Short CommunicationGlomalin-related soil protein enhances the availability of polycyclic aromatic hydrocarbons in soil

- GRSP enhances the availability of phenanthrene in soil.
- GRSP addition increases the n-butanol-extractable amount and desorption of phenanthrene in soil.
- GRSP addition reduces SOM in soil solids and increases DOM in solution.

This is the first observation of glomalin-related soil protein (GRSP)-enhanced availability of phenanthrene as a representative polycyclic aromatic hydrocarbon (PAH) in soils based on an n-butanol extraction procedure and a desorption batch assay. The butanol-extractable amount of phenanthrene increased ∼204.4% in soils with GRSP added at 0-25 mg/kg. Phenanthrene desorption in soils increased monotonically with the increase of added GRSP concentration (0-50 mg/L) in solution. GRSP addition led to reduced soil organic matter in soil solids and increased concentrations of dissolved organic matter in solution, which dominates the mechanism of GRSP-enhanced phenanthrene availability. The results provide insight into the role of GRSP in soil PAH availability, and will be beneficial for risk assessment and remediation strategies at PAH-contaminated sites.

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