激光-多接收等离子体质谱测定石笋的Mg/Ca比  

Determination of Mg/Ca Ratio of Stalagmite by Laser Multicollector Inductively Coupled Plasma Mass Spectrometry

作　　者：何学贤[1] 朱祥坤[1] 唐索寒[1] 杨淳[1] 蔡俊军[1] 李世珍[1] 李志红[1] 

机构地区：[1]国土资源部同位素地质重点实验室,中国地质科学院地质研究所,北京100037

出　　处：《质谱学报》2005年第z1期75-76,共2页Journal of Chinese Mass Spectrometry Society

基　　金：国家重点基金(40331005)和国家自然基金(40331005)资助项目

摘　　要：A method for determining Mg/Ca of stalagmite by LA-MC-ICPMS is studied. 24Mg/44Ca (Mass 22, intensity of 44Ca2+ , collected by ion counting and mass 24, intensity of 24Mg+, collected by Faraday cup) ratios were measured in replace of Mg/Ca ratios. Both diameter of laser sampling spot and laser moving increment were 20 μm. The curve of Mg/Ca vs. distance directly was obtained. The result indicates that relative Mg/Ca ratios changed from 0.5 to 2.0 in this stalagmite and it is enough to reflect environmental factors act.

关 键 词：MG/CA RATIO LA-MC-ICPMS STALAGMITE 

分 类 号：O657.63[理学—分析化学]