This study investigated the probability of arsenic concentrations based on geological distribution using GIS and actual soil contamination surveys. To this end, isoconcentration curves were created by applying soil pollutant survey data from uncontaminated areas to the Surfer program. QGIS was used to overlay and visualize the previously created isoconcentration curves with a geological map to identify the relationship between geological structure and the distribution of arsenic concentrations in soil. Analysis of the soil survey data in conjunction with the geological map revealed that the top five areas with high arsenic concentrations were limestone and granite layers, accounting for 50% of the total, out of a total of 24 strata. Analysis of 89 strata in the top 20 areas centered on arsenic concentrations revealed that granite and limestone layers accounted for a high proportion of 40.4% of the total, indicating that areas with high soil arsenic concentrations are formed by granite and limestone layers. In conclusion, we were able to confirm that the actual distribution of arsenic concentrations in soils varies according to geological distribution, and that there is a possibility of a correlation between specific geological layers and soil arsenic concentrations. Future additional research is expected to be useful for identifying the direct and indirect distribution of arsenic concentrations according to geological distribution during large-scale environmental impact assessments and soil contamination investigations.

Keywords: Arsenic distribution, Geographic information system, Strata