| 在最新分析结果基础上对碘克拉克值的修正 |
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| 引用本文： | 郑宝山,张杰.在最新分析结果基础上对碘克拉克值的修正[J].地球化学,1997,26(6):8-17. |
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| 作者姓名： | 郑宝山 张杰 |
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| 作者单位： | 中国科学院地球化学研究所!贵阳，550002，中国科学院地球化学研究所!贵阳，550002，中国科学院地球化学研究所!贵阳，550002 |
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| 摘 要： | 岩石中低含量碘的测定是分析化学的一大难题。过去由于使用的分析方法灵敏度不够，岩浆岩碘含量的测定结果偏高，以此为基础计算出来的克拉克值也偏高。放射化学中子活化（RNAA）和同位素稀释质谱（IDMS）分析法可以对岩石中ng／g级碘进行精确测定，在80年代后期克服了一些技术上的难题后，得到了一批可靠的岩石碘含量分析结果。根据最新分析结果计算出岩浆岩、沉积岩和变质岩碘的平均含量分别为18．8、724、166.9（ng／s）。以此为基础计算碘的克拉克值为115ng／g。这一结果只相当于文献值的1／3－1／10。
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| 关 键 词： | 碘 克拉克值 修正 分析结果 |
CORRECTION OF I CLARKE BASED ON LATEST ANALYTICAL DATA |
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| Zheng Baoshan, Zhang Jie, Yu Xiaoying.CORRECTION OF I CLARKE BASED ON LATEST ANALYTICAL DATA[J].Geochimica,1997,26(6):8-17. |
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| Authors: | Zheng Baoshan Zhang Jie Yu Xiaoying |
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| Abstract: | The determination of low abundance of I in rocks is difficult in analytical chemistry.The determined I abundance in magmatite was higher than what it should be, because of low sensitivity of the analytical method used before, and the I clarke calculated from the determined I abundance was also higher than what it should be.Radiochemical neutron petivation, analysis (RNAA) and isotope dilution mass spectrometry (IDMS) can accurately determine I abundance in rocks. in magnitude order of ng/g. Having surmounted a lot of technical difficulties in late 1980s, many reliable I abundance date in rocks are obtained. The average I contents for magmatite,sedimentary rock and metamorphous rock are 18-8, 724 and 166.9 ng / g. .respectively,calculated from the latest analytical results. Therefore, the I clark should be 115ng/ g based on the above I contents. This I clarke is from one-third to 1-tenth those of the literatures. |
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| Keywords: | iondine clark correction |
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