Influence of hydroxypropyl-β-cyclodextrin on the biodegradation of 14C-phenanthrene and 14C-hexadecane in soil

Stroud, Jacqueline L.; Tzima, Marina; Paton, Graeme I.; Semple, K. T.

Influence of hydroxypropyl-β-cyclodextrin on the biodegradation of 14C-phenanthrene and 14C-hexadecane in soil

2009

Stroud, Jacqueline L. | Tzima, Marina | Paton, Graeme I. | Semple, K. T. (Kirk T)

Soil was spiked with [9-¹⁴C]phenanthrene and [1-¹⁴C]hexadecane at 50 mg kg⁻¹ and aged for 1, 25, 50, 100 and 250 d. At each time point, the microcosms were amended with aqueous solutions of cyclodextrin (HP-β-CD) at a range of concentrations (0-40 mM). Mineralisation assays and aqueous HP-β-CD extractions were performed to assess the effect of the amendments on microbial degradation. The results showed that amendments had no significant impact on the microbial degradation of either of the ¹⁴C-contaminants. Further, HP-β-CD extractions were correlated with the mineralisation of the target chemicals in each of the soil conditions. It was found that the HP-β-CD extraction was able to predict mineralisation in soils which had not been amended with cyclodextrin; however, in the soils containing the HP-β-CD, there was no predictive relationship. Under the conditions of this study, the introduction of HP-β-CD into soils did not enhance the biodegradation of the organic contaminants. The amendment of HP-β-CD to phenanthrene and hexadecane amended soils does not enhance microbial biodegradation.

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