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Assessment of Potential Location of High Arsenic Contamination Using Fuzzy Overlay and Spatial Anisotropy Approach in Iron Mine Surrounding Area

机译：基于模糊叠加和空间各向异性方法的铁矿围岩区高砷污染潜力评估。

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摘要

Fuzzy overlay approach on three raster maps including land slope, soil type, and distance to stream can be used to identify the most potential locations of high arsenic contamination in soils. Verification of high arsenic contamination was made by collection samples and analysis of arsenic content and interpolation surface by spatial anisotropic method. A total of 51 soil samples were collected at the potential contaminated location clarified by fuzzy overlay approach. At each location, soil samples were taken at the depth of 0.00-1.00 m from the surface ground level. Interpolation surface of the analysed arsenic content using spatial anisotropic would verify the potential arsenic contamination location obtained from fuzzy overlay outputs. Both outputs of the spatial surface anisotropic and the fuzzy overlay mapping were significantly spatially conformed. Three contaminated areas with arsenic concentrations of 7.19 ± 2.86, 6.60 ± 3.04, and 4.90 ± 2.67 mg/kg exceeded the arsenic content of 3.9 mg/kg, the maximum concentration level (MCL) for agricultural soils as designated by Office of National Environment Board of Thailand. It is concluded that fuzzy overlay mapping could be employed for identification of potential contamination area with the verification by surface anisotropic approach including intensive sampling and analysis of the substances of interest.
机译：在三个栅格地图上的模糊叠加法（包括土地坡度，土壤类型和河流距离）可用于确定土壤中高砷污染的最可能位置。通过收集样品并通过空间各向异性方法分析砷含量和内插表面来验证高砷污染。通过模糊叠加法在澄清的潜在污染地点收集了总共51个土壤样品。在每个位置，在距地表0.00-1.00 m的深度处取样。使用空间各向异性对被分析的砷含量进行插值表面将验证从模糊叠加输出获得的潜在砷污染位置。空间表面各向异性和模糊覆盖贴图的两个输出都在空间上显着一致。三个污染区的砷浓度分别为7.19±2.86、6.60±3.04和4.90±2.67kgmg / kg，超过了3.9 mg / kg的砷含量，这是国家环境局办公室指定的农业土壤的最大浓度水平（MCL）泰国。结论是，可以通过表面各向异性方法（包括密集采样和感兴趣物质的分析）进行验证，将模糊覆盖图法用于识别潜在污染区域。

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