title: On-line measurement of perchlorate in atmospheric aerosol based on ion chromatograph coupled with particle collector and post-column concentrator.
abstract: An automated analysis system has been developed for measuring perchlorate concentration in atmospheric aerosol. The perchlorate in aerosol sample, which has been collected with water mist in a hydrophobic filter/mist chamber based particle collector, is continuously preconcentrated. The matrix ions such as sulfate are subsequently removed from the preconcentrator. The remaining perchlorate is then analyzed on-line with an ion chromatograph in conjunction with a Nafion membrane tube based post-column concentrator. The sensitivity is increased by a factor of 7.7 with the post-column concentration technique. The proposed system has been successfully operated at Tokushima, Japan. The limit of detection is 0.35 ng/m(3) for 3 h sampling cycle. The perchlorate concentration in the atmospheric aerosol averaged 1.01±1.75 ng/m(3) (n=12).
authors: Institute of Health Biosciences, The University of Tokushima, 1-78-1 Shomachi, Tokushima 770-8505, Japan. takeuchi@ph.tokushima-u.ac.jp
authors: Masaki
authors: M
authors: Takeuchi
authors: Kaoru
authors: K
authors: Yoshioka
authors: Yusuke
authors: Y
authors: Toyama
authors: Ai
authors: A
authors: Kagami
authors: Hideji
authors: H
authors: Tanaka