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Impact of Zn, Cu, Al and Fe on the partitioning and bioaccessibility of (14)C-phenanthrene in soil.

Environmental pollution (Barking, Essex : 1987) (2013-06-19)
Ifeyinwa S Obuekwe, Kirk T Semple
ABSTRACT

This investigation considered the effects of Zn, Cu, Al and Fe (50 and 500 mg kg(-1)) on the loss, sequential extractability, using calcium chloride (CaCl2), hydroxypropyl-β-cyclodextrin (HPCD) and dichloromethane (DCM) and biodegradation of (14)C-phenanthrene in soil over 63 d contact time. The key findings were that the presence of Cu and Al (500 mg kg(-1)) resulted in larger amounts of (14)C-phenanthrene being extracted by CaCl2 and HPCD. Further, the CaCl2 + HPCD extractions directly predicted the biodegradation of the PAH in the presence of the metals, with the exception of 500 mg kg(-1) Cu and Zn. The presence of high concentrations of some metals can impact on the mobility and accessibility of phenanthrene in soil, which may impact on the risk assessment of PAH contaminated soil.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Phenanthrene, 98%
Supelco
Phenanthrene, analytical standard, for environmental analysis
Sigma-Aldrich
Phenanthrene, sublimed grade, ≥99.5%
Supelco
Phenanthrene, certified reference material, TraceCERT®
Supelco
Phenanthrene solution, certified reference material, 5000 μg/mL in methanol