利用臭氧反应测量天然水中的痕量 129I，有效分离光谱干扰

IF 4.6 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

iScience Pub Date : 2024-10-21 DOI:10.1016/j.isci.2024.111138

Yanbei Zhu , Daiki Asakawa

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引用次数: 0

摘要

如果能有效消除 129Xe 和 127I1H2 的光谱干扰，串联四极杆电感耦合等离子体质谱法就有可能测量极低浓度的 129I。由于引入了臭氧作为反应气体，(129I+→129I16O+) 和 (129I+→129I16O2+) 的反应明显改善，从而可以高灵敏度地测量 129I+ 即 129I16O+ 和 129I16O2+，有助于消除与 129Xe+ 和 127I1H2+ 有关的光谱干扰。在同位素比值（129I/127I）分析中，通过测量（129I+→129I16O2+）/（127I+→127I16O2+），500 μg/mL 天然碘溶液的空白比值可达到 6.7 × 10-10，比之前报道的最佳性能提高了一个数量级。该技术有助于测量痕量 129I，129I 是一种碘放射性核素，作为与核能开发和民用有关的地球化学示踪剂以及世界卫生组织规定的饮用水指导水平的受管制放射性核素而备受关注。

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Measurement of trace 129I in natural water with ozone reaction for effective separation of spectral interferences

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Measurement of trace 129I in natural water with ozone reaction for effective separation of spectral interferences

Tandem quadrupole inductively coupled plasma mass spectrometry has the potential capability to measure ¹²⁹I at extremely low concentration if spectral interferences from ¹²⁹Xe and ¹²⁷I¹H₂ can be eliminated effectively. Ozone was introduced as the reaction gas, resulting significantly improved reactions of (¹²⁹I⁺→¹²⁹I¹⁶O⁺) and (¹²⁹I⁺→¹²⁹I¹⁶O₂⁺), and permitted the highly sensitive measurement of ¹²⁹I⁺ as ¹²⁹I¹⁶O⁺ and ¹²⁹I¹⁶O₂⁺, helping eliminate spectral interferences related to ¹²⁹Xe⁺ and ¹²⁷I¹H₂⁺. In isotopic ratio (¹²⁹I/¹²⁷I) analysis by measuring (¹²⁹I⁺→¹²⁹I¹⁶O₂⁺)/(¹²⁷I⁺→¹²⁷I¹⁶O₂⁺), a blank ratio of 6.7 × 10⁻¹⁰ can be realized for a solution of 500 μg/mL natural iodine, improved by one order of magnitude than the best performance previous reported. This technique contributes to the measurement of trace level ¹²⁹I, a radionuclide of iodine attracting attentions as a geochemical tracer related to the development and civilian use of nuclear energy as well as a regulated radionuclide with guidance levels in drinking water established by the World Health Organization.

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来源期刊

iScience Multidisciplinary-Multidisciplinary

CiteScore

7.20

自引率

1.70%

发文量

1972

审稿时长

6 weeks

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