Journal
ANALYTICAL CHEMISTRY
Volume 82, Issue 18, Pages 7713-7721Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac101558k
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Funding
- Chinese Academy of Science [KZCX2-YW-BR-13, KZCX2-YW-147, KZCX2-YW-JS106]
- National Science Foundation of China
- Ministry of Science and Technology of China
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Separation of carrier free iodine from low iodine level samples and accurate measurement of ultralow level I-129 in micrograms of iodine target are essential but a bottleneck in geological dating of terrestrial system and tracer research using naturally produced I-129. In this work, we present a carrier free method using coprecipitation of AgI with AgCl for preparing micrograms of iodine target, associated with combustion using a tube furnace for separating iodine from solid samples and anion exchange chromatography for preconcentrating iodine from a large volume of water. An accelerator mass spectrometry was used to measure ultralow level I-129 in micrograms of iodine target. The recovery of iodine in the entire separation procedure is higher than 80% and 65% for solid and water samples, respectively. One microgram iodine in the target (AgI-AgCl) can produce a stable I-127 signal for AMS measurement of I-129/I-127, and a detection limit of this method for I-129 is calculated to be 10(5) atoms. This will allow us to accurately determine I-129 in prenuclear geological samples of low iodine concentration with I-129/I-127 of 10(-12), such as loess, soil, coral, rock, sediment, and groundwater. Some samples with low iodine content have been successfully analyzed, and the lowest value of the I-129/I-127 ratio of 2 x 10(-11) was observed in 23.5 and 63.5 m loess samples collected in the Loess Plateau, China. The developed method sheds light on a wide application in earth science.
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