Stepwise Fluorination Method for Determination of Oxygen Isotopic Ratio of Diatoms

doi:10.3724/SP.J.1096.2012.20497

	Stepwise Fluorination Method for Determination of Oxygen Isotopic Ratio of Diatoms
	Li Tie-Jun; Li Hong-Wei; Liu Xiu-Jin; Feng Lian-Jun
刊名	CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
	2012-12-01
卷号	40 期号:12 页码:1897-1901
关键词	Isoope ratio Diatom Stepwise fluorination delta O-18 value
ISSN号	0253-3820
DOI	10.3724/SP.J.1096.2012.20497
文献子类	Article
英文摘要	Determination of the delta O-18 value of diatom can obtain the initial information of its oxygen isotopic composition, and also has favorable application prospects in paleoenvironment, paleontology, petroleum exploration and environmental prediction. We carried out eight-step fluorination experiments with BrF5 reagent on diatom samples and quartz standard to reveal variation of oxygen isotopic composition in different steps. The eight-step fluorination determined the proportion of surface oxygen to be 25%-28%. The delta O-18 values obtained from the above processes were all around (35. 34 +/- 0. 15)parts per thousand. Then we simplified the eight-step fluorination to two-step fluorination. First, we removed the surface oxygen of specific sedimentary diatoms, and then totally fluoridated the samples. The difference of delta O-18 values from eight-step and two-step fluorination experiments on the same samples was only 0. 3 parts per thousand. The accuracy of measurement has reached or preceded the repeated measurement error of +/- 0. 5 parts per thousand in the international studies. On the basis of many conditional experiments, the stepwise fluorination methods on the diatoms were established. For diatom samples with weight of a mg, the 0.392 aK mL (K=0. 18) BrF5 were loaded in the first step, and heated to 550 degrees C for 1 h; and then five times of theoretical quantity of BrF5 were loaded in the second step after the system regain vacuum, and heated to 550 degrees C for 3 h. The released oxygen were converted to CO2, and then analysed by MAT-252 to obtain delta O-18 value of diatom samples.
WOS关键词	SOUTHERN-OCEAN ; SILICA
WOS研究方向	Chemistry
语种	英语
出版者	ELSEVIER SCIENCE INC
WOS记录号	WOS:000317237500012
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84582]
专题	中国科学院地质与地球物理研究所
通讯作者	Li Tie-Jun
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Li Tie-Jun,Li Hong-Wei,Liu Xiu-Jin,et al. Stepwise Fluorination Method for Determination of Oxygen Isotopic Ratio of Diatoms[J]. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY,2012,40(12):1897-1901.
APA	Li Tie-Jun,Li Hong-Wei,Liu Xiu-Jin,&Feng Lian-Jun.(2012).Stepwise Fluorination Method for Determination of Oxygen Isotopic Ratio of Diatoms.CHINESE JOURNAL OF ANALYTICAL CHEMISTRY,40(12),1897-1901.
MLA	Li Tie-Jun,et al."Stepwise Fluorination Method for Determination of Oxygen Isotopic Ratio of Diatoms".CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 40.12(2012):1897-1901.