Journal
ENVIRONMENTAL POLLUTION
Volume 308, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2022.119620
Keywords
Per; and polyfluoroalkyl substances; Soil; Sources; Distribution pattern; Correlation analysis
Categories
Funding
- Program of Shanghai Academic/Technology Research Leader under the Science and Tech-nology Innovation Action Plan [19XD1434900]
- National Natural Science Foundation of China [32061133001]
- Youth Innovative Funding of the Shanghai Academy of Environmental Sciences [CX2021140324]
Ask authors/readers for more resources
This study investigated the concentrations and compositions of PFAS in soils near different potential sources in Shanghai. The results showed that the concentrations of PFAS varied among different locations, with the highest concentrations near the fire station. PFAS in soils were mainly composed of short-chain perfluoroalkyl carboxylic acids. Principal component analysis indicated different correlations between long-chain and short-chain PFAS. Strong positive correlations were found within three groups of perfluoroalkyl carboxylic acids. PFAS near the fire station were likely directly emitted from a point source, while PFAS near other sites had multiple input pathways.
Per- and polyfluoroalkyl substances (PFAS) are complex emerging pollutants that are widely distributed in soils. The compositions of PFAS vary according to the emission sources. However, the soil distributions of PFAS from different sources are still poorly understood. In this study, the concentrations and compositions of 18 PFAS in soils close to potential sources (industrial areas, airports, landfills, fire stations and agricultural areas) were investigated in Shanghai. The total PFAS concentrations varied from 0.64 to 294 mu g kgc.;.w.. Among the sites, the highest PFAS concentration was found near the fire station (average = 57.9 mu g kgc,1.w.), followed by the industrial area (average = 8.53 mu g kg 1d.w.). The detection frequencies of the 18 PFAS ranged from 47.5% to 100%. Perfluorooctanoic acid (PFOA) and perfluoroheptanoic acid (PFHpA) were detected in all samples. The detection frequencies of PFAS near the fire station were higher than those near other sources. The PFAS in soils were mainly composed of short-chain perfluoroalkyl carboxylic acids (C <= 8). Elevated concentrations of long-chain perfluoroalkyl carboxylic acids (C > 12) were found in industrial area. Principal component analysis revealed that long-chain PFAS had different factor loadings compared to short-chain PFAS. With the exception of agricultural soils, the correlations between individual PFAS were more positive than negative. Strong positive correlations were found within three groups of perfluoroalkyl carboxylic acids (C5-C7, C9-C12, and C14-C18), suggesting their similar inputs and transportation pathways. The PFAS in soils around the fire station were likely directly emitted from a point source. In contrast, the PFAS in soils near the other sites had multiple input pathways, including both direct emission and precursor degradation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available