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The pollution of riverbed sediments originating from soils derived from volcanic ash on Jeju Island was assessed. Organic matter (IL), nutrients (TN, TP), and heavy metals (Pb, Zn, Cu, Cd, Hg, As, Cr, Ni) in the sampled sediments were analyzed, and the pollution status was assessed to identify whether it is of anthropogenic or natural origin. The pollution levels for the parameters were determined as Class IV for TP and Class II for Hg, Cr, and Ni. The pollution status of two out of three sampling stations exhibited Very Poor status, due to high TP content. The third site was noted to have a Fair status because of the measure Class II Cr and Ni pollution levels. The TP, Cr, and Ni levels of the Jeju Island river sediments were compared with measurements from previous studies, which showed that these levels are similar to those found in original volcanic ash soils. This implies that the high levels of the pollutants are attributed to soils originating from natural volcanic activity. Therefore, the river sediments originating from Jeju Island must be assessed using different criteria that reflect the unique geological characteristics of the Jeju soils.

Assessment of Riverbed Sediments Originated from Volcanic Ash Soils in Jeju Island