Relationships between aging of PAHs and soil properties

Luo, Lei; Shu, Lin; Huang, Honglin; Zhang, Shuzhen

doi:10.1016/j.envpol.2012.07.003

Cited by 114 publications

(89 citation statements)

References 32 publications

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“…This 17 was opposed to the inverse proportionality, reported in the majority of studies, between 18 the OC content of a soil and the extractability of the sorbed contaminants. This 19 phenomenon could be due to a higher microporosity of soils with low OC content 20 (Ncibi et al 2007;Luo et al 2012), and/or to differences in the quality of their OM. 21 The different microporosity of the three soils studied is not likely the cause of such 22 behaviour because, as observed in Table SD2, microporosity follows the sequence: soil 23 3 > soil 2 > soil 1.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

Effect of contact time and the use of hydroxypropyl-β-cyclodextrin in the removal of fluorene and fluoranthene from contaminated soils

Morillo

Sánchez-Trujillo

Villaverde

et al. 2014

Science of The Total Environment

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14Sorption-desorption experiments of fluorene (FLU) and fluoranthene (FLT) in soils 15were carried out and correlated to their removal from aged contaminated soils using 16 aqueous solutions in the absence and in the presence of hydroxypropyl-β-cyclodextrin 17 (HPBCD) as the extraction agent. FLU became more resistant to extraction in aged 18 contaminated soils due to its initial adsorption onto the mineral and amorphous soil 19 organic matter (SOM) domains, sites of lower binding energy from which, due to its 20 small size, it could spread towards the condensed SOM as the contact time increased. 21Therefore, FLU will not be easily desorbed from aged contaminated soils due to 22 physical entrapment mechanisms, even when using HPBCD as extractant, presenting 23 FLU low risks to the environment. On the contrary, FLT was extracted from aged soils 24 in the presence of HPBCD in solutions to a much greater extent than in its absence. Due 25 to its more hydrophobic character FLT sorption in soils was relatively quicker, 26 remaining more or less fixed on hydrophobic sites of the organic matter (OM) with 27 different energies, and therefore the amount of FLT extracted was almost constant for 28 different ageing times. During extraction experiments, the influence of the OM quality 29 of the soils was also highlighted because an inverse proportionality between OM 30 content of soil and extractability of sorbed FLT was observed. It was concluded that 31Preprint submitted to Elsevier 2 soils with lower OM content that had more diagenetically processed OM could block 1 the extraction of FLT more effectively than soils with higher OM content that are less 2 humified. This indicates the need to not only use adsorption-desorption data in 3 contaminant fate and transport models, but also extraction studies in aged contaminated 4 soils and other complementary analytical approaches when assessing soil 5 contamination-related risks. 6 7 8

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Section: Infrared Spectroscopymentioning

confidence: 99%

Effect of contact time and the use of hydroxypropyl-β-cyclodextrin in the removal of fluorene and fluoranthene from contaminated soils

Morillo

Sánchez-Trujillo

Villaverde

et al. 2014

Science of The Total Environment

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“…The aqueous solubility and, as a consequence, the bioavailability of PAHs decrease with increasing number of aromatic rings (Peng et al 2008). In addition, many studies have demonstrated that the extractability and the bioavailability of PAHs decrease significantly with time in the aging processes (Northcott and Jones 2001;Luo et al 2012). Most PAHs released into the environment will finally enter into the soil ecosystem, where they will impair human and other organisms through the food chain (Fismes et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Response of bacterial pdo1, nah, and C12O genes to aged soil PAH pollution in a coke factory area

Han

Liu

Zheng

et al. 2014

Environ Sci Pollut Res

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Soil pollution caused by polycyclic aromatic hydrocarbons (PAHs) is threatening human health and environmental safety. Investigating the relative prevalence of different PAH-degrading genes in PAH-polluted soils and searching for potential bioindicators reflecting the impact of PAH pollution on microbial communities are useful for microbial monitoring, risk evaluation, and potential bioremediation of soils polluted by PAHs. In this study, three functional genes, pdo1, nah, and C12O, which might be involved in the degradation of PAHs from a coke factory, were investigated by realtime quantitative PCR (qPCR) and clone library approaches. The results showed that the pdo1 and C12O genes were more abundant than the nah gene in the soils. There was a significantly positive relationship between the nah or pdo1 gene abundances and PAH content, while there was no correlation between C12O gene abundance and PAH content. Analyses of clone libraries showed that all the pdo1 sequences were grouped into Mycobacterium, while all the nah sequences were classified into three groups: Pseudomonas, Comamonas, and Polaromonas. These results indicated that the abundances of nah and pdo1 genes were positively influenced by levels of PAHs in soil and could be potential microbial indicators reflecting the impact of soil PAH pollution and that Mycobacteria were one of the most prevalent PAHs degraders in these PAH-polluted soils. Principal component analysis (PCA) and correlation analyses between microbial parameters and environmental factors revealed that total carbon (TC), total nitrogen (TN), and dissolved organic carbon (DOC) had positive effects on the abundances of all PAH-degrading genes. It suggests that increasing TC, TN, and DOC inputs could be a useful way to remediate PAH-polluted soils.

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“…Total C and N were measured with an elemental analyzer (PE2400, PerkinElmer Inc.). Total organic C was determined after acid treatment (10% HCl) to remove inorganic C, and DOC was extracted with 0.01 mol L −1 NaCl at a soil to solution ratio of 1:20 for 6 h (Luo et al, 2012). Total S was determined by ICP-AES after digestion with a mixture of HNO 3 and HClO 4 (85:15 v/v) (Zhao and McGrath, 1994).…”

Section: Sampling and Sample Pretreatmentsmentioning

confidence: 99%

Sulfur Speciation in an Arable Soil as Affected by Sample Pretreatments and Sewage Sludge Application

Luo

et al. 2014

Soil Science Soc of Amer J

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Sulfur speciation under the influence of sample pretreatment and sewage sludge (SS) application in a continuously SS-amended soil was assessed by wetchemical fractionation and S K-edge XANES spectroscopy. Distinct differences in S speciation among the following pretreatments including fresh, air-drying, anoxic freeze-drying, oven-drying, and conditioning (incubation at room temperature and 75% of water holding capacity for 2 wk) were detected in both topsoils and subsoils. Air-drying significantly increased available S content but decreased C-bonded S content in the soils compared with anoxic freeze-drying. Oven-drying and conditioning pretreatments showed a similar effect on S fractions to air-drying in the soils but to a lesser extent. X-ray adsorption nearedge structure analysis showed that both reduced and intermediate organic S tended to decrease while oxidized S obviously increased in the air-dried samples. In contrast, the conditioning pretreatment facilitated the transformation of intermediate S into reduced organic S. Continuous application of SS significantly increased total soil S, C-bonded S, and residual S contents but decreased available S content in the topsoil. Meanwhile, XANES analysis indicated that reduced organic S was markedly increased (over 50% of total S) in the SS-amended topsoil. No obvious effect of the application of SS on S speciation in the subsoil was observed except for the facilitated transportation of S into lower depth. Overall, our results suggest that anoxic atmospheres during the entire pretreatment process from sampling to drying, grinding, and analysis is crucial for the accurate speciation analysis of S in soils, and the anoxic freezedrying is, therefore, highly recommended.

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Relationships between aging of PAHs and soil properties

Cited by 114 publications

References 32 publications

Effect of contact time and the use of hydroxypropyl-β-cyclodextrin in the removal of fluorene and fluoranthene from contaminated soils

Effect of contact time and the use of hydroxypropyl-β-cyclodextrin in the removal of fluorene and fluoranthene from contaminated soils

Response of bacterial pdo1, nah, and C12O genes to aged soil PAH pollution in a coke factory area

Sulfur Speciation in an Arable Soil as Affected by Sample Pretreatments and Sewage Sludge Application

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