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封面故事：气体稳定同位素质谱仪富集预浓缩-热裂解法同步测定顶空瓶中N2O气体的δ17O、δ18O和δ15N。范昌福等通过对传统细菌反硝化法关键设备和技术的改进, 综合优化了前处理方法、全自动气体预浓缩富集纯化系统和测试流程, 实现了测定数据的稳定性和重现性。这对有效示踪大气、水体、土壤和岩石中微量硝酸盐的来源和演化轨迹, 避免单一指标的多解性, 具有广泛应用前景。详见本期591-604页。本专辑介绍了中国地质科学院矿产资源研究所李延河等多个团队在同位素分析技术和地质应用研究中的最新认识和进展。(图片提供：范昌福)
Cover Story：The synchronous measurement using enrichment and pre- concentration-pyrolysis-IRMS tests the δ17O, δ18O andδ15N of N2O gas in head-space bottle. FAN Chang-fu et al. comprehensively optimized the pretreatment method, the automatic gas pre-concentration enrichment, the purification system and the analyzing process by improving the critical device and technique of traditional bacterial denitrification, thus achieving the stability and reproducibility of testing results. This method has a wide application for effectively tracing the source and the evolution of micro-nitrate in atmosphere, water, soil and rock and avoiding the multiple solution with a single index. For details see pp. 591-604 of this issue. This issue reports the latest viewpoints and progress of multiple groups including Professor LI Yan-he, Institute of Mineral Resources, Chinese Academy of Geological Sciences, in regard to isotope analysis technology and geological application research. (Photo by FAN Chang-fu)
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