Application of multivariate spatial analysis in scale-based distribution and source study of PAHs in the topsoil: an example from Tianjin,China |
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Authors: | X J Wang R M Liu K Y Wang J D Hu Y B Ye S C Zhang F L Xu S Tao |
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Institution: | (1) College of Environmental Sciences, MOE Lab. of Earth Surface Process, Peking University, 100871 Beijing, People’s Republic of China |
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Abstract: | Polycyclic aromatic hydrocarbons (PAHs) in soil originate 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 scale (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. |
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Keywords: | PAHs Multi-scale spatial distribution Sources Tianjin China |
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