Wang Chao, Shi Jiaqi, Liu Kun, Bai Lihua, Qu Changsheng
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, P.R. China.
Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Industry and Information·Technology, Jiangsu Environmental Engineering Technology Co., Ltd, Nanjing, Jiangsu, 210019, China.
Bull Environ Contam Toxicol. 2025 Jan 20;114(2):25. doi: 10.1007/s00128-024-04004-7.
The widespread concern over nanoplastics (NPs) has prompted extensive research into their environmental impact. Concurrently, the study examined the combined toxicity of PS NPs and cadmium (Cd) on wheat. As indicated by the results of in situ Micro-ATR/FTIR, the aging process of PS NPs (50 nm) led to an increase in carbonyl and hydroxyl groups on their surface, enhancing hydrophilicity and consequently, the adsorption capacity for Cd. The toxicity assessment, measured by the impact on wheat leaf and root biomass after 7 d culture, revealed that pristine PS NPs with concentrations of 0-5000 mg·kg⁻¹ had a negligible effect on Cd toxicity to wheat leaves. However, aged PS NPs significantly intensified the inhibitory effect on wheat root growth, particularly at low Cd concentrations (≤ 5.0 mg·kg⁻¹). This synergistic toxicity between aged PS NPs and Cd is suspected to stem from the increased bioaccumulation of Cd in wheat, likely facilitated by the aged NPs. Thus, the study shed light on the aging behavior of soil surface NPs and its implications for environmental risk assessment.
对纳米塑料（NPs）的广泛关注促使人们对其环境影响展开了广泛研究。同时，该研究考察了聚苯乙烯纳米塑料（PS NPs）和镉（Cd）对小麦的联合毒性。原位微衰减全反射傅里叶变换红外光谱（Micro-ATR/FTIR）结果表明，50纳米的PS NPs老化过程导致其表面羰基和羟基增加，亲水性增强，进而提高了对Cd的吸附能力。通过培养7天后对小麦叶片和根生物量的影响来衡量毒性评估，结果显示，浓度为0至5000毫克·千克⁻¹的原始PS NPs对Cd对小麦叶片的毒性影响可忽略不计。然而，老化的PS NPs显著增强了对小麦根生长的抑制作用，尤其是在低Cd浓度（≤5.0毫克·千克⁻¹）时。老化的PS NPs与Cd之间的这种协同毒性被怀疑源于Cd在小麦中的生物累积增加，这可能是由老化的纳米颗粒促成的。因此，该研究揭示了土壤表面纳米颗粒的老化行为及其对环境风险评估的影响。
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