LONG TERM AND REAL TIME MONITORING OF MULTI-ELEMENTS CONCENTRATION IN AIRBORNE PARTICULATES
Naoki Furuta, Ryohei Fukushi, Yusuke Ono
Chuo University, Japan
A long term monitoring of multi-elements in airborne particulates (APs) had been conducted in Tokyo from 1995 to 2013. Size classified APs were collected on filters for one month and multi-elements in APs were determined by ICPMS after acid digestion (referred to as filter-collection data). The results provide us with an average concentration of elements for one month. However, it was noticed that the lead concentration in individual APs changed three orders of magnitudes. Therefore, APs were introduced into ICPMS directly and real time monitoring was conducted. The particle size of APs introduced into the ICP was restricted to <1 μm.
Calibration was conducted by using an ultrasonic nebulizer with a desolvation system and the real time monitoring data were compared with the filter-collection data.
From a few days to one week real time monitoring of APs was carried out with an interval of 5 min. Recovery of elements was calculated by dividing the real-time monitoring data by the filter-collection data. The recovery of easily vaporized elements was larger than 100%, and that of hardly vaporized elements was less than 100%. It is likely that smaller particles, on which easily vaporized elements were enriched, were not collected on filters. Whereas, larger particles could not be decomposed completely in plasma and that is a reason why the recovery of hardly vaporized elements was less than 100%. In this presentation, the means how to improve the recovery to 100% for all elements will be discussed.
Professor Naoki Furuta is professor in the Department of Applied Chemistry at Chuo University in Tokyo since 1994. Before he moved to Chuo University, he has been working at National Institute for Environmental Studies (NIES) for 19 years (1975-1994). While working at NIES, he gained Doctor of Science from the University of Tokyo in 1979. From 1979 to 1981, he was a postdoctoral fellow at University of Alberta. In 1988 and 2002, he was a visiting scientist at Indiana University. His research interests focus on the identification of sources of toxic elements in environmental samples, elucidation of the role of trace elements in biological samples, and the development of analytical methods such as a laser ablation and on-line micro-column pre-concentration. He and his co-workers have published 85 refereed papers, 7 reviews and 15 books. He has presented 42 invited lectures at national and international conferences. He received Fellow of Royal Society of Chemistry in 2005. He was a member of Editorial Board (2006-2011) of J. of Anal. At. Spectrom. and a member of Editorial Advisory Board (2009-2012) of Appl. Spectro. He is now a member of Advisory Board of J. of Anal. At. Spectrom. He organized the 3rd Asia-Pacific Winter Conference on Plasma Spectrochemistry in 2008.