N2-Ar mix gas effect can easily improve the sensitivity of ICPMS; however, this effect discriminates against Sr. In this study, it was found that N2-Ar 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 N2-Ar mixture gases effect of Sr and the mix gases (with USN) enhanced 3.7-times signal intensity of Sr in normal pure Ar gas (with USN) in an online SPE-ICPMS. By adapting the gas-loading means from 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 ( 90 Sr) in online SPE-ICPMS within 30 min. In addition, environmental paddle water in Fukushima NuclearPower Plant was measured and the valued correspond to that obtained by radiometry.
Simultaneous isotope speciation of various Pu isotopes is difficult to achieve with conventional inductively coupled plasma–mass spectrometry (ICP–MS) owing to isobaric interferences. In analyzing ICP tandem MS (ICP–MS/MS), CO2 gas reactions in a dynamic reaction cell (DRC) almost eliminated the background noise intensity produced by isobaric interference from isotopes originating from actinides such as Am, Cm, and U at the locations (m/z) of significant Pu isotopes (239Pu, 240Pu, 241Pu, 242Pu, and 244Pu).
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