토양 중 이온용출의 온도의존성에 대한 연구

In general, chloride and sulfate ions in soil can be extracted with deionized water and then each ion can be measured by a wet chemistry method or an ion chromatography method. The Korea Standard Method for Soil Samples does not include methods for chloride and sulfate ion. The method for evaluating the degree of soil corrosion is used to determine chloride and sulfate ions in soil. In the method, chloride and sulfate ions are extracted from soil samples and then analyzed by a wet chemical or an ion chromatographic method described in the Korean Drinking Water Analytical Method and in KS I ISO 11 11048. In this study, extraction efficiencies of chloride and sulfate ions from soil samples at different temperatures were investigated. In short, extraction of sulfate ion from soil was more influenced by temperature change than that of chloride ion. This phenomenon could be explained by the drastic change of the solubility of sulfate salts and nearly constant solubility of chloride salts. It was also observed that the contact time of the soil and extractant might result in the increase of extracted sulfate ions.