Spatio-vertical characterization of the BTEXS group of VOCs in Chinese agricultural soils

Xu, Chenye; Lin, Xinmeng; Yin, Shanshan; Li, Kai; Liu, Weiping

doi:10.1016/j.scitotenv.2019.133631

Cited by 19 publications

(4 citation statements)

References 25 publications

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“…A recent study found the same electrostatic interaction of aniline [63]. The nitro group in TNT acted as a strong electron-absorbing group, resulting in an insufficient negative charge on the π orbitals 11 and making TNT a strong electron receptor. As a result, it could complex with the functional group of loess colloid particles by charge transfer [5,15], which is consistent with previous research results [61].…”

Section: The Proposed Adsorption Mechanismmentioning

confidence: 78%

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Co-Transport of Aniline and TNT with Loess Colloid Particles in Saturated Loess Columns: Mechanism and Processes

Meng,

Hu,

Sun

et al. 2024

Water

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The transport of mobile colloidal particles with organic pollutants in porous media has attracted considerable attention. Aniline and 2,4,6-trinitrotoluene (TNT), as aromatic compounds and key components of energetic materials, are continuously released into the environment. This study compared the co-transport of loess colloidal particles with aniline and TNT, aiming to investigate the influence of structural and physicochemical properties of the pollutants. The colloids were prepared and characterized, and static adsorption and dynamic column experiments were conducted. The results indicate that the adsorption processes of aniline and TNT both conformed to the quasi-second-order kinetic and the intra-particle diffusion models, with aniline exhibiting higher rate constants than TNT. The main adsorption mechanism involved van der Waals force, hydrogen bonding, and electrostatic interaction. Response surface experiments indicated that the adsorption capacity increased with higher initial concentration of organic compound but decreased with larger particle size and higher Na+ concentration. In column experiments, the adsorption of loess colloid particles on aniline and TNT was strongly correlated with the concentration of loess colloid particles. Loess colloid particles could be used as carriers to enhance the co-transport, with aniline exhibiting a faster transport rate due to the differences in polarity and molecular structure compared to TNT. In summary, loess colloidal particles enhanced the transport behavior of aniline and TNT in saturated loess columns. The differences in polarity and molecular structure of aniline and TNT further affect their co-transport mechanism in loess.

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Section: The Proposed Adsorption Mechanismmentioning

confidence: 78%

“…Moreover, they are prone to accumulating in soil and groundwater environment [7], thereby posing threats to both the ecological environment and human health [8,9]. As a result, these issues have garnered significant attention from countries around the world [10,11].…”

Section: Introductionmentioning

confidence: 99%

Co-Transport of Aniline and TNT with Loess Colloid Particles in Saturated Loess Columns: Mechanism and Processes

Meng,

Hu,

Sun

et al. 2024

Water

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“…Similarly, the PNEC w of chloroform derived by the concentration in the overlying water was calculated as 2.3 μg/L (Equation 2), and then the PNEC s in the soil environment was found to be 109.2 μg/kg (Figure 3). The reported average residual amount of chloroform in an agricultural soil was 2.99 μg/kg (Xu et al, 2019), and the RQ value was 0.027, which was graded as low risk. The detected concentration of chloroform in a pesticide‐contaminated site investigated in our study was 33.2 mg/kg, and the RQ was 304.2 (high ecological risk).…”

Section: Resultsmentioning

confidence: 99%

Ecological Risk Assessment of Three Pesticide Additives in Soil and Application to the Remediation of Contaminated Soil

Li,

Zhang,

Wang

et al. 2024

Enviro Toxic and Chemistry

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Pesticide additives (PAs) are auxiliary ingredients added to the pesticide manufacturing and use processes, constituting 1% to 99% of the pesticide and often composed of benzene and chlorinated hydrocarbons. We selected three typical PAs, toluene, chloroform, and trichloroethylene, to evaluate their retention function toxicity and ecological risk in soil. Soil immobilization techniques and aquatic model organisms were used to demonstrate the effectiveness of the immobilized soil method to determine the ecological risk of chemicals. The 48‐h median lethal concentrations of toluene, chloroform, and trichloroethylene alone in spiked soil on Daphnia magna were 10.5, 2.3, and 1.1 mg/L (medium, high, and high toxicity, respectively). The toxicity of the three‐PA mixtures showed an antagonistic effect. The risk levels of toluene, chloroform, and trichloroethylene in the soil were evaluated as moderate to high, low to high, and high risk, respectively. The toxicity of two pesticide‐contaminated sites in the Yangtze River Delta before and after remediation was successfully evaluated by immobilized soil technology. The toxicity of two soil sampling points was reduced from medium toxic to low toxic and no toxic, respectively, after remediation. The results of our study give a rationale for and prove the validity of the aquatic model organisms and soil immobilization techniques in assessing the soil retention functions toxicity of PAs. Environ Toxicol Chem 2024;00:1–13. © 2024 SETAC

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“…Due to the complexity of mechanical properties under different stratum conditions, the impact of subsidence on the movement of pollutants in different strata is different [29]. HS-GCMS analysis indicated that benzene content decreased significantly with the increase in soil depth [30]. Microplastics migrate from the surface layer of rice paddies and dryland to deeper soil layers, showing differences in different strata [31].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pumping Speeds on the Fate of Aniline in Different Soil Layer

Gao,

Wang,

et al. 2024

Sustainability

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Helan Mountain is an important ecological safety barrier in northwest China. In this study, a heterogeneous site polluted by aniline on Helan Mountain was the research object, and the TMVOC (A Simulator For Multiple Volatile Organic Chemicals) model of aniline restoration by pumping was optimized by employing a column experiment. Four typical layers of the soil medium were selected to explore the influence of soil settlement caused by different pumping speeds on the fate of aniline in different zones. The results show that the optimal pumping speed at the site is 3.24 × 106 m3/month and the latest remediation time is the 10th month after the start of the remediation. The larger the pumping speed is, the more obvious the sedimentation effect is. When the remediation is carried out at 5.18 × 106 m3/month, the NAPL (Non-Aqueous-Phase Liquid) phase removal rate decreases by 33.75% and the distribution of aniline to the NAPL phase increases, compared to that without considering the soil settlement. The fate of aniline in the source zone is the least affected by sedimentation, while that in the vadose zone is the most affected. The phase redistribution phenomenon is the most obvious in the water table fluctuation zone, and the NAPL phase aniline changes into gas and liquid phases. In addition, the NAPL phase concentration in the water table fluctuation zone is two orders of magnitude higher than that at 0.2 m below the water table. NAPL is the most sensitive to the relative settlement in the aquifer. The simulation results can provide a technical reference for the future application of P&T (Pump-and-Treat) technology in the remediation of organically contaminated sites to facilitate the sustainable use of soil. It is suggested that more attention should be paid to the water table fluctuation zone during the remediation of contaminated sites.

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Spatio-vertical characterization of the BTEXS group of VOCs in Chinese agricultural soils

Cited by 19 publications

References 25 publications

Co-Transport of Aniline and TNT with Loess Colloid Particles in Saturated Loess Columns: Mechanism and Processes

Co-Transport of Aniline and TNT with Loess Colloid Particles in Saturated Loess Columns: Mechanism and Processes

Ecological Risk Assessment of Three Pesticide Additives in Soil and Application to the Remediation of Contaminated Soil

Effect of Pumping Speeds on the Fate of Aniline in Different Soil Layer

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