Model simulation of inflow water to the Baltic Sea based on 129I

Yi, Peng; Chen, X. G.; Bao, Dong; Qian, Ran-Ran; Aldahan, Ala; Tian, Fei; Possnert, Göran; Bryhn, Andreas C.; Gu, Ting; Hou, Xiaolin; He, Peng; Yu, Zhongbo; Wang, Biao

doi:10.1016/j.apradiso.2013.07.034

Cited by 2 publications

(1 citation statement)

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“…1,2 The natural abundance of 129 I in the hydrosphere was reported to be about 1.5×10 -12 ( 129 I/ 127 I) based on the measurement of marine sediment samples. [3][4][5] However, the 129 I/ 127 I atomic ratios have been significantly increased to more than 10 -10 due to anthropogenic input including nuclear weapons tests, spent fuel reprocessing plants and nuclear accidents, 5,6 even up to 10 -4 in the heavily contaminated area. [7][8][9][10][11] Iodine is a water-soluble and biophilic element, it mainly occurs as iodide, iodate and various organic associated forms in the nature.…”

Section: Introductionmentioning

confidence: 99%

Rapid analysis of 129I in natural water samples using accelerator mass spectrometry

Zhang¹,

Hou²

2021

At.Spectrosc.

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A rapid and simple co-precipitation method for iodine separation from natural samples was developed for determination of 129 I using accelerator mass spectrometry (AMS). The method includes three steps, i.e. decomposition of organic iodine, iodine separation and target preparation using co-precipitation, and sensitive measurement of 129 I/ 127 I ratio using AMS. The recovery of iodine was higher than 90% for most natural water samples in the decomposition step using K2S2O8. Iodine in the digested sample was then co-precipitated as AgI-AgCl-Ag2SO3-Ag2SO4 with a typical recovery of 95-98%. It was observed that addition of 0.2 mg 127 I carrier can significantly improve the measurement uncertainty of low-level 129 I samples by enhancing iodine ion current. The overall recovery of iodine in the entire procedure was higher than 80%, and a detection limit of 1.0×10 5 atoms (or 2.2×10 -17 g) for 129 I was achieved. The developed method was validated by certified reference material (IAEA-418) and five types of natural water samples in comparison with results using the conventional solvent extraction method. Analytical results showed good agreement with the reference values for all samples, confirming the reliability of the developed method. The simple operation, with no need for organic solvent and small amount of iodine carrier addition make the developed method suitable for rapid and reliable determination of low level 129 I in natural water samples.

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