Economic and Environmental Geology

Fig. 4.

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Fig. 4. Spatial distributions of As concentrations in the study area: (a) the results of ordinary kriging (OK) using 49 training data; (b) and (c) the results of ordinary co-kriging (OCK) and Gaussian Mixture Model (GMM), respectively, using 49 training data and 156 auxiliary data (As determined by PXRF for OCK and ICP-AES Pb, Cu, Ni, and Zn and PXRF As, Pb, and Cu for GMM); (d) the most realistic distribution of contamination that was estimated by OK using all the ICP-AES data (n=153). The black line indicates the regulatory level (25 mg/kg) by the Soil Environmental Conservation Act of the Republic of Korea.
Econ. Environ. Geol. 2022;55:353-66
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