Furukawa Makoto, Matsueda Makoto, Takagai Yoshitaka
Faculty of Symbiotic Systems Science, Cluster of Science and Technology, Fukushima University.
Faculty of Agriculture, University of Tokyo.
Anal Sci. 2018 Apr 10;34(4):471-476. doi: 10.2116/analsci.17P483. Epub 2018 Mar 20.
The Ar-N mix gas effect can easily improve the sensitivity of ICPMS; however, this effect discriminates against Sr. In this study, it was found that Ar-N 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-N 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 (Sr) 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.
氩-氮混合气体效应能够轻易提高电感耦合等离子体质谱仪（ICPMS）的灵敏度；然而，这种效应会对锶产生歧视。在本研究中，发现引入雾化气体中的氩-氮混合气体增强了采用电感耦合等离子体质谱法（ICPMS）进行在线固相萃取（SPE）定量分析放射性锶时的灵敏度。在在线固相萃取-电感耦合等离子体质谱仪（SPE-ICPMS）中，超声雾化器（USN）改善了锶的氩-氮混合气体效应，且混合气体（搭配USN）使锶在正常纯氩气（搭配USN）中的信号强度提高了3.7倍。通过采用经由超声雾化器从雾化气体单元加载气体的方式，无需对等离子体启动进行精细调节。借助这种信号增强，在线固相萃取-电感耦合等离子体质谱仪（SPE-ICPMS）在30分钟内实现了对放射性锶（Sr）0.06 pg/L的检测限（0.3 Bq/L）。此外，对福岛核电站的环境桨叶水进行了测量，其数值与辐射测量法所得结果一致。
