Spatial distribution and formation of nitrate radical NO32- in Antarctic calcitic evaporates

Sato H; Tani A; Fielding AJ; Eaton SS; Eaton GR; Whitehead NE; Ikeya M

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Spatial distribution and formation of nitrate radical NO32- in Antarctic calcitic evaporates

机译：南极钙质蒸发中硝酸根自由基NO32-的空间分布和形成

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Nitrate radical NO32- in calcitic evaporate was discovered in Antarctica. The distribution and formation of nitrate radical NO32- in the calcite have been studied by pulse and continuous-wave electron spin resonance. In samples that had been annealed to destroy the NO32-, regeneration of the radical by gamma-rays or UV light indicated that the radical was formed by UV light (with wavelengths less than 340 nm) from solar rays, not by environmental radiation. The nonuniform spatial distribution of the nitrate radical, which was deduced from high ratios of local spin density to total spin density, suggests that the nitrate impurity was introduced into the calcium carbonate after carbonate grain formation. Formation of the carbonate-containing nitrate requires the presence of high amounts of nitrate and a dry climate. Formation of the nitrate radical requires sample exposure to UV light. These conditions are satisfied in the environment of Antarctica.

机译：在南极洲发现了钙蒸发中的硝酸根自由基NO32-。通过脉冲和连续波电子自旋共振研究了方解石中硝酸根自由基NO32-的分布和形成。在经过退火处理以破坏NO32-的样品中，自由基通过伽马射线或UV光的再生表明自由基是由太阳光的UV光（波长小于340 nm）形成的，而不是环境辐射形成的。由局部自旋密度与总自旋密度的高比率得出的硝酸根自由基的空间分布不均匀，表明硝酸根杂质在碳酸盐颗粒形成后被引入碳酸钙中。含碳酸盐硝酸盐的形成需要大量硝酸盐的存在和干燥的气候。硝酸根自由基的形成需要样品暴露于紫外线下。这些条件在南极洲的环境中得到满足。

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《Applied Magnetic Resonance》 |2004年第4期|共16页
作者
Sato H; Tani A; Fielding AJ; Eaton SS; Eaton GR; Whitehead NE; Ikeya M;
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正文语种 eng
中图分类电磁学、电动力学;
关键词
RELAXATION-TIMES; SPIN-RESONANCE; SPECTROMETER;

机译：放松时间;自旋共振;光谱仪;

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Spatial distribution and formation of nitrate radical NO32- in Antarctic calcitic evaporates

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