HR: 0800h
AN: A51A-0030    [Abstracts]
TI: Long-Range Transport of Perchlorate Observed in the Atmospheric Aerosols Collected at Okinawa Island, Japan
AU: * Handa, D
EM: k078305@eve.u-ryukyu.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213, Japan
AU: Okada, K
EM: k058552@eve.u-ryukyu.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213, Japan
AU: Kuroki, Y
EM: s0730508@ipe.tsukuba.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213, Japan
AU: Nakama, Y
EM: yotchin-11.raccoon-q.e.d-10@docomo.ne.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213, Japan
AU: Nakajima, H
EM: k068555@eve.u-ryukyu.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213, Japan
AU: Arakaki, T
EM: arakakit@sci.u-ryukyu.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213, Japan
AU: Tanahara, A
EM: tanahara@lab.u-ryukyu.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213, Japan
AU: Oomori, T
EM: oomori@sci.u-ryukyu.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213, Japan
AU: Miyagi, T
EM: miyagto@pref.okinawa.lg.jp
AF: Okinawa Prefectural Institute of Health and Environment, 2085 Aza Oozato, Oozato, Nanjo- shi, Okinawa, 901-1202, Japan
AU: Kadena, H
EM: kadenahs@pref.okinawa.lg.jp
AF: Okinawa Prefectural Institute of Health and Environment, 2085 Aza Oozato, Oozato, Nanjo- shi, Okinawa, 901-1202, Japan
AU: Ishizaki, T
EM: ishizaki@dionex.co.jp
AF: Nippon Dionex K. K., Kyushu Office, Sigma Hakata Bldg, 1F, 1-28, Gion-cho, Fukuoka, 812- 0038, Japan
AU: Nakama, F
EM: fukukazu.nakama@kadena.af.mil
AF: US Air Force Det3, AFIOH Unit 5213, APO AP, Okinawa, 96368-5213, Japan
AB: The study of perchlorate has become quite active in the U.S. in the last several years. Perchlorate has been recognized as a new environmental pollutant and it attracted much attention quickly in the world. The health concern about perchlorate stems from the fact that it displaces iodide in the thyroid gland, while iodine-containing thyroid hormones are essential for proper neural development from the fetal stage through the first years of life. In this study, we determined the concentrations of perchlorate ion present in the atmospheric aerosols collected in Okinawa Island, Japan. We then examined the relationships between the perchlorate concentrations and the environmental parameters and the climatic conditions peculiar to Okinawa. Bulk aerosol samples were collected on quartz filters by using a high volume air sampler at Cape Hedo Atmosphere and Aerosol Monitoring Station (CHAAMS). Each sampling duration was one week. The quartz filters with aerosols were stirred with Milli-Q pure water for three hours before perchlorate ion was extracted. The extracted perchlorate ion concentrations were determined by ion chromatography (ICS-2000, DIONEX). The mean perchlorate concentration for the samples collected at CHAAMS was 1.83 ng/m³, and the minimum was 0.18 ng/m³. The samples collected during November 21-27, 2005, January 23-30, 2006 and April 24-01, 2006 had highest perchlorate concentrations. For these three samples, we performed back trajectory analysis, and found that the air mass for the three samples arrived from the Asian continent. A relatively strong correlation (r² = 0.55) was found between perchlorate and nss-sulfate concentrations for the CHAAMS samples. Furthermore, we analyzed perchlorate in the soils and the fertilizers used for sugar cane farming around the CHAAMS area. The Milli-Q extract of the soil and the fertilizers did not contain any detectable levels of perchlorate ions. Therefore, it was suggested that perchlorate found in the atmospheric aerosols collected at CHAAMS was probably transported from the Asian continent.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0322 Constituent sources and sinks
DE: 0330 Geochemical cycles (1030)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting