High precision determination of 228Ra and 228Ra/226Ra isotope ratio in natural waters by MC-ICPMS

被引：14
作者：
Sharabi, Galit [1 ,2 ]
Lazar, Boaz [2 ]
Kolodny, Yehoshua [2 ]
Teplyakov, Nataliya [1 ]
Halicz, Ludwik [1 ]
机构：
[1] Geol Survey Israel, IL-95501 Jerusalem, Israel
[2] Hebrew Univ Jerusalem, Inst Earth Sci, IL-91904 Jerusalem, Israel
来源：
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY | 2010年 / 294卷 / 2-3期
关键词：
Radium isotopes; Ra-226; Ra-228; The Sea of Galilee; MC-ICPMS; PLASMA-MASS-SPECTROMETRY; SUBMARINE GROUNDWATER DISCHARGE; LAKE KINNERET SEA; ENVIRONMENTAL-SAMPLES; RADIUM; EXTRACTION; GALILEE; RA;
D O I：
10.1016/j.ijms.2010.05.011
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
A new methodology has been developed for precise and accurate determination of Ra-228 and the radium isotope ratio (Ra-228/Ra-226) by multicollector inductively coupled plasma mass spectrometry (MC-ICPMS) in natural water. The method was tested on waters from Lake Kinneret (The Sea of Galilee) and saline springs that flow into it. The radium is pre-concentrated from 60 L of Lake Kinneret water (or 2 L of the saline springs water) by co-precipitation with MnO2. The separation of radium from the matrix elements was conducted by BioRad (R) AG50W-X8 and Sr Spec (R) resins. The instrumental limit of detection for Ra-228 and Ra-228 was 5 fg mL(-1) (0.05 ppq) or 0.1 and 30 dpm L-1, respectively, and the absolute limit of detection 0.005 fg. Internal precision of the radium isotope ratio (Ra-228/Ra-226) in Lake Kinneret for Ra-228 concentration as low as 0.10 fg L-1 (0.06 dpm L-1) was 2.8% (2 sigma) and external precision was 10% (2 sigma, n = 9). (C) 2010 Elsevier B.V. All rights reserved.
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页码：112 / 115
页数：4
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