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Furukawa M, Takagi K, Matsunami H, Komatsuzaki Y, Kawakami T, Shinano T, Takagai Y. Rapid Quantification of Radioactive Strontium-90 in Fresh Foods via Online Solid-Phase Extraction-Inductively Coupled Plasma-Dynamic Reaction Cell-Mass Spectrometry and Its Comparative Evaluation with Conventional Radiometry. ACS OMEGA 2019; 4:11276-11284. [PMID: 31460230 PMCID: PMC6649156 DOI: 10.1021/acsomega.9b01381] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 06/13/2019] [Indexed: 05/15/2023]
Abstract
This paper describes a rapid quantification method for radioactive strontium (90Sr) in fresh foods (perishable foods) and has been comparatively evaluated with the common classical radiometric quantification method. Inductively coupled plasma-dynamic reaction cell-mass spectrometry with online solid-phase extraction (cascade-ICP-MS) rapidly determines 90Sr in a pure water-based sample. Despite its advantages, its application to fresh foods (perishable foods) has not yet been reported; however, the analytical potential of this method for fresh foods must be evaluated. In this study, 90Sr was determined in 12 fresh foods via improved cascade-ICP-MS (Icas-ICP-MS). Addition and recovery tests were demonstrated using real samples of grape, apple, peach, Japanese pear, rice, buckwheat, soybean, spinach, shiitake mushroom, grass, sea squirt, and flounder. With a decomposed solution of Japanese pear, the measurement value coincided with the amount of spiked 90Sr. The reproducibility of the measurements was represented by relative standard deviations of 14.2 and 5.0% for spiked amounts of 20 and 200 Bq/kg, respectively (n = 10), and the recovery rates were 93.7 ± 7.1%. In this case, the limit of detection (LOD) was 2.2 Bq/kg (=0.43 pg/kg). These results were compared with the data obtained using a common classical radiometric quantification method (nitrate precipitation-low background gas flow counter (LBC) method) in the same samples. Both the methods showed equivalent performances with regard to reproducibility, precision, and LODs but different analysis times. Icas-ICP-MS required ∼22 min for analysis, whereas the nitrate precipitation-LBC method required 20 days, confirming that Icas-ICP-MS is the suitable method for analyzing 90Sr in fresh foods.
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Affiliation(s)
- Makoto Furukawa
- Faculty
of Symbiotic Systems Science, Cluster of Science and Technology, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan
- PerkinElmer
Japan Co., Ltd., 134
Godo, Hodogaya, Yokohama, Kanagawa 240-0005, Japan
- Faculty
of Agriculture, University of Tokyo, 1−1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Kyoko Takagi
- Fukushima
Research Station, Tohoku Agricultural Research Center, National Agriculture and Food Research Organization, 50 Harajuku-minami, Arai, Fukushima 960-2156, Japan
| | - Hisaya Matsunami
- Fukushima
Research Station, Tohoku Agricultural Research Center, National Agriculture and Food Research Organization, 50 Harajuku-minami, Arai, Fukushima 960-2156, Japan
| | | | | | - Takuro Shinano
- Fukushima
Research Station, Tohoku Agricultural Research Center, National Agriculture and Food Research Organization, 50 Harajuku-minami, Arai, Fukushima 960-2156, Japan
| | - Yoshitaka Takagai
- Faculty
of Symbiotic Systems Science, Cluster of Science and Technology, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan
- Institute
of Environmental Radioactivity, Fukushima
University, 1 Kanayagawa, Fukushima 960-1296, Japan
- E-mail: (Y.T.)
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