Cao Zhihan, Kim Changhae, Song Jinyoung, Li Zhihua, Jung Jinho
Division of Environmental Science and Ecological Engineering, Korea University, Seoul, 02841, Republic of Korea.
Exposure & Toxicology Research Center, Korea Institute of Toxicology, Jinju, 52834, Republic of Korea.
Bull Environ Contam Toxicol. 2025 Jan 20;114(2):18. doi: 10.1007/s00128-024-03995-7.
The adverse effect of chemical additives leaching from microplastics (MPs) on Daphnia magna populations is not fully understood. In this study, D. magna populations were exposed to polyethylene (PE) MP fragments (5.0 mg/L), PE MP fragments containing the ultraviolet stabilizer benzophenone-3 (MP/BP-3 fragments, 5.0 mg/L), and BP-3 leachate (79 ± 10 µg/L) from PE MP/BP-3 fragments. The test duration was 42 days to observe the population dynamics of D. magna. BP-3 leachate delayed the development and somatic growth of D. magna, resulting in a significantly lower (p < 0.05) population size (number of organisms) compared with the control group. For instance, the population size was 7.7 ± 8.1 and 115 ± 3.5 (n = 3), respectively, at 18 d. However, both MP and MP/BP-3 fragments did not significantly decrease (p > 0.05) the population size of D. magna until day 18. These findings suggest that chemical additive leachates from MPs may have a distinct adverse effect on aquatic organisms, requiring further comprehensive investigation.
微塑料（MPs）中化学添加剂的浸出对大型溞种群的不利影响尚未完全了解。在本研究中，大型溞种群分别暴露于聚乙烯（PE）微塑料碎片（5.0毫克/升）、含有紫外线稳定剂二苯甲酮-3的PE微塑料碎片（MP/BP-3碎片，5.0毫克/升）以及来自PE MP/BP-3碎片的BP-3浸出液（79±10微克/升）中。试验持续42天以观察大型溞的种群动态。BP-3浸出液延迟了大型溞的发育和体细胞生长，导致与对照组相比种群数量显著降低（p<0.05）。例如，在第18天时，种群数量分别为7.7±8.1和115±3.5（n=3）。然而，直到第18天，MP和MP/BP-3碎片均未显著降低（p>0.05）大型溞的种群数量。这些发现表明，微塑料中的化学添加剂浸出液可能对水生生物有明显的不利影响，需要进一步全面调查。
