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| 镉同位素及其环境示踪 |
| Cadmium Isotopes and Environmental Tracing |
| 投稿时间：2014-12-23 修订日期：2015-04-25 |
| DOI：10.14050/j.cnki.1672-9250.2015.06.013 |
| 中文关键词: 镉同位素;分馏;地球化学;环境示踪 |
| 英文关键词: Cd isotope;fractionation mechanism;geochemistry;environmental tracing |
| 基金项目:国家重点基础研究发展计划项目(2014CB238903);国家自然基金项目(41503121,40973082)。 |
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| 中文摘要: |
| 随着多道接收电感耦合等离子体质谱仪(MC-ICPMS)的发展和广泛应用,镉(Cd)稳定同位素已成为当前非传统同位素地球化学的研究热点之一。本文对Cd同位素的分析方法、组成特征、变化规律、分馏机制及环境应用等问题进行了系统评述。总体来说,地球样品的Cd同位素组成(δ114/110Cd)分馏较小(-2.47‰~+3.17‰),陨石等地外物质同位素分馏较大(-9.07‰~+16.13‰),已发现的分馏过程包括蒸发/冷凝过程、吸附沉淀/溶解过程、生物吸收过程。同时,Cd同位素作为一种全新的地球化学指标,可指示物源、天体演化、海洋初级生产力及营养物质循环、全球碳循环等过程;有效示踪环境介质与生物体中Cd的污染来源,为环境科学的研究提供新的视角和信息。 |
| 英文摘要: |
| In the recent years, cadmium (Cd) isotope has been one of the hot issues in the research area of non-traditional isotopes, with the developing and application of multi-collector inductivity coupled plasma mass spectrometry (MC-ICPMS). This paper systematically discussed the analysis method, composition, variation, mechanism of fractionation and the application of Cd isotope. Generally, the terrestrial materials exists small variation of Cd isotope, δ114/110Cd ranges from -2.47‰ to +3.17‰, but the extraterrestrial materials, meteorolite for example, display significant isotope fractionation effects, and δ114/110Cd ranges from -9.07‰ to +16.13‰. The process of evaporation/condensation, precipitation and biological uptake will lead to Cd isotope fractionation. Summarized the previous publications, it could be concluded that, as a new tool of geochemistry, cadmium isotope could indicate the source materials, cosmogony, primary production and nutrient cycle of ocean, and global carbon cycles. Cadmium isotope also could effectively discriminate the Cd sources of environmental medium and organism, providing new insight and information for the study of environmental sciences. |
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