Sorption kinetics of parent and substituted PAHs for low-density polyethylene (LDPE): Determining their partition coefficients between LDPE and water (K-LDPE) for passive sampling
Sorption kinetics of parent and substituted PAHs for low-density polyethylene (LDPE): Determining their partition coefficients between LDPE and water (K-LDPE) for passive sampling
复制标题
低密度聚乙烯 (LDPE) 母体和取代多环芳烃的吸附动力学：确定被动采样的 LDPE 和水 (K-LDPE) 之间的分配系数
DOI：
10.1016/j.jes.2019.07.021
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发表时间：
2020
影响因子：
6.9
通讯作者：
Zhang Hong
中科院分区：
文献类型：
--
作者：
Lei Pei;Zhu Jinjie;Pan Ke;Zhang Hong
低密度聚乙烯（LDPE）已被广泛用作被动采样的疏水性有机污染物（HOCs）在水生环境中的吸附剂。然而，它只看到有限的应用被动采样测量自由溶解的浓度的母体和取代的多环芳烃（SPAHs），这是已知的有毒，诱变和致癌。本文选择了16种优先选择的多环芳烃和一些典型的多环芳烃作为目标化合物，采用气相色谱-质谱联用仪（GC-MS）同时测定。在实验室中进行了一些批实验，以探索目标化合物在LDPE膜中的吸附动力学。结果表明，在吸附动力学实验中，多环芳烃和多环芳烃均能在19-38 d内达到吸附平衡。16种优先选择的PAHs在LDPE膜（50 μm厚）和水（KLDPE）之间的分配系数与文献报道的值吻合较好，其中9种SPAHs的KLDPE值为首次报道。观察到显著的线性关系，即，多环芳烃的logKLDPE= 0.705 × logKOW+ 1.534（R2= 0.8361，p < 0.001），多环芳烃的logKLDPE= 0.458 × logKOW+ 3.092（R2= 0.5609，p = 0.0077）。所选择的LDPE膜也被证明满足所选择的目标化合物的“零下沉”条件。研究结果可为被动采样器的配置和现场应用提供基础支持。
Low-density polyethylene (LDPE) has been widely used as a sorbent for passive sampling of hydrophobic organic contaminants (HOCs) in aquatic environments. However, it has seen only limited application in passive sampling for measurement of freely dissolved concentrations of parent and substituted PAHs (SPAHs), which are known to be toxic, mutagenic and carcinogenic. Here, the 16 priority PAHs and some typical PAHs were selected as target compounds and were simultaneously determined by gas chromatography–mass spectrometer (GC–MS). Some batch experiments were conducted in the laboratory to explore the adsorption kinetics of the target compounds in LDPE membranes. The results showed that both PAHs and SPAHs could reach equilibrium status within 19–38 days in sorption kinetic experiments. The coefficients of partitioning between LDPE film (50 μm thickness) and water (KLDPE) for the 16 priority PAHs were in good agreement with previously reported values, and the values ofKLDPEfor the 9 SPAHs are reported in this study for the first time. Significant linear relationships were observed, i.e., logKLDPE= 0.705 × logKOW+ 1.534 for PAHs (R2= 0.8361,p< 0.001) and logKLDPE= 0.458 × logKOW+ 3.092 for SPAHs (R2= 0.5609,p= 0.0077). The selected LDPE film was also proven to meet the condition of “zero sink” for the selected target compounds. These results could provide basic support for the configuration andin situapplication of passive samplers.