in three karst surface water bodies were investigated. The correlation analysis results indicated that the toxicities of TiO NPs and OCs to algae were mainly related to the total organic carbon (TOC) and ionic strength of surface water. Surface water relieved the growth inhibition of the pollutants on algae as compared with ultrapure water (UW). The combined toxic effect caused by the co-exposure of TiO NPs-atrazine was synergistic and had an antagonistic effect for TiO NPs-PCB-77 in four types of water bodies. However, the co-exposure of TiO NPs-PeCB had an additive effect in the Huaxi Reservoir (HX) and synergistic effects in Baihua Lake (BH), Hongfeng Lake (HF), and UW. TiO NPs increased the bioaccumulation of OCs by algae. Both PeCB and atrazine significantly increased the bioaccumulation of TiO NPs by algae, except for PeCB in HX; however, PCB-77 reduced the bioaccumulation of TiO NPs by algae. The toxic effects of TiO NPs and OCs on algae in different water bodies were the result of the nature of the pollutants, bioaccumulation, hydrochemical properties, and other factors.
纳米颗粒（NPs）和有机污染物的广泛使用增加了它们在水生环境中共存的风险。目前还不确定 NPs 和 OCs 的联合毒性如何影响地表水的水生生物。在这项研究中，研究了三种不同有机氯农药（OCs）-五氯苯（PeCB）、3,3,4,4-四氯联苯（PCB-77）和莠去津与 TiO2 NPs 在三个喀斯特地表水体中的组合毒性对栅藻的影响。相关分析结果表明，TiO2 NPs 和 OCs 对藻类的毒性主要与地表水的总有机碳（TOC）和离子强度有关。与超纯水（UW）相比，地表水缓解了污染物对藻类的生长抑制作用。TiO2 NPs-莠去津的联合毒性效应是协同的，而 TiO2 NPs-PCB-77 在四种水体中则是拮抗的。然而，TiO2 NPs-PeCB 在华西水库（HX）中具有加性效应，在百花湖（BH）、红枫湖（HF）和 UW 中具有协同效应。TiO2 NPs 增加了藻类对 OCs 的生物累积。除了 HX 中的 PeCB 之外，PeCB 和莠去津均显著增加了藻类对 TiO2 NPs 的生物累积，而 PCB-77 则降低了藻类对 TiO2 NPs 的生物累积。不同水体中 TiO2 NPs 和 OCs 对藻类的毒性效应是污染物性质、生物累积、水化学性质等因素共同作用的结果。
