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Effects of chemical and natural ageing on the release of potentially toxic metal additives in commercial PVC microplastics
Chemosphere ( IF 8.8 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.chemosphere.2021.131274
Jun Meng 1 , Baile Xu 2 , Fei Liu 3 , Wenjin Li 4 , Nathan Sy 5 , Xiaoxia Zhou 3 , Bing Yan 3
Affiliation  

Various chemical substances, such as potentially toxic trace metals, are used as plastic additives to improve the performance of polymers and extend the service life of plastic products. However, these added trace metals are likely released from plastic into the environment when the plastic becomes a pollutant, although the process is poorly understood. In this study, chemical ageing of commercial polyvinyl chloride (PVC) microplastics using hydrogen peroxide (H2O2) and natural ageing of PVC that had been added to an alkaline paddy soil were undertaken to evaluate the potential release of trace metals from PVC. Enhanced release of trace metals from PVC with the increasing H2O2 concentrations was observed, in which the released Pb was 1–2 orders of magnitude higher than other metals (p < 0.01). The released Cr, Ni, Pb, Cu, Zn, Cd and Mn accounted for 87.37%, 79.27%, 22.02%, 20.93%, 17.06%, 15.11%, and 11.02% of their total concentrations (0.28 ± 0.03, 0.08 ± 0.01, 13.67 ± 0.18, 1.07 ± 0.02, 2.20 ± 0.18, 0.05 ± 0.00 and 1.26 ± 0.08 mmol kg−1) in PVC after ageing with 30% H2O2, respectively. Compared with the control treatment without PVC addition, the concentrations of CaCl2-extractable Cu, Mn, Ni, Pb, and Zn in the soil treated with 5% PVC are significantly increased after incubation for 60 days (p < 0.01). In conclusion, chemical and natural ageing have the potential to lead to the release of Cu, Mn, Ni, Pb, and Zn from the commercial PVC into aquatic and terrestrial environments.



中文翻译:

化学和自然老化对商用 PVC 微塑料中潜在有毒金属添加剂释放的影响

各种化学物质,如具有潜在毒性的微量金属,被用作塑料添加剂,以改善聚合物的性能并延长塑料产品的使用寿命。然而,当塑料成为污染物时,这些添加的微量金属很可能从塑料中释放到环境中,尽管这个过程知之甚少。在这项研究中,使用过氧化氢 (H 2 O 2 )对商用聚氯乙烯 (PVC) 微塑料进行化学老化,并对添加到碱性稻田中的 PVC 进行自然老化,以评估 PVC 中微量金属的潜在释放。随着 H 2 O 2的增加,PVC 中微量金属的释放增加观察到的浓度,其中释放的 Pb 比其他金属高 1-2 个数量级(p  < 0.01)。释放的 Cr、Ni、Pb、Cu、Zn、Cd 和 Mn 分别占总浓度的 87.37%、79.27%、22.02%、20.93%、17.06%、15.11% 和 11.02%(0.28±0.083±0.01%)。 , 13.67 ± 0.18, 1.07 ± 0.02, 2.20 ± 0.18, 0.05 ± 0.00 和 1.26 ± 0.08 mmol kg -1 ) 在用 30% H 2 O 2老化后的 PVC 中分别为。与未添加PVC的对照处理相比,5% PVC处理的土壤中CaCl 2 可萃取的Cu、Mn、Ni、Pb和Zn的浓度在培养60天后显着增加(p < 0.01)。总之,化学和自然老化有可能导致商业 PVC 中的 Cu、Mn、Ni、Pb 和 Zn 释放到水生和陆地环境中。

更新日期:2021-06-22
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