Spatial Distribution of As-Concentrations in the Contaminated Site by the Highly Toxic As-Chemicals

Abstract:

A total of 2668 surface soil samples (-0.5 m ~ 0 m) and 637 sub-layer soil samples (-1.0 m ~ -0.5 m) were collected from a contaminated site with an area of 26.19 hectares and analyzed the concentration of arsenic, so as to get the spatial distribution of arsenic concentrations in the soil contaminated by highly toxic As-chemicals. The results indicated that spatial correlation of arsenic content in surface soil was moderate. The optimal semivariogram model was the exponential model, and the best interpolation model was simple Kriging interpolation. The arsenic content of sub-layer was similar to that of surface soil in space structure, but weakly correlated. Analysis on the arsenic content in vertical sections showed that contamination was mainly concentrated in surface soil. The arsenic content in most of the collected samples reduced as the soil layer depth increased. Spatial variability of arsenic could be significantly affected by anthropogenic factors such as excavation & destruction of highly toxic As-chemicals and farming.

• Periodical: Advanced Materials Research (Volume 878)
• Pages: 797-805
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.878.797
• Online since: January 2014
• Authors: Feng Wu Peng, Ting Zhou, Shuan Jin Wei, Li Juan You, Xue Feng Wang, Ning Wang
• Keywords: As-Contaminated Soil, Geostatistics, Highly Toxic As-Chemicals, Semivariogram, Spatial Variability

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