与海洋相比,城市河流沉积物中的微塑料(MPs)研究很少,土壤,甚至河流。在这项研究中,国会议员的季节性丰富,以及它们对镇江市古运河河流沉积物中重金属吸附的影响因素,中国,这是第一次被调查。通过现场取样,显微观察,拉曼光谱,扫描电子显微镜,和高温消化,丰富,形状,颜色,颗粒大小,type,以及不同季节古运河沉积物中MPs的表面特征,以及MP作为重金属载体在不同季节的影响因素,进行了分析。结果表明,夏季和冬季干沉积物中MPs的平均丰度分别为2049.09±883.78和2216.36±826.21项kg-1,分别,和不同的网站显著变化。此外,颗粒大小,类型,颜色,MP的形状表现出季节性变化。主要观察到四种MP形状:纤维,碎片,粒子,和电影。其中,夏季沉积物中的MP主要是纤维,冬季沉积物中的MP主要是颗粒。在夏季和冬季的沉积物中,透明MP和小尺寸(<0.5毫米)MP是主要的,议员的数量随着议员人数的增加而减少。主要的MPs种类是聚氯乙烯(PVC),聚苯乙烯(PS),聚丙烯(PP),聚对苯二甲酸乙二醇酯(PET),聚碳酸酯(PC),和聚乙烯(PE),PP是不同季节沉积物中主要的MP。扫描电子显微镜-能量色散光谱仪(SEM-EDS)表明,MPs的表面具有粗糙的特征,多孔,破裂,和撕裂,随着各种重金属元素的附着,所有重金属元素在MP上都有不同程度的积累。冬季MPs中Mn含量与沉积物中Mn含量呈显著正相关(p<0.05)。表明冬季MP中的锰可能来自沉积物。此外,类型,形状,尺寸,MPs的颜色影响其对重金属的吸附能力。大部分MPs对Pb的吸附呈显著负相关,和MPs对Cr的吸附,Zn,Cu,Cd,与Mn呈显著正相关。MPs可以作为重金属的载体,这将进一步增强生物的危害,并对城市河流环境的安全构成潜在威胁。
There are few studies on microplastics (MPs) in urban
river sediments compared to oceans, soils, and even rivers. In this study, the seasonal abundance of MPs, as well as their influencing factors on heavy metal adsorption in
river sediments of the Ancient Canal of Zhenjiang City, China, were investigated for the first time. Through on-site sampling, microscopic observation, Raman spectroscopy, scanning electron microscopy, and high-temperature digestion, the abundance, shape, color, particle size, type, and surface characteristics of MPs in Ancient Canal sediments in different seasons, as well as the influencing factors of MPs as heavy metal carriers in different seasons, were analyzed. The results showed that the average abundance of MPs is 2049.09 ± 883.78 and 2216.36 ± 826.21 items kg-1 dry sediments in summer and winter, respectively, and different sites change significantly. In addition, particle sizes, types, colors, and shapes of MPs exhibited seasonal variations. Four MPs shapes were mainly observed: fibers, fragments, particles, and films. Among them, MPs in summer sediments are mainly fiber, and MPs in winter sediments are mainly particles. In the sediment in summer and winter, transparent MPs and small-size (<0.5 mm) MPs are the main ones, where the abundance of MPs decreased with increasing MPs size. The main MPs species are polyvinyl chloride (PVC), polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET), polycarbonate (PC), and polyethylene (PE), with PP being the predominant MPs in the sediments in different seasons. Scanning electron microscopy-energy dispersive spectrometer (SEM-EDS) revealed that the surfaces of the MPs were characterized by rough, porous, cracked, and torn, with the attachment of various heavy metal elements, and all of the heavy metal elements accumulated to different degrees on the MPs. There was a significant positive correlation (p < 0.05) between the Mn content in the MPs and the Mn content in the sediments in winter, suggesting that the Mn in the MPs in winter may be derived from the sediments. In addition, the type, shape, size, and color of MPs affect the adsorption capacity of heavy metals. Most of the adsorption of MPs on Pb showed a significant negative correlation, and the adsorption of MPs on Cr, Zn, Cu, Cd, and Mn showed a significant positive correlation. MPs can be used as carriers of heavy metals, which will further enhance the hazards of living organisms and pose a potential threat to the safety of the urban
river environment.