제주도 해빈 퇴적물의 유기물 및 미량금속 농도 분포와 오염도 평가

Abstract

We measured the concentrations of organic matter (acid volatile sulfide, chemical oxygen demand, and ignition loss) and trace metals (As, Cd, Cr, Cu, Fe, Hg, Mn, Pb, and Zn) in beach sediments of Jeju Island to evaluate organic matter and trace metal pollution in the environment. Organic matter concentrations were similar at each station and were lower than the sediment quality guidelines (SQGs). The trace metal concentrations differed significantly between stations and decreased in the following order: Fe>Mn>Zn>Cr>As>Cu>Pb>Cd>Hg. In particular the concentrations of As, Cd, and Zn in the study regions were significantly higher than those in Korean intertidal sediments. Based on the assessment results for trace metal pollution using SQGs, the enrichment factor, geoaccumulation index, and pollution load index, the beach sediments around Jeju Island were practically unpolluted with Cd, Cr, Cu, Hg, Mn, and Pb; moderately polluted with Zn; and strongly polluted with As. More intensive monitoring is required to determine the potential sources and understand the geochemical cycles of organic matter and trace metals in beach sediments around Jeju Island.