Waste Science and Technology, Luleå University of Technology, Laboratorievägen 14, SE-971 87, LULEÅ Sweden, Luleå, Sweden.
Geotechnics and Environment, Norwegian Geotechnical Institute (NGI), 0806, Oslo, Norway; Department of Chemistry, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway.
Environ Pollut. 2024 Oct 15;359:124481. doi: 10.1016/j.envpol.2024.124481. Epub 2024 Jul 4.
There are large masses of coal tar asphalt present in old roads, containing high concentrations of polycyclic aromatic hydrocarbons (PAHs). Uncertainty surrounding the risk they pose causes problems during road reconstruction and for the reuse of the asphalt present. To help elucidate potential risks, a parsimonious linear equilibrium partitioning model for the bioavailability of PAHs in soils contaminated by tar asphalt particles was developed. Furthermore, a set of partitioning coefficients for PAHs between sampled coal tar binders and water were determined experimentally, as well as measurements of freely dissolved concentrations using polyoxymethylene samplers in batch tests and column recirculation experiments with various mixtures of different soils (peat and sandy loam) and tar asphalts. The model predictions of freely dissolved concentrations were conservative and within an order of magnitude of measurements in both batch and column tests. The model presented here only relies on soil organic carbon content and the fraction coal tar binder in the soil to model PAH partitioning. This model could be used for more realistic. Low tier risk assessments towards rational prioritization of sensitive areas for risk reduction efforts.
旧道路中存在大量的煤焦油沥青，其中含有高浓度的多环芳烃 (PAHs)。在道路重建和重新利用现有沥青时，它们所构成的风险的不确定性带来了问题。为了帮助阐明潜在风险，开发了一种用于受焦油沥青颗粒污染土壤中 PAHs 生物有效性的简约线性平衡分配模型。此外，还通过实验确定了采样煤焦油粘合剂与水之间 PAHs 的分配系数，以及使用聚甲醛采样器在批量测试和不同土壤（泥炭和砂壤土）和焦油沥青的混合柱再循环实验中测量自由溶解浓度。模型预测的自由溶解浓度是保守的，并且与批量和柱测试中的测量值在数量级上一致。本文提出的模型仅依赖于土壤有机碳含量和土壤中煤焦油粘合剂的分数来模拟 PAH 分配。该模型可用于更现实的低层次风险评估，以合理确定需要优先进行风险降低工作的敏感区域。
