黄土中宇宙成因核素^10Be提取条件检验  

Optimizing experimental conditions of extraction cosmogenic nuclide ^(10)Be in loess

作　　者：赵国庆[1,2] 张丽[1,2] 孔祥辉[1,2] 付云翀[1,2] 杜雅娟[1,2] 

机构地区：[1]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西省加速器质谱技术及应用重点实验室,西安710061 [2]西安加速器质谱中心,西安710061

出　　处：《地球环境学报》2017年第2期169-175,共7页Journal of Earth Environment

基　　金：国家自然科学基金项目(41230525,11205161)~~

摘　　要：鉴于利用中国黄土中的宇宙成因核素^(10)Be示踪高分辨率的古地磁场变化研究工作需要高精度、低本底的化学实验结果,为获得现有样品制备流程的详细数据并优化实验流程,文章对酸提取效率进行了检验。通过采用不同温度、不同酸度在加热板和微波消解仪下的提取效率对比检验,获得了不同条件下的可靠实验数据,检验了现有流程提取两次可将样品中90%以上的^(10)Be提取出来,达到实验要求。Background, aim, and scope High precision and low background contimination are required in the research work of cosmogenic nuclide beryllium 10 to trace high precision geomagnetic change in Chinese loess. Wu et al （2008） have optimized and established a reliable experimental process for the preparation of BeO. In order to obtain the detail data of acid extraction steps in the experimental process used now, this paper discusses the efficiency of the acid extraction. Materials and methods The experimental process used now extracts beryllium 10 from samples using 6 mol·L^-1 HCl soak overnight twice, then using deionized water to wash the sample again. This paper design 5 different conditions of the experiment to test the efficiency of the acid extraction. （1） Using 6 mol·L^-1 HCl extract samples three times then digest it using HF/HNO3/HClO4 to test the experimental extraction efficiency of beryllium 10. （2） Using 6 mol·L^-1 HCl to extract samples four times to test the experimental extraction efficiency, the results can crosscheck the results of experiment of using acid extract the sample three times and digest it. （3） Acid extraction steps in the experimental process used now under different temperature （50℃ and 70h2 ） to test the influence of temperature. （4） Acid extraction steps in the experiment process used now under different concentration of hydrochloric acid （1 mol·L^-1, 2 mol·L^-1, 4 mol·L^-1, 6 mol·L^-1 and 8 mol·L^-1） to test the influence of different concentration of hydrochloric acid. （5） Using microwave digestion instrument to test the results of different concentration of hydrochloric acid （4 mol·L^-1, 6 mol·L^-1, 8 mol·L^-1, 10 mol·L^-1 and 12 mol·L^-1） extraction. The experimental process in accordance with the Wu et al established in 2008, the measurement in Xi＇an Accelerator Mass Spectrometry Center. Results （1） The results of using hydrochloric acid extract samples three times and then digest it show that using 6 mol·L^-1 HCl extract sa

关 键 词：黄土 ^10BE BEO 

分 类 号：P318.44[天文地球—固体地球物理学]