하천 및 호소 내 퇴적물 재부유에 따른 중금속 및영양염류 용출량 평가기법 동향

Abstract

The phenomenon of sediment resuspension in rivers and lakes causes contaminants (heavy metals and nutrients)accumulated in the sediment to leach into the overlying water. As a result, it can lead to changes in toxic effects andeutrophication in the aquatic ecosystem. In this regard, it is important to quantitatively determine the amount ofcontaminants leached during sediment resuspension. In this study, methods for assessing the amount of releasedcontaminants and the types of contaminants potentially released due to sediment resuspension were studied andsummarized. Methods for assessing leaching can be divided into three groups based on the principle of causingresuspension: (i) the oscillating grid chamber method, (ii) the mechanical stirrer method, and (iii) the shaker method. Itwas confirmed that the types of contaminants that can potentially be released include heavy metals bound to sulfides, aswell as exchangeable and labile forms of heavy metals and nutrients. To effectively manage stable aquatic ecosystems inthe future, a simplified leaching test method is needed to assess in advance the risks (i.e., changes in toxic effects andeutrophication) that sediment resuspension may pose to aquatic ecosystems.