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Spatial Variability of PAHs and Microbial Community Structure in Surrounding Surficial Soil of Coal-Fired Power Plants in Xuzhou, China

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ABSTRACT

This work investigated the spatial profile and source analysis of polycyclic aromatic hydrocarbons (PAHs) in soil that surrounds coal-fired power plants in Xuzhou, China. High-throughput sequencing was employed to investigate the composition and structure of soil bacterial communities. The total concentration of 15 PAHs in the surface soils ranged from 164.87 to 3494.81 μg/kg dry weight. The spatial profile of PAHs was site-specific with a concentration of 1400.09–3494.81 μg/kg in Yaozhuang. Based on the qualitative and principal component analysis results, coal burning and vehicle emission were found to be the main sources of PAHs in the surface soils. The phylogenetic analysis revealed differences in bacterial community compositions among different sampling sites. Proteobacteria was the most abundant phylum, while Acidobacteria was the second most abundant. The orders of Campylobacterales, Desulfobacterales and Hydrogenophilales had the most significant differences in relative abundance among the sampling sites. The redundancy analysis revealed that the differences in bacterial communities could be explained by the organic matter content. They could also be explicated by the acenaphthene concentration with longer arrows. Furthermore, OTUs of Proteobacteria phylum plotted around particular samples were confirmed to have a different composition of Proteobacteria phylum among the sample sites. Evaluating the relationship between soil PAHs concentration and bacterial community composition may provide useful information for the remediation of PAH contaminated sites.

No MeSH data available.


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PAHs concentrations and TOM content in each soil sample (see supplementary material).
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ijerph-13-00878-f002: PAHs concentrations and TOM content in each soil sample (see supplementary material).

Mentions: As shown in Figure 2, the total concentration of 15 PAHs in soils ranged from 164.87 to 3494.81 μg/kg dry weight with an average concentration of 1089.69 μg/kg. According to the grading criteria, the PAHs pollution levels in the study area rangedfrom no pollution to severe pollution. At sites px6 and yz3, two highest PAHs concentration were observed (3412.64 and 3494.81 μg/kg). Compared with the PAH concentrations reported in farmland or suburb soil of Korea (236 μg/kg), Switzerland (225 μg/kg), Malaysia (155 μg/kg), New Orleans (242 μg/kg) and Shanghai (665.8 μg/kg) [27,28,29,30,31], the average concentration of 1089.69 μg/kg found in this study was much higher. However, compared with the PAH concentration of 1840 μg/kg in urban surface soil of Tianjin [32], the PAH concentration in this study was lower. According to the soil quality standard of Canada, the reference value of BaP in agricultural land is 100 μg/kg [33]. BaP has also been classified as group 1 toxic in regard toits carcinogenicity to humans by the IARC (International Agency for Research on Cancer) [34]. In this work, BaP concentrations in five samples (px4, px6, yz1, yz2 and yz3) exceeded the reference value (Figure 2).


Spatial Variability of PAHs and Microbial Community Structure in Surrounding Surficial Soil of Coal-Fired Power Plants in Xuzhou, China
PAHs concentrations and TOM content in each soil sample (see supplementary material).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5036711&req=5

ijerph-13-00878-f002: PAHs concentrations and TOM content in each soil sample (see supplementary material).
Mentions: As shown in Figure 2, the total concentration of 15 PAHs in soils ranged from 164.87 to 3494.81 μg/kg dry weight with an average concentration of 1089.69 μg/kg. According to the grading criteria, the PAHs pollution levels in the study area rangedfrom no pollution to severe pollution. At sites px6 and yz3, two highest PAHs concentration were observed (3412.64 and 3494.81 μg/kg). Compared with the PAH concentrations reported in farmland or suburb soil of Korea (236 μg/kg), Switzerland (225 μg/kg), Malaysia (155 μg/kg), New Orleans (242 μg/kg) and Shanghai (665.8 μg/kg) [27,28,29,30,31], the average concentration of 1089.69 μg/kg found in this study was much higher. However, compared with the PAH concentration of 1840 μg/kg in urban surface soil of Tianjin [32], the PAH concentration in this study was lower. According to the soil quality standard of Canada, the reference value of BaP in agricultural land is 100 μg/kg [33]. BaP has also been classified as group 1 toxic in regard toits carcinogenicity to humans by the IARC (International Agency for Research on Cancer) [34]. In this work, BaP concentrations in five samples (px4, px6, yz1, yz2 and yz3) exceeded the reference value (Figure 2).

View Article: PubMed Central - PubMed

ABSTRACT

This work investigated the spatial profile and source analysis of polycyclic aromatic hydrocarbons (PAHs) in soil that surrounds coal-fired power plants in Xuzhou, China. High-throughput sequencing was employed to investigate the composition and structure of soil bacterial communities. The total concentration of 15 PAHs in the surface soils ranged from 164.87 to 3494.81 μg/kg dry weight. The spatial profile of PAHs was site-specific with a concentration of 1400.09–3494.81 μg/kg in Yaozhuang. Based on the qualitative and principal component analysis results, coal burning and vehicle emission were found to be the main sources of PAHs in the surface soils. The phylogenetic analysis revealed differences in bacterial community compositions among different sampling sites. Proteobacteria was the most abundant phylum, while Acidobacteria was the second most abundant. The orders of Campylobacterales, Desulfobacterales and Hydrogenophilales had the most significant differences in relative abundance among the sampling sites. The redundancy analysis revealed that the differences in bacterial communities could be explained by the organic matter content. They could also be explicated by the acenaphthene concentration with longer arrows. Furthermore, OTUs of Proteobacteria phylum plotted around particular samples were confirmed to have a different composition of Proteobacteria phylum among the sample sites. Evaluating the relationship between soil PAHs concentration and bacterial community composition may provide useful information for the remediation of PAH contaminated sites.

No MeSH data available.


Related in: MedlinePlus