摘要
为了提高海上现场调查中沉积物稀土元素质量分数测定的准确度,采用小型台式能量色散X射线荧光光谱仪(EDXRF)对一个航次取得的3类(远洋黏土、硅质软泥和钙质软泥)75个印度洋深海沉积物中稀土元素Nd和Y的质量分数进行现场测定。与实验室电感耦合等离子体质谱仪(ICP-MS)测定结果进行对比与相关性分析,建立现场测定深海沉积物中Nd和Y质量分数与15种稀土元素总质量分数的相关关系方程,以及沉积物中Nd与轻稀土总量、Y与重稀土总量的转换关系,3种类型深海沉积物稀土元素间相关关系基本可用同一线性关系表征,3种关系的相关系数都在0.96以上。采用太平洋和印度洋不同类型深海沉积物样品进行验证,通过转换关系估算出的轻、重稀土质量分数和总稀土量与实验室ICP-MS测定值基本吻合,相对偏差小于20%。结果表明,在大洋调查中小型台式EDXRF可应用于样品现场稀土元素质量分数的测定,这为调查现场及时了解大洋深海沉积物中稀土资源分布情况提供了一种重要可行测试手段。
In order to improve the accuracy of rare earth elements (REESs) contents in deep-sea sediments that measured on-board during marine geological survey, we analyzed 75 deep-sea sediment samples (mainly pelagic clay, siliceous ooze and calcareous ooze) from the Indian Ocean on-board by using the energy dispersive X-ray fluorescence spectrometer (EDXRF), and obtained the compositions of some rare earth elements. We compared results obtained by EDXRF with those obtained by inductively coupled plasma-mass spectrometry (ICP-MS) in the lab, and established a linear regression equation ( R 2 >0.99 ) between total rare earth elements and yttrium (REY) and Nd, Y contents, and we suggested that the contents of Nd and Y which determined by EDXRF on-board can be directly transformed into total amount of REY. Furthermore, the linear relationship between Nd and light rare earth elements (LREE) contents, Y and heavy rare earth elements and yttrium (HREE) contents were also established, the contents of Nd and Y determined by EDXRF can directly transformed into LREE and HREE. The proposed method has been validated by different types of deep-sea sediments from the Pacific Ocean and the Indian Ocean, calculated REY, LREE and HREE concentrations were in good agreement with those measured by ICP-MS, with the relative deviation less than 20%. Taking into account all these facts, the EDXRF method proved to be an effective tool for analyzing rare earth elements compositions in marine sediment on-board, it will provide a new technical support to investigate the spatial distribution of rare-earth resources in marine geological survey.
作者
张颖
汪虹敏
张辉
王赛
朱爱美
何连花
刘季花
李传顺
ZHANG Ying;WANG Hong-min;ZHANG Hui;WANG Sai;ZHU Ai-mei;HE Lian-hua;LIU Ji-hua;LI Chuan-shun(First Institute of Oceanography,MNR,Qingdao 266061,China;Key Laboratory of Marine Sedimentology and Environmental Geology,SOA,Qingdao 266061,China;Laboratory for Marine Geology,Pilot National Laboratory for Marine and Technology (Qingdao),Qingdao 266237,China)
出处
《海洋科学进展》
CAS
CSCD
北大核心
2019年第1期32-42,共11页
Advances in Marine Science
基金
国际海域资源调查与开发"十三五"规划之深海稀土资源勘查项目--深海稀土资源成矿特征与资源评价(DY135-R2-1-01)和深海富稀土沉积物地球化学标样研制(DY135-R2-1-03)
国家自然科学基金项目--东海外陆架磁性地层年代框架的建立及其古环境意义(41606075)
作者简介
张颖(1986-),女,山西榆次人,助理工程师,硕士,主要从事海洋地球化学方面研究.E-mail:zhangyinghj@163.com;通讯作者:刘季花(1965-),女,山西太谷人,研究员,博士,主要从事海洋沉积地球化学研究.E-mail:jihliu@fio.org.cn
