Water Pollution Ecology Laboratory, College of Life Sciences, Wuhan University, Wuhan, 430072, People's Republic of China.
Huazhong Pharmaceutical Co., Ltd, Xiangyang, 441002, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Nov;29(52):78913-78925. doi: 10.1007/s11356-022-21164-3. Epub 2022 Jun 14.
Cadmium (Cd) is considered a priority pollutant, and nonylphenol (NP) is a common organic pollutant in water environments. However, the ecological risks of combined Cd and NP pollution have not been fully elucidated. In this study, the effects of Cd, NP, and Cd-NP on the growth and physiology of Hydrocharis dubia (Bl.) Backer were studied. The results indicated that Cd-NP joint toxicity is concentration-dependent. The joint toxicity of Cd and NP on H. dubia was antagonistic when the concentrations of Cd + NP were 0.01 + 0.1/1 mg/L. At 0.5 + 0.1/1 mg/L, Cd and NP had a strong synergistic effect on H. dubia. In addition, plant growth was significantly inhibited, and the chlorophyll contents were significantly reduced under Cd, NP, or Cd-NP exposure. The plant's antioxidant enzyme system was destroyed. The activities of superoxide dismutase (SOD) and catalase (CAT) were significantly decreased under NP-only exposure. The activity of SOD was significantly decreased under Cd-only and under joint exposure. Compound pollution exceeded the oxidative defense capacity of the plants, so the HO content increased significantly. Our results indicated that the ecotoxicity of NP combined with Cd may be exacerbated in aquatic environments and cause obvious damage to H. dubia.
镉（Cd）被认为是优先污染物，壬基酚（NP）是水环境中常见的有机污染物。然而，Cd 和 NP 联合污染的生态风险尚未得到充分阐明。本研究探讨了 Cd、NP 及 Cd-NP 对凤眼莲（Hydrocharis dubia (Bl.) Backer）生长和生理的影响。结果表明，Cd-NP 联合毒性具有浓度依赖性。当 Cd+NP 浓度为 0.01+0.1/1mg/L 时，Cd 和 NP 对凤眼莲的联合毒性表现为拮抗作用。当浓度为 0.5+0.1/1mg/L 时，Cd 和 NP 对凤眼莲具有很强的协同作用。此外，在 Cd、NP 或 Cd-NP 暴露下，植物生长受到明显抑制，叶绿素含量显著降低。植物抗氧化酶系统受到破坏。仅 NP 暴露时，超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性显著降低。仅 Cd 暴露和联合暴露时，SOD 活性显著降低。复合污染超过了植物的氧化防御能力，因此 HO 含量显著增加。我们的结果表明，NP 与 Cd 联合可能会加剧水生环境中的生态毒性，对凤眼莲造成明显损害。
