Analytical Sciences

Abstract − Analytical Sciences, 34(4), 471 (2018).

Ultrasonic Mist Generation Assist Argon–Nitrogen Mix Gas Effect on Radioactive Strontium Quantification by Online Solid-Phase Extraction with Inductively Coupled Plasma Mass Spectrometry
Makoto FURUKAWA,*1,*2,*3 Makoto MATSUEDA,*1 and Yoshitaka TAKAGAI*1,*4
*1 Faculty of Symbiotic Systems Science, Cluster of Science and Technology, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan
*2 Faculty of Agriculture, University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan
*3 PerkinElmer Japan Co., Ltd., 134 Godo, Hodogaya, Yokohama, Kanagawa 240-0005, Japan
*4 Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima, 960-1296, Japan
The Ar–N2 mix gas effect can easily improve the sensitivity of ICPMS; however, this effect discriminates against Sr. In this study, it was found that Ar–N2 mixed gases introduced into nebulizing gas enhanced the sensitivity of online solid-phase extraction (SPE) with inductively coupled plasma mass spectrometry (ICPMS) for radioactive strontium quantification. An ultrasonic nebulizer (USN) improved the Ar–N2 mixture gases effect of Sr and the mix gases (with USN) enhanced 3.7-times the signal intensity of Sr in normal pure Ar gas (with USN) in an online SPE-ICPMS. By adapting the gas-loading means from a nebulizing gas unit via USN, no careful tuning was necessary for the plasma turning. With this signal enhancement, a 0.06 pg/L detection limit (0.3 Bq/L) was achieved for radioactive strontium (90Sr) in online SPE-ICPMS within 30 min. In addition, environmental paddle water in the Fukushima Nuclear Power Plant was measured and the valued correspond to that obtained by radiometry.