Bioaccessibility and Toxicity Assessment of Polycyclic Aromatic Hydrocarbons in Two Contaminated Sites

Cao, Haishan; Li, Xiaona; Qu, Changsheng; Gao, Meng; Cheng, Hao‐Tsai; Ni, Ni; Yao, Shutao; Bian, Yongrong; Gu, Chenggang; Jiang, Xin; Song, Yang

doi:10.1007/s00128-022-03530-6

Cited by 5 publications

(1 citation statement)

References 63 publications

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“…To quantify the overall toxic contamination status, we also used the toxic equivalence factor to calculate the toxic equivalence of the PAHs identified in the soil and evaluate the degree of contamination. This method uses BaP as a reference to characterize the relative toxicity level of PAHs, due to its high toxicity [ 29 ]. The results of our study show that the toxicity equivalence of the 16 PAHs ranged from 0.02 to 19.04 mg/kg, with a mean value of 9.16 mg/kg.…”

Section: Results and Analysismentioning

confidence: 99%

Characteristics and Risk Assessment of PAH Pollution in Soil of a Retired Coking Wastewater Treatment Plant in Taiyuan, Northern China

Zhang

Guo

et al. 2023

Toxics

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We analyzed the soil at the site of a former coking wastewater treatment plant on redeveloped land in Taiyuan, northern China, in an attempt to detect the presence of 16 types of priority polycyclic aromatic hydrocarbons (PAHs) listed by the United States Environmental Protection Agency (US EPA) and evaluate the potential pollution risks. The results show that the total proportion of PAHs in the surface soil of the redeveloped land ranged from 0.3 to 1092.57 mg/kg, with an average value of 218.5 mg/kg, mainly consisting of high-ring (5–6 rings) components. Characteristic ratio analysis indicated that the pollution was mainly related to the combustion of petroleum, coal, and biomasses. The wastewater treatment units operated according to the following treatment train: advection oil separation tank, dissolved air flotation tank, aerobic tank, secondary sedimentation tank, and sludge concentration tank. Our study found that pollution resulting from low-ring PAHs mainly appeared in the advection oil separation tank during the pre-wastewater treatment stage, while medium-ring PAH contamination mainly occurred in the dissolved air floatation tank, aerobic tank, and secondary sedimentation tank during the middle stages of wastewater treatment. High-ring PAH contamination primarily appeared in the sludge concentration tank in the latter stage of wastewater treatment. Based on our assessment of the ecological risk using the Nemerow Comprehensive Pollution Index and the toxicity equivalent factor (TEF) method, we determined that individual PAHs in the study area exceeded acceptable levels and the total amount of pollution was potentially harmful to the ecological environment. In addition, the comprehensive lifetime cancer risk for different populations resulting from exposure to the soil in the study area was determined to be within acceptable limits based on the average PAH concentrations.

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Section: Results and Analysismentioning

confidence: 99%