进口再生塑料颗粒中特征污染物的筛选及污染特征研究

Study on screening of characteristic pollutants and pollution characteristics in imported regenerated plastic particles

  • 摘要: 为了掌握进口再生塑料颗粒中污染物的污染特性,选取5种不同类型的进口再生塑料颗粒,基于来源及再生利用过程分析其可能含有的污染物类型,筛选出重金属、双酚类化合物〔包括四溴双酚A(BPA)与四溴双酚S(BPS)〕和挥发性有机物(VOCs)3种特征污染物进行污染特征分析。结果发现,5种再生塑料颗粒中检测出6种重金属,包括Cr、Mn、Pb、Cd、Cu、Hg,其中Cr、Mn、Pb的浓度相对较高;5种再生塑料颗粒中BPS的检出率达100%,BPA的检出率为20%~100%,且BPS浓度大于BPA,这可能与实际生产中使用BPS等代替BPA有关;5种再生塑料颗粒中检测出的VOCs中,除二氯甲烷外均为苯的同系物。研究结果可为塑料颗粒后续的再生利用提供基础数据支持,并有助于相关部门进一步规范进口再生塑料颗粒的管控。

     

    Abstract: In order to understand the pollution characteristics of pollutants in imported recycled plastic particles, five different types of imported recycled plastic particles were selected. Based on the source and recycling process, the possible types of pollutants were identified. Three characteristic pollutants, namely heavy metals, bisphenol compounds (including tetrabromobisphenol A (BPA) and tetrabromobisphenol S (BPS)), and volatile organic compounds (VOCs), were screened out and their pollution characteristics were analyzed. The results showed that six heavy metals, Cr, Mn, Pb, Cd, Cu, and Hg, were detected in the five types of recycled plastic particles, with relatively high concentrations of Cr, Mn, and Pb. The detection rate of BPS reached 100%, and the detection rate of BPA was between 20% and 100%. The mass concentration of BPS in the five recycled plastic particles was greater than that of BPA, which may be related to the use of BPS or other substitutes for BPA in actual production. Most of the detected VOCs, except for dichloromethane, were homologues of benzene. The results could provide basic data support for subsequent recycling work and help relevant departments further regulate the control of imported recycled plastic particles.

     

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