State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China.
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
J Environ Sci (China). 2020 Jan;87:349-360. doi: 10.1016/j.jes.2019.07.021. Epub 2019 Aug 6.
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 (K) for the 16 priority PAHs were in good agreement with previously reported values, and the values of K for the 9 SPAHs are reported in this study for the first time. Significant linear relationships were observed, i.e., log K = 0.705 × log K + 1.534 for PAHs (R = 0.8361, p < 0.001) and log K = 0.458 × log K + 3.092 for SPAHs (R = 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 and in situ application of passive samplers.
低密度聚乙烯 (LDPE) 已被广泛用作吸附剂，用于被动采样水生环境中的疏水性有机污染物 (HOCs)。然而，它在用于测量母体和取代多环芳烃 (SPAHs) 的自由溶解浓度的被动采样中应用有限，这些 SPAHs 已知具有毒性、致突变性和致癌性。在这里，选择了 16 种优先多环芳烃和一些典型的多环芳烃作为目标化合物，并通过气相色谱-质谱联用仪 (GC-MS) 同时进行测定。在实验室进行了一些批次实验，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，PAHs 和 SPAHs 均可在 19-38 天内达到平衡状态。16 种优先 PAHs 在 50μm 厚的 LDPE 膜与水之间的分配系数 (K) 与先前报道的值非常吻合，本研究首次报道了 9 种 SPAHs 的 K 值。观察到显著的线性关系，即对于 PAHs，log K = 0.705 × log K + 1.534 (R = 0.8361, p < 0.001)，对于 SPAHs，log K = 0.458 × log K + 3.092 (R = 0.5609, p = 0.0077)。所选的 LDPE 膜也被证明符合所选目标化合物的“零汇”条件。这些结果可为被动采样器的配置和原位应用提供基本支持。
