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ID 21139
JaLCDOI
Sort Key
10
タイトル(別表記)
Isotopic Analysis of Rb and Sr Using a Full Automatic Thermal Ionization Mass Spectrometer
フルテキストURL
著者
加々美 寛雄 温泉地質学部門
岡野 修 温泉地質学部門
須藤 宏 温泉地質学部門
本間 弘次 温泉地質学部門
抄録
Analytical method for strontium isotope ratios and rubidium and strontium concentrations has been established using a full automatic thermal ionization mass spectrometer. The machine is a modified model "MAT 260" of Varian MAT LTD. Each of simultaneously loaded thirteen samples is successively analysed full automatically following to a specific controling program which has been selected as being most suitable for each sample. However, the most characteristic feature of this machine compared to other types is computer controled peak jumping and peak centering before measurment of the signal of each peak. By this the accuracy of isotopic measurement has been surprisingly improved. Analytical procedures are described in detail which include decomposition of samples, separation of Rb and Sr, loading samples on filament and mass spectrometry. Accuracy and reproducibility of isotope analyses are excellent : 43 separate analyses of standard sample NBS 987 over one year gave a mean (87)Sr/(86)Sr ratio of 0.710238 (normalized to the (88)Sr/(86)Sr ratio of 8.375209) with a value of 20δ of 0.000008. The ratio obtained is slightly higher than the value of 0.71014 given by NBS, but it is almost identical to the mean of recently reported twenty analyses. Our determinations for Rb and Sr concentrations of standard samples are as follows : JG-1, Rb 184.4 ppm, Sr 185.5 ppm; JB-l, Rb 41.5Ppm, Sr 448.4 ppm , each of which is near the mean of reported values for corresponding element of the sample (ANDO et al., 1974). Concentrations of Rb and Sr in pure water and regents used in chemical treatement of samples were also measured; a possible error due to the contamination is negligible for most geochemical samples.
備考
原著論文 (Original Papers)
出版物タイトル
岡山大学温泉研究所報告
発行日
1982-03-25
52巻
出版者
岡山大学温泉研究所
出版者(別表記)
Institute for Thermal Spring Research, Okayama University
開始ページ
51
終了ページ
70
ISSN
0369-7142
NCID
AN00032853
資料タイプ
紀要論文
OAI-PMH Set
岡山大学
言語
Japanese
論文のバージョン
publisher
NAID
Eprints Journal Name
mmc