Comparison of Detection Methods of Microplastics in Landfill Mineralized Refuse and Selection of Degradation Degree Indexes,Environmental Science & Technology

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Comparison of Detection Methods of Microplastics in Landfill Mineralized Refuse and Selection of Degradation Degree Indexes
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-09-29 , DOI: 10.1021/acs.est.1c02772
Ying Zhang ₁ , Yawen Peng ₁ , Chu Peng ₁ , Ping Wang ₁ , Yuan Lu ₁ , Xiaosong He _{2,

3} , Lei Wang ₁

Affiliation

A landfill is an important sink of plastic waste and potential sources of microplastics (MPs) when mineralized refuse is reused. However, limitations are still present in quantifying MPs in mineralized refuse and assessing their degradation degree. In this study, laser direct infrared spectroscopy and liquid chromatography-tandem mass spectrometry (LC-MS/MS) were used to identify MPs of mineralized refuse from a landfill. Although 25–113 items/g MPs were detected in particles subjected to flotation, 37.9–674 μg/g polyethylene terephthalate (PET) and 0.0716–1.01 μg/g polycarbonate (PC) were detected in the residual solids by LC-MS/MS, indicating a great amount of plastic polymers still presented in the residue. This suggests that the commonly used flotation-counting method will lead to significant underestimation of MP pollution in mineralized refuse, which might be due to the aging and aggregation process caused by the long-term landfill process. The ratio of “bisphenol A/PC” and “plasticizer/MPs” was found to be positively correlated and negatively correlated with the landfill age, respectively. Therefore, in addition to the spectral index such as the carbonyl index, new indexes based on the concentrations of polymers, free monomers, and plasticizers were proposed to characterize the degradation degree of MPs in a landfill.

中文翻译：

垃圾填埋矿化垃圾微塑料检测方法比较及降解度指标选择

垃圾填埋场是塑料垃圾的重要汇点，也是矿化垃圾再利用时微塑料 (MPs) 的潜在来源。然而，在量化矿化垃圾中的 MPs 和评估其降解程度方面仍然存在局限性。在这项研究中，激光直接红外光谱和液相色谱-串联质谱 (LC-MS/MS) 用于识别垃圾填埋场矿化垃圾的 MP。虽然在经过浮选的颗粒中检测到 25-113 项/克 MP，但通过 LC-MS/MS 在残留固体中检测到 37.9-674 μg/g 聚对苯二甲酸乙二醇酯 (PET) 和 0.0716-1.01 μg/g 聚碳酸酯 (PC) ，表明残留物中仍存在大量塑料聚合物。这表明常用的浮选法会导致矿化垃圾中 MP 污染的严重低估，这可能是由于长期填埋过程造成的老化和聚集过程。发现“双酚A/PC”和“增塑剂/MPs”的比例分别与填埋年龄呈正相关和负相关。因此，除了羰基指数等光谱指数外，还提出了基于聚合物、游离单体和增塑剂浓度的新指数来表征垃圾填埋场中 MPs 的降解程度。发现“双酚A/PC”和“增塑剂/MPs”的比例分别与填埋年龄呈正相关和负相关。因此，除了羰基指数等光谱指数外，还提出了基于聚合物、游离单体和增塑剂浓度的新指数来表征垃圾填埋场中 MPs 的降解程度。发现“双酚A/PC”和“增塑剂/MPs”的比例分别与填埋年龄呈正相关和负相关。因此，除了羰基指数等光谱指数外，还提出了基于聚合物、游离单体和增塑剂浓度的新指数来表征垃圾填埋场中 MPs 的降解程度。

更新日期：2021-10-19

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