IOCAS-IR  > 海洋地质与环境重点实验室
Effect of signal acquisition mode on isotope ratio precision and accuracy in ICP-quadrupole-MS analysis
Wu, Zhiwei1; Guo, Wei1,2; Jin, Lanlan1; Hu, Shenghong1
2018-11-01
Source PublicationMICROCHEMICAL JOURNAL
ISSN0026-265X
Volume142Pages:251-257
Corresponding AuthorGuo, Wei(Wei.Guo@cug.edu.cn)
AbstractIsotope ratios (IRs) precision obtained on ICP-quadrupole MS (ICP-QMS) with ion counting detector (IC) is worse than that of TIMS or MC-ICP-MS with multiple faraday-cup detectors. To collect low and high ion signal (10(0)-10(9)), the IC detector operated in pulse (P), analog (A) or dual (D) acquisition mode has become widespread used in most commercial ICP-QMS instruments since 1990s. However, the analysis performance of IRs measurement by different signal acquisition modes (P, A, or D) were scarcely studied. The precision and accuracy of IRs (i.e., B-11(/10),Cd-114/110, and (208/206)pb) obtained in three modes was systematically evaluated in this paper. The internal precision (RSD) of IRs obtained in P mode gradually improved with the increasing of ion counting intensities, which was consistent with the principal of the counting statistical error (SE). However, it suddenly deteriorated on D (0.16-0.24% for B-11(/10), 0.17-0.22% for Cd-114(/110), and 0.16-0.22% for Pb-208/206) or A mode (0.13 to 0.10% for (11)(/)(10)(B), from 0.16 to 0.12% for(114/110)Cd and from 0.16 to 0.14% for (208/206)pb) with a further increase in ion counting. Meanwhile, both accuracy (relative error, RE, %) and external precision (RESD, %) of IRs were better in P mode rather than that of D and A mode. The instability of the A-P correlation (the correlation between pulse and analog signal outputs) was observed by monitoring the variation of signal tuning factor (T-f, which applied to convert the analog to pulse signal outputs). When the T-f was employed as a constant by the instrumental operating software rather than a dynamic correction value, a random error was occurred. This constant T-f value was the main source of the poor precision and accuracy for IRs measurement with A or D mode. Therefore, operating in P acquisition mode with a signal intensity range (0.7-0.9 M CPS for B-11(,) 1.0-1.2 M CPS for Cd-114 and Pb-208) was recommended to obtain the best IRs performance in ICP-QMS analysis. The proposed strategy was used to analyze (208/206)pb in geological standard reference materials (AGV-2, BCR-1, and BCR-2) and obtain prefect accuracy (< 0.13%, RE) and precision (0.04-0.07%, RESD).
KeywordIsotope ratios Detector acquisition mode Precision Accuracy ICP-QMS
DOI10.1016/j.microc.2018.07.002
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41773013] ; National Natural Science Foundation of China[41703132] ; National Key Research and Development Program of China[2016YFE0203000] ; National Key Research and Development Program of China[SQ2017YENC060029] ; National Key Research and Development Program of China[SQ2017YENC060144] ; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2018KG12] ; Fundamental Research Funds for the Central Universities, China University of Geosciences, Wuhan[G1323531885]
WOS Research AreaChemistry
WOS SubjectChemistry, Analytical
WOS IDWOS:000442708800033
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/160283
Collection海洋地质与环境重点实验室
Corresponding AuthorGuo, Wei
Affiliation1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China
2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Wu, Zhiwei,Guo, Wei,Jin, Lanlan,et al. Effect of signal acquisition mode on isotope ratio precision and accuracy in ICP-quadrupole-MS analysis[J]. MICROCHEMICAL JOURNAL,2018,142:251-257.
APA Wu, Zhiwei,Guo, Wei,Jin, Lanlan,&Hu, Shenghong.(2018).Effect of signal acquisition mode on isotope ratio precision and accuracy in ICP-quadrupole-MS analysis.MICROCHEMICAL JOURNAL,142,251-257.
MLA Wu, Zhiwei,et al."Effect of signal acquisition mode on isotope ratio precision and accuracy in ICP-quadrupole-MS analysis".MICROCHEMICAL JOURNAL 142(2018):251-257.
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