Li Tongtong, Lan Jing, Wang Yaoyao, Sun Lulu, Li Yaru, Zhao Zongshan
College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China.
Environ Geochem Health. 2024 May 2;46(6):185. doi: 10.1007/s10653-024-01961-0.
Microplastics (MPs), as emerging contaminants, usually experience aging processes in natural environments and further affect their interactions with coexisted contaminants, resulting in unpredictable ecological risks. Herein, the effect of MPs aging on their adsorption for coexisting antibiotics and their joint biotoxicity have been investigated. Results showed that the adsorption capacity of aged polystyrene (PS, 100 d and 50 d) for ciprofloxacin (CIP) was 1.10-4.09 times higher than virgin PS due to the larger BET surface area and increased oxygen-containing functional groups of aged PS. Following the increased adsorption capacity of aged PS, the joint toxicity of aged PS and CIP to Shewanella Oneidensis MR-1 (MR-1) was 1.03-1.34 times higher than virgin PS and CIP. Combined with the adsorption process, CIP posed higher toxicity to MR-1 compared to aged PS due to the rapid adsorption of aged PS for CIP in the first 12 h. After that, the adsorption process tended to be gentle and hence the joint toxicity to MR-1 was gradually dominated by aged PS. A similar transformation between the adsorption rate and the joint toxicity of PS and CIP was observed under different conditions. This study supplied a novel perception of the synergistic effects of PS aging and CIP on ecological health.
微塑料（MPs）作为新兴污染物，通常在自然环境中经历老化过程，并进一步影响它们与共存污染物的相互作用，从而产生不可预测的生态风险。在此，研究了微塑料老化对其对共存抗生素的吸附及其联合生物毒性的影响。结果表明，老化的聚苯乙烯（PS，分别老化100天和50天）对环丙沙星（CIP）的吸附能力比原始PS高1.10至4.09倍，这是由于老化PS的BET表面积更大且含氧官能团增加。随着老化PS吸附能力的提高，老化PS和CIP对希瓦氏菌MR-1（MR-1）的联合毒性比原始PS和CIP高1.03至1.34倍。结合吸附过程来看，由于老化PS在最初12小时内对CIP的快速吸附，CIP对MR-1的毒性比老化PS更高。在此之后，吸附过程趋于平缓，因此对MR-1的联合毒性逐渐由老化PS主导。在不同条件下观察到PS和CIP的吸附速率与联合毒性之间存在类似的转变。本研究为PS老化和CIP对生态健康的协同效应提供了新的认识。
