충남 금산군 일대 지하수내 비소의 지구화학적 분포
Geochemical Distribution of Arsenic in Groundwater of the Geumsan Area
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Groundwaters for potable and agricultural uses in the Geumsan area have been surveyed to investigate the occurrence of As and its geochemistry. Among 150 samples, 16 percent of groundwaters had concentrations greater than 10 µg/L rising up to 113 µg/L. Simple Ca-HCO3- types without external pollution and general positive correlations with pH, Ca, SO42- and HCO3- were characteristics of high As (≥10 µg/L) groundwaters. Geochemical parameters such as pH, F, SO42-, HCO3-, Ca, and Mg, showed differences between geological media in contrast to As of narrow variation in contents. This may indicate that As occurrence is more affected by local hydrogeochemical conditions rather than the contents in aquifers. The oxidation reaction of sulfide minerals in metasedimentary rocks and locally mineralized zones seems to be ultimately responsible for the existence of As in groundwater. Desorption process under high pH conditions may also control the As mobility in the study area.
Abstract
Groundwaters for potable and agricultural uses in the Geumsan area have been surveyed to investigate the occurrence of As and its geochemistry. Among 150 samples, 16 percent of groundwaters had concentrations greater than 10 µg/L rising up to 113 µg/L. Simple Ca-HCO3- types without external pollution and general positive correlations with pH, Ca, SO42- and HCO3- were characteristics of high As (≥10 µg/L) groundwaters. Geochemical parameters such as pH, F, SO42-, HCO3-, Ca, and Mg, showed differences between geological media in contrast to As of narrow variation in contents. This may indicate that As occurrence is more affected by local hydrogeochemical conditions rather than the contents in aquifers. The oxidation reaction of sulfide minerals in metasedimentary rocks and locally mineralized zones seems to be ultimately responsible for the existence of As in groundwater. Desorption process under high pH conditions may also control the As mobility in the study area.
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