Short-term temporal variability of volatile contaminant concentrations in soil gas related to soil–atmosphere interface dynamics: Two case studies in the Veneto region (Italy)

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Integrated Environmental Assessment and Management Pub Date : 2024-08-07 DOI:10.1002/ieam.4984

Federico Fuin, Davide Casabianca

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引用次数: 0

Abstract

The study of the variability of soil gas concentrations is crucial for defining effective monitoring and remediation strategies and for the risk assessment related to the emission of vapors from the subsurface. The traditional soil gas monitoring strategy consists of seasonal surveys based on short-time-averaged sampling. Soil gas monitoring results are often used to assess the risk associated with the emission of volatile contaminants from the subsurface, using models mainly based on molecular diffusion and therefore assuming continuous emission from the soil. At two contaminated sites located in the Veneto region (Italy), continuous monitoring using a photoionization detector, pressure gauges, and an ultrasonic anemometer was used to relate soil gas variability to surface and subsurface physical parameters. At both sites a cyclic diurnal variation of volatile organic compounds concentration in soil gas was observed, correlated with the variation of several meteorological parameters and in particular with the variation of the differential pressure between soil and atmosphere and the buoyancy vertical flux. These findings question the reliability of the conventional methodology employed in the collection and assessment of soil gas data. Integr Environ Assess Manag 2024;20:2023–2032. © 2024 SETAC

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与土壤-大气界面动力学有关的土壤气体中挥发性污染物浓度的短期时间变化：威尼托地区（意大利）的两个案例研究。

研究土壤气体浓度的可变性对于确定有效的监测和补救策略以及与地下蒸汽排放有关的风险评估至关重要。传统的土壤气体监测策略包括基于短时间平均采样的季节性调查。土壤气体监测结果通常用于评估与地下挥发性污染物排放有关的风险，主要使用基于分子扩散的模型，因此假定土壤中的挥发性污染物会持续排放。在位于威尼托大区（意大利）的两个受污染场地，使用光离子化检测器、压力计和超声波风速计进行了连续监测，以将土壤气体变化与地表和地下物理参数联系起来。在这两个地点都观察到了土壤气体中挥发性有机化合物浓度的周期性昼夜变化，这种变化与几个气象参数的变化有关，特别是与土壤和大气之间的压差变化以及浮力垂直通量的变化有关。这些发现对收集和评估土壤气体数据的传统方法的可靠性提出了质疑。Integr Environ Assess Manag 2024;00:1-10。© 2024 SETAC.

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来源期刊

Integrated Environmental Assessment and Management ENVIRONMENTAL SCIENCESTOXICOLOGY&nbs-TOXICOLOGY

CiteScore

5.90

自引率

6.50%

发文量

156

期刊介绍： Integrated Environmental Assessment and Management (IEAM) publishes the science underpinning environmental decision making and problem solving. Papers submitted to IEAM must link science and technical innovations to vexing regional or global environmental issues in one or more of the following core areas: Science-informed regulation, policy, and decision making Health and ecological risk and impact assessment Restoration and management of damaged ecosystems Sustaining ecosystems Managing large-scale environmental change Papers published in these broad fields of study are connected by an array of interdisciplinary engineering, management, and scientific themes, which collectively reflect the interconnectedness of the scientific, social, and environmental challenges facing our modern global society: Methods for environmental quality assessment; forecasting across a number of ecosystem uses and challenges (systems-based, cost-benefit, ecosystem services, etc.); measuring or predicting ecosystem change and adaptation Approaches that connect policy and management tools; harmonize national and international environmental regulation; merge human well-being with ecological management; develop and sustain the function of ecosystems; conceptualize, model and apply concepts of spatial and regional sustainability Assessment and management frameworks that incorporate conservation, life cycle, restoration, and sustainability; considerations for climate-induced adaptation, change and consequences, and vulnerability Environmental management applications using risk-based approaches; considerations for protecting and fostering biodiversity, as well as enhancement or protection of ecosystem services and resiliency.