Department of Chemical Engineering, University of Alicante, P.O. Box 99, E-03080 Alicante, Spain(1); Institute of Chemical Process Engineering, University of Alicante, P.O. Box 99, E-03080 Alicante, Spain(2).
Department of Chemical Engineering, University of Alicante, P.O. Box 99, E-03080 Alicante, Spain(1); Institute of Chemical Process Engineering, University of Alicante, P.O. Box 99, E-03080 Alicante, Spain(2).
Waste Manag. 2022 May 1;144:113-121. doi: 10.1016/j.wasman.2022.03.016. Epub 2022 Mar 25.
In the present work, recycled polyethylene (LDPE) samples of agricultural, post-commercial, post-industrial and post-consumer origin were selected and analysed. The analysis comprised the determination of different contaminants such as metals, polycyclic aromatic hydrocarbons (PAHs), dioxin-like biphenyl polychlorides (PCBs), and polychlorinated-dibenzo-p-dioxins and furans (PCDD/Fs). A comparison with one sample of virgin plastic (unrecycled) was performed. The study aimed at stressing the importance of this type of analysis in recycled plastics. Indeed, such an examination will determine the material's final destination, and the possible origin of the pollutants analysed is investigated. Black post-industrial and post-consumer samples presented the highest concentration of PCBs and PCDD/Fs, attaining a maximum value of 2.40 pg WHO-TEQ/g, while the least toxic sample (post-commercial) presented a toxicity of 0.38 pg WHO-TEQ/g. PAHs content was also much higher in black samples, reaching 514.41 ng/g, while the lowest concentrations were obtained for the post-commercial plastic sample, which did not exceed 38.98 ng/g. The higher PAHs concentrations in the black samples were related to the carbon black content of the black samples, which was 2.00% for black post-industrial sample and 1.51% for post-consumer sample. The PCDD/Fs congener profile observed in almost all samples was very similar to the profile found in the literature on urban air samples, indicating that the plastic is mainly influenced by the environment. The presence of some metals (mainly copper) showed a slight correlation with PCDD/Fs content. The pollutants analysed were found to be significantly reduced during the cleaning processes that are generally carried out in recycling companies.
在本工作中，选择并分析了农业、商业后、工业后和消费后来源的再生聚乙烯（LDPE）样品。分析包括测定不同污染物，如金属、多环芳烃（PAHs）、二恶英类联苯多氯联苯（PCBs）和多氯代二苯并对二恶英和呋喃（PCDD/Fs）。与一个原始塑料（未回收）样品进行了比较。本研究旨在强调这种分析在再生塑料中的重要性。事实上，这种检查将决定材料的最终用途，并调查分析污染物的可能来源。黑色工业后和消费后样品表现出最高浓度的 PCBs 和 PCDD/Fs，达到 2.40 pg WHO-TEQ/g 的最大值，而毒性最低的（商业后）样品的毒性为 0.38 pg WHO-TEQ/g。黑色样品中的 PAHs 含量也高得多，达到 514.41 ng/g，而商业后塑料样品的浓度最低，不超过 38.98 ng/g。黑色样品中较高的 PAHs 浓度与黑色样品中炭黑的含量有关，黑色工业后样品为 2.00%，消费后样品为 1.51%。几乎所有样品中观察到的 PCDD/Fs 同系物谱与文献中城市空气样品的谱非常相似，表明塑料主要受环境影响。一些金属（主要是铜）的存在与 PCDD/Fs 含量有轻微的相关性。分析发现，在回收公司通常进行的清洁过程中，污染物显著减少。
