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How surfactants affect the depuration of polycyclic aromatic hydrocarbons adsorbed on the mangrove leaf surfaces: insight from an in situ method

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Abstract

The effects of sodium dodecyl benzene sulfonate (SDBS), polyoxyethylene (20) sorbitan monolaurate (Tween 20), and their mixtures on the depuration of anthracene (Ant) and fluoranthene (Fla) individually adsorbed on the Kandelia obovata (Ko) leaf surfaces were in situ investigated. The Ko original leaf-wax microstructures have been destroyed by SDBS, Tween 20, and their mixtures at or above their critical micelle concentration (CMC). The volatilization rate constants (kV) of the adsorbed PAHs decreased with surfactants at or above their CMC resulting from the plasticizing effect and a decrease in the polarity of the Ko leaf-waxes induced by surfactants. Moreover, the photolysis rate constants (kP) of the adsorbed PAHs decreased with SDBS while increased with Tween 20 and their mixtures at or above their CMC, which can be attributed to effects of surfactants on the light adsorption behavior of Ko leaf-waxes. Overall, the effects of surfactants on the depuration of the adsorbed PAHs were dependent not only on the physical–chemical properties of surfactants but also on the micro-environment of the substrates adsorbed the PAHs. These results are of great significance for further understanding the accumulation of PAHs and could expand our knowledge about the migration mechanism of PAHs from the atmosphere by mangrove leaf surface micro-zones.

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Data availability

All data generated or analyzed during this study are included in this published article (and its supplementary information files).

Abbreviations

SDBS:

Sodium dodecyl benzene sulfonate

Tween 20:

Polyoxyethylene (20) sorbitan monolaurate

Ant:

Anthracene

Fla:

Fluoranthene

K o :

Kandelia obovate

CMC:

Critical micelle concentration

POPs:

Persistent organic pollutants

PAHs:

Polycyclic aromatic hydrocarbons

HOCs:

Hydrophobic organic contaminants

Nap:

Naphthalene

Flu:

Fluorine

Phe:

Phenanthrene

Pyr:

Pyrene

LCSM:

Laser confocal scanning microscopy

λ ex :

Excitation wavelength

λ em :

Emission wavelength

SEM:

Scanning electron microscopy

RSD:

Relative standard deviation

k T :

Total depuration rate constants

k V :

Volatilization rate constants

k P :

Photolysis rate constants

C V1 :

The percentage contributions of volatilization

C P1 :

The percentage contributions of photolysis

LT:

Light-treated

DT:

Dark-treated

S:T:

Mass ratios of SDBD to Tween 20

Brij35:

Polyoxyethyleneglycol dodecyl ether

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Acknowledgements

The authors would like to acknowledge senior engineer Fang Wu of College of the Environment and Ecology (Xiamen University) for helping to use the apparatus.

Funding

We acknowledge financial support from the National Natural Science Foundation of China (No. 21627814).

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Authors and Affiliations

Authors

Contributions

Shuai Guo: Conceptualization, Methodology, Software, Validation, Formal analysis, Investigation, Writing-Original Draft, Visualization. Chaoxian Wei: Software, Validation, Formal analysis, Resources, Visualization. Yaxian Zhu: Data curation, Visualization, Project administration. Yong Zhang: Conceptualization, Methodology, Validation, Formal analysis, Writing-Review and Editing, Supervision, Project administration, Funding acquisition.

Corresponding author

Correspondence to Yong Zhang.

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Competing interests

The authors declare no competing interests.

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Responsible Editor: Ester Heath

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Guo, S., Wei, C., Zhu, Y. et al. How surfactants affect the depuration of polycyclic aromatic hydrocarbons adsorbed on the mangrove leaf surfaces: insight from an in situ method. Environ Sci Pollut Res 29, 31413–31425 (2022). https://doi.org/10.1007/s11356-021-18469-0

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  • DOI: https://doi.org/10.1007/s11356-021-18469-0

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