Abstract
Accurate monitoring of degradation levels in soils is essential in order to understand and achieve complete degradation of petroleum hydrocarbons in contaminated soils. We aimed to develop the use of multivariate methods for the monitoring of biodegradation of diesel in soils and to determine if diesel contaminated soils could be remediated to a chemical composition similar to that of an uncontaminated soil. An incubation experiment was set up with three contrasting soil types. Each soil was exposed to diesel at varying stages of degradation and then analysed for key hydrocarbons throughout 161 days of incubation. Hydrocarbon distributions were analysed by Principal Coordinate Analysis and similar samples grouped by cluster analysis. Variation and differences between samples were determined using permutational multivariate analysis of variance. It was found that all soils followed trajectories approaching the chemical composition of the unpolluted soil. Some contaminated soils were no longer significantly different to that of uncontaminated soil after 161 days of incubation. The use of cluster analysis allows the assignment of a percentage chemical similarity of a diesel contaminated soil to an uncontaminated soil sample. This will aid in the monitoring of hydrocarbon contaminated sites and the establishment of potential endpoints for successful remediation.
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Abbreviations
- HC:
-
Hydrocarbons
- PAH:
-
Polycyclic aromatic HC
- GCMS:
-
Gas Chromatography Mass Analysis
- UCM:
-
Unresolved complex mixture
- PCA:
-
Principal Components Analysis, MDS, non-metric Multi Dimensional Scaled plots
- EPA:
-
Environmental Protection Agency
- ASE:
-
Accelerated Solvent Extraction
- PCO:
-
Principal Coordinate Analysis
- PERMANOVA:
-
Permutational multivariate analysis of variance
- MGA:
-
Map Grid of Australia
- ASE:
-
Accelerated Solvent Extractor
- SAA:
-
Saturate and Aromatic
- EMS:
-
Estimates of components of variation
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Funding Sources
Funding for this study was provided by Western Power and Horizon Power. Sampling was conducted by Environmental Resource Management for Horizon Power. Laboratory facilities and equipment were provided by Chemcentre WA.
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Responsible editor: Zhihong Xu
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The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. †This was the primary author. ‡§These authors contributed equally.
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Lin, D.S., Taylor, P. & Tibbett, M. Advanced multivariate analysis to assess remediation of hydrocarbons in soils. Environ Sci Pollut Res 21, 11998–12005 (2014). https://doi.org/10.1007/s11356-014-3140-0
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DOI: https://doi.org/10.1007/s11356-014-3140-0