| 罗渊,乔升,赵英蓉,孟祥茁.老化前后聚乙烯微塑料的变化和对四环素植物毒性的影响[J].农业环境科学学报,2024,43(10):2260-2268. |
| 老化前后聚乙烯微塑料的变化和对四环素植物毒性的影响 |
| Changes in the physicochemical properties of polyethylene microplastics before and after aging and their effects on the phytotoxicity of tetracycline |
| 投稿时间：2024-01-31 |
| DOI：10.11654/jaes.2024-0123 |
| 中文关键词: 聚乙烯微塑料 四环素 老化 亲疏水性 植物毒性 子叶光合色素 |
| 英文关键词: polyethylene microplastics tetracycline aging hydrophilicity-hydrophobicity phytotoxicity photosynthetic pigments in cotyledons |
| 基金项目:山西省重点研发计划项目子课题(202202140601012-2);山西省高等学校科技创新项目(2021L169) |
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| 中文摘要: |
| 本研究通过观察和测定聚乙烯微塑料（PE-MPs）老化前后的形貌特征、比表面积、孔隙、粒径、接触角和傅里叶变换红外光谱，分析了其理化性质的变化，并以大白菜种子为受试生物，通过植物早期生长试验，探究了其对四环素植物毒性的影响。研究结果表明：聚乙烯微塑料经老化后颗粒破碎变小，粒径（Dx50）由91.4 μm减小至77.3 μm；比表面积从4.150 8 m2·g-1增加至4.967 1m2·g-1；接触角由103°减小至79°，表明其由疏水性变为亲水性；含氧官能团增多，并于1 650~1 800 cm-1处出现新增的羰基（C O）特征吸收带。与单独四环素相比，老化前后聚乙烯微塑料存在下，0.5 mg·L-1和5 mg·L-1四环素对大白菜种子发芽也无显著影响；胚根伸长和子叶光合色素合成受到的抑制作用均随微塑料含量的升高而加剧，其中，相对根长的最大降低幅度为18.9个百分点，光合色素相对含量的最大降低幅度为51.1个百分点。相较于老化前，微塑料老化后对四环素植物毒性的加剧效应有所减弱。 |
| 英文摘要: |
| In this study, the morphological characteristics, specific surface area, pore size, particle size, contact angle, and Fourier transform infrared spectroscopy of polyethylene microplastics（PE-MPs）before and after aging were measured to analyze the changes of their physicochemical properties. Chinese cabbage seeds were used as test organisms to explore the effects of PE-MPs on tetracycline（TC） phytotoxicity through early plant growth experiments. Results showed that the particles of PE-MPs broke and became smaller after aging; the particle size（Dx50）decreased from 91.4 μm to 77.3 μm, while the specific surface area increased from 4.150 8 m2·g-1 to 4.967 1 m2· g-1. The contact angle decreased from 103° to 79°, indicating a change from hydrophobicity to hydrophilicity. The number of oxygencontaining functional groups increased, and a new absorption band of carbonyl（C O）was found at 1 650-1 800 cm-1. Compared with TC alone, 0.5 mg·L-1 and 5 mg·L-1 TC had no significant effect on the germination of Chinese cabbage seeds in the presence of PE-MPs before and after aging; however, the inhibitory effects on the elongation of radicles and the synthesis of photosynthetic pigments in cotyledons intensified with the increase of PE-MPs content. Among them, the maximum reduction in relative radicle length was 18.9 percentage points, and the maximum reduction in the relative content of photosynthetic pigments was 51.1 percentage points. Compared with PE-MPs before aging, the exacerbation effect of PE-MPs on TC phytotoxicity weakens after aging. |
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