Establishing a partition interpolation method for PAHs in site soil based on different pollution causes.

IF 3.8 3区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Pengwei Qiao, Yue Shan, Guanghui Guo, Qianyun Zhao, Shuo Wang, Peiran He, Zhongguo Zhang
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引用次数: 0

Abstract

PAHs are recognized as carcinogens by the International Agency for Research on Cancer. Acquiring spatial distribution information of PAHs is a prerequisite and foundation for soil pollution prevention and control on site. However, the presence of extremely high concentrations (outliers) limits the predictive accuracy of the spatial distribution of PAHs. This study focuses on fluoranthene (FLT), benzo[a]pyrene (BaP), benzo[b]fluoranthene (BbF), and indeno[1,2,3-cd]pyrene (InP), which have relatively high detection rate. Using geostatistical analysis, geodetectors, solute transport models, and multiple regression methods, we analyzed the spatial distribution characteristics and main influencing factors of these PAHs, and developed a new partition interpolation method. The research results are as follows: (1) The proportion of points exceeding the screening and risk intervention thresholds for BaP (16.10% and 4.23, respectively) was higher than that of the other three PAHs. The outlier values were primarily distributed in coking areas and wastewater treatment stations, where pollution was mainly due to leaks and affected areas within a 10-m radius, exhibiting high variability. Atmospheric deposition was the main influencing factor for zones excluding outliers, where variability was weaker; (2) We used solute transport models to simulate PAH distributions for the outlier zones and multiple linear regression models for the gentle zones without outliers. This approach reduced RMSE by over 90% compared to traditional interpolation methods, and reflected both localized highly-variable structures and overall distribution characteristics. This is of great significance for improving the accuracy of spatial distribution prediction of PAHs pollution with outlier values in the site soil.

建立了基于不同污染原因的场地土壤多环芳烃分区插值方法。
多环芳烃被国际癌症研究机构认定为致癌物。获取多环芳烃的空间分布信息是进行土壤污染现场防治的前提和基础。然而,极高浓度(异常值)的存在限制了多环芳烃空间分布的预测准确性。本研究重点检测检出率较高的荧光蒽(FLT)、并并[a]芘(BaP)、并并[b]荧光蒽(BbF)和茚[1,2,3-cd]芘(InP)。利用地质统计分析、地质探测器、溶质输运模型和多元回归等方法,分析了多环芳烃的空间分布特征和主要影响因素,并提出了一种新的分区插值方法。研究结果表明:(1)BaP超过筛查和风险干预阈值的比例(分别为16.10%和4.23%)高于其他三种多环芳烃。异常值主要分布在焦化区和污水处理站,污染主要来源于泄漏和10 m半径范围内的受影响区域,变异性较大。在不包括异常值的区域,大气沉降是主要影响因子,变异性较弱;(2)采用溶质输运模型模拟异常区多环芳烃分布,采用多元线性回归模型模拟无异常区温和区多环芳烃分布。该方法与传统插值方法相比,RMSE降低了90%以上,同时反映了局部高变量结构和整体分布特征。这对于提高现场土壤中多环芳烃污染离群值空间分布预测的准确性具有重要意义。
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来源期刊
Environmental Geochemistry and Health
Environmental Geochemistry and Health 环境科学-工程:环境
CiteScore
8.00
自引率
4.80%
发文量
279
审稿时长
4.2 months
期刊介绍: Environmental Geochemistry and Health publishes original research papers and review papers across the broad field of environmental geochemistry. Environmental geochemistry and health establishes and explains links between the natural or disturbed chemical composition of the earth’s surface and the health of plants, animals and people. Beneficial elements regulate or promote enzymatic and hormonal activity whereas other elements may be toxic. Bedrock geochemistry controls the composition of soil and hence that of water and vegetation. Environmental issues, such as pollution, arising from the extraction and use of mineral resources, are discussed. The effects of contaminants introduced into the earth’s geochemical systems are examined. Geochemical surveys of soil, water and plants show how major and trace elements are distributed geographically. Associated epidemiological studies reveal the possibility of causal links between the natural or disturbed geochemical environment and disease. Experimental research illuminates the nature or consequences of natural or disturbed geochemical processes. The journal particularly welcomes novel research linking environmental geochemistry and health issues on such topics as: heavy metals (including mercury), persistent organic pollutants (POPs), and mixed chemicals emitted through human activities, such as uncontrolled recycling of electronic-waste; waste recycling; surface-atmospheric interaction processes (natural and anthropogenic emissions, vertical transport, deposition, and physical-chemical interaction) of gases and aerosols; phytoremediation/restoration of contaminated sites; food contamination and safety; environmental effects of medicines; effects and toxicity of mixed pollutants; speciation of heavy metals/metalloids; effects of mining; disturbed geochemistry from human behavior, natural or man-made hazards; particle and nanoparticle toxicology; risk and the vulnerability of populations, etc.
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