Polycyclic aromatic hydrocarbons (PAHs) are a class of organic pollutants widely present in various environmental media. Some PAHs have carcinogenic, teratogenic, and mutagenic effects. Urban lakes are severely polluted by PAHs due to human activities. Longyang Lake (LL) and Moshui Lake (ML), which serve as entry lakes for Wuhan's “Six Lakes Connectivity” project, were chosen as the study areas to learn about the migration of PAHs. Water flows from LL to ML through the Mingzhu River. Multi-Media Mass Balance Model (MMBM) and fugacity fractions (ff) were used to characterize the migration of PAHs under the hydrological connectivity project. Compared to $$, the MMBM can describe the migration of PAHs in a more detailed and quantitative way. The concentration of PAHs in water of LL decreased from 36.5 ng·L^-1 to 26.59 ng·L^-1 over 43 days, while those in ML increased from 46.8 ng·L^-1 to 198.25 ng·L^-1 over 141 days. Sediment takes a longer time to decrease to stabilization. The concentration of PAHs in the sediment of LL decreased from 932 ng·g^-1 to 0.95 ng·g^-1 over 13.33 years, while those in ML decreased from 4812 ng·g^-1 to 1.04 ng·g^-1 over 16.96 years. The stabilized concentrations were consistently lower than the observed concentrations and fell below the modeled stabilized concentrations obtained in the unconnected case (2170 ng·L^-1 in water and 40.81 ng·g^-1 in sediment). The MMBM showed that PAHs in the lake are mainly exported through runoff. However, modeling results indicated that upstream LL did not increase total PAHs concentrations in the ML because the output from ML was significantly higher. Sediment parameters sensitively influenced the results of the model. Although the simulation results showed reductions of PAHs pollution in two lakes under the hydrological connectivity project, long-term monitoring results are needed to optimize the model.

中文翻译：

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水文连通性下城市湖泊中多环芳烃 （PAHs） 的命运：一种多介质质量平衡方法


多环芳烃 （PAHs） 是一类广泛存在于各种环境介质中的有机污染物。一些 PAH 具有致癌、致畸和致突变作用。由于人类活动，城市湖泊受到 PAH 的严重污染。龙阳湖 （LL） 和磨水湖 （ML） 是武汉“六湖通”项目的入口湖，被选为研究区，以了解多环芳烃的迁移情况。水从 LL 流经明珠江流向 ML。使用多媒体质量平衡模型 （MMBM） 和逸度分数 （ff） 来表征水文连通性项目下 PAHs 的迁移。与 $$ 相比，MMBM 可以更详细、定量地描述 PAHs 的迁移。LL 水中 PAHs 浓度从 36.5 ng·L ^-1 至 26.59 ng·L ^-1 超过 43 d，而 ML 中的 L 从 46.8 ng·L ^-1 至 198.25 ng·L ^-1 超过 141 天。沉积物需要更长的时间才能减少到稳定。LL 沉积物中 PAHs 浓度在 13.33 年内从 932 ng·g ^-1 下降到 0.95 ng·g ^-1 ，而在 16.96 年内，ML 中PAHs浓度从 4812 ng·g ^-1 下降到 1.04 ng·g ^-1 。稳定浓度始终低于观察到的浓度，并低于在未关联情况下获得的模型稳定浓度 （2170 ng·L ^-1 在水中，40.81 ng·g ^-1 ）。MMBM 显示，湖中多环芳烃主要通过径流输出。然而，建模结果表明，上游 LL 并没有增加 ML 中的总 PAH 浓度，因为 ML 的输出明显更高。沉积物参数对模型的结果影响敏感。 尽管模拟结果显示水文连通项目下两个湖泊的 PAHs 污染有所减少，但需要长期监测结果来优化模型。