Substantial peak size effect on compound-specific delta D values analyzed on isotope ratio mass spectrometry

doi:10.1016/j.chemgeo.2022.120721

	Substantial peak size effect on compound-specific delta D values analyzed on isotope ratio mass spectrometry
	Liu, Hu 3,4,5; Cao, Yunning 4,5; Hu, Jing 4,5; Liu, Zhonghui 2,5; Liu, Weiguo 1,4,5
刊名	CHEMICAL GEOLOGY
	2022-02-20
卷号	590 页码:7
关键词	Hydrogen isotopes N-Alkanes Fatty acids Isotope ratio mass spectrometry
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2022.120721
通讯作者	Liu, Weiguo(liuwg@loess.llqg.ac.cn)
英文摘要	Lipid compound-specific hydrogen isotopes (delta D) have been widely applied in studies of biogeochemistry and paleoclimatology. delta D values of lipid homologues with different chain lengths from a single analysis are often utilized together in order to make full use of the delta D information. However, this approach could be potentially impacted by the large analytical error due to the inappropriate amount injected for some homologues. Here, we systematically investigate compound-specific delta D deviations with varying contents injected on the isotope ratio mass spectrometry, expressed as amplitudes, using both lab working standards and natural samples. The n-alkane delta D values of lab working standards (mixed C-21, C-25, C-27, C-29, C-31, and C-33) could vary by 40 parts per thousand to 70 parts per thousand when the amplitudes of n-alkanes change from 0.5 V to 10 V. For natural samples (27 n-alkane and 77 fatty acid samples), we have made repeated analyses of the same samples with different homologues targeted for the optimum range. The measured delta D values are higher by 20 parts per thousand to 40 parts per thousand with the amplitudes lower than the optimum range, and lower by 10 parts per thousand to 20 parts per thousand with higher amplitudes. All the results consistently show higher delta D values with decreasing amplitudes, and larger deviations occurring in low amplitude range, implying that special caution should be taken with the delta D values measured at low amplitude range. We have attempted amplitude-based correction of lipid delta D values, however, this approach should be cautious owing to their large residual errors. Hence, delta D values of different homologues in the same samples have to be measured in separate analysis if they could not fall within the optimum range at the same time.
资助项目	National Natural Science Foundation of China[42103018] ; National Natural Science Foundation of China[41573005] ; National Natural Science Foundation of China[41873008] ; National Basic Research Programme of China[2013CB955901] ; Key Programme of the Chinese Academy of Sciences[QYZDY-SSW-DQC001] ; Technology Development and Innovation Programme of Chinese Academy of Sciences[2022g111] ; State Key Laboratory of Loess and Quaternary Geology[SKLLQG1632]
WOS关键词	N-ALKANE DISTRIBUTIONS ; PLANT LEAF WAXES ; LIPID BIOMARKERS ; TERRESTRIAL PLANTS ; SUBMERGED PLANTS ; FATTY-ACIDS ; D/H RATIOS ; HYDROGEN ; SEDIMENTS ; VARIABILITY
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000768009700012
资助机构	National Natural Science Foundation of China ; National Basic Research Programme of China ; Key Programme of the Chinese Academy of Sciences ; Technology Development and Innovation Programme of Chinese Academy of Sciences ; State Key Laboratory of Loess and Quaternary Geology
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/17589]
专题	地球环境研究所_现代环境研究室
通讯作者	Liu, Weiguo
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China 3.Xian Inst Innovat Earth Environm Res, Xian 710061, Peoples R China 4.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 5.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Liu, Hu,Cao, Yunning,Hu, Jing,et al. Substantial peak size effect on compound-specific delta D values analyzed on isotope ratio mass spectrometry[J]. CHEMICAL GEOLOGY,2022,590:7.
APA	Liu, Hu,Cao, Yunning,Hu, Jing,Liu, Zhonghui,&Liu, Weiguo.(2022).Substantial peak size effect on compound-specific delta D values analyzed on isotope ratio mass spectrometry.CHEMICAL GEOLOGY,590,7.
MLA	Liu, Hu,et al."Substantial peak size effect on compound-specific delta D values analyzed on isotope ratio mass spectrometry".CHEMICAL GEOLOGY 590(2022):7.