抄録
Perfluoroalkyl acids (PFAA) are currently drawing attention as major persistent organic pollutants. To examine the effect of Great East Japan Earthquake on the environment, we measured perfluorocarboxylates (C5~C14) and perfluorosulfonates (CS4, CS6, CS8 and CS10) in the seawater sampled from 35 points in Sanriku Offshore in 2011(August to September) using LCMS/MS. The results were compared with the data of C8 and CS8 in the seawater collected in 2003 from four points in Sanriku Offshore. The results of these seawater were also related to the PFAA in the river water, which were collected in 2003 (from 95 sampling points) and 2010 (from 98 sampling Points). In the seawater collected after the tsunami disaster, C5~C12, and CS6 and CS8 were detected. Among PFAA, the geometric mean concentrations were high for C8, C6, C9 and C10 , and they were 0.68, 0.18, 0.14, and 0.11 ng/L respectively. The mean concentration of CS8 was 0.04 ng/L, with the highest point of 0.25 ng/L. The concentration of C8 and CS8 in the seawater collected in 2003 was their detection limits (0.1 ng/L) or less. From 2003 to 2010, the national average river concentrations of C8 and CS8 had a tendency to decrease from 5.4 to 3.2 ng/L and from 2.1 to 1.0 ng/L, respectively. In Hokkaido-Tohoku region, that C8 had a decreasing tendency (from 1.1 to 0.72 ng/L) and CS8 decreased from 1.2 to 0.1 ng/L. From these results, the Tsunami Disaster caused sea pollution of PFAA.
