『Abstract
Polycyclic aromatic hydrocarbon (PAHs) in soil originated from
various sources under different spatial scales. Coregionalization
analysis is more revealing than univariate geostatistical analysis.
Scale-dependent spatial features of variables reflect different
sources of spatial variability. In this study, 188 topsoil samples
in the Tianjin area were collected. The contents of 16 PAHs and
soil background properties were determined for all samples. A
multivariate geostatistical approach was used for multi-scale
spatial analysis for PAH compounds. Results show that coal combustion
was the major source for the spatial distribution patterns of
PAHs in the topsoil of the studied area. It worked mainly at the
short-range scales (5-10 km). Significant spatial variation patterns
were identified. In contrast, no significant spatial distribution
trends at the nugget (0-5 km) or long-range scales (10-50 km)
were seen. Long-range transport and site contamination of PAHs
might not be key contributors in forming the distribution pattern
of PAHs in the topsoil of Tianjin area.
Keywords: PAHs; Multi-scale spatial distribution; Sources; Tianjin;
China』
Introduction
Experimental section
Sampling
Sample extraction, cleanup and analysis
Data analysis
Results and discussion
Coregionalization analysis
Structural correlation coefficients and regionalized factors
Cokriging analysis for PAHs, soil properties and regionalized
factors
Sources of PAH contamination
Conclusion
Acknowledgments
References