Effect of signal acquisition mode on isotope ratio precision and accuracy in ICP-quadrupole-MS analysis
Effect of signal acquisition mode on isotope ratio precision and accuracy in ICP-quadrupole-MS analysis
复制标题
信号采集模式对 ICP-四极杆 MS 分析中同位素比精度和准确度的影响
DOI：
10.1016/j.microc.2018.07.002
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发表时间：
2018-11
影响因子：
4.8
通讯作者：
Hu Shenghong
中科院分区：
文献类型：
--
作者：
Wu Zhiwei;Guo Wei;Jin Lanlan;Hu Shenghong
Isotope 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 (100–109), 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, orD) were scarcely studied. The precision and accuracy of IRs (i.e.,11/10B,114/110Cd, and208/206Pb) obtained in three modes was systematically evaluated in this paper. The internal precision (RSD) of IRs obtained inPmode 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 onD(0.16–0.24% for11/10B, 0.17–0.22% for114/110Cd, and 0.16–0.22% for208/206Pb) orAmode (0.13 to 0.10% for11/10B, from 0.16 to 0.12% for114/110Cd and from 0.16 to 0.14% for208/206Pb) with a further increase in ion counting. Meanwhile, both accuracy (relative error, RE, %) and external precision (RESD, %) of IRs were better inPmode rather than that ofDandAmode. The instability of theA-Pcorrelation (the correlation between pulse and analog signal outputs) was observed by monitoring the variation of signal tuning factor (Tf, which applied to convert the analog to pulse signal outputs). When the Tfwas employed as a constant by the instrumental operating software rather than a dynamic correction value, a random error was occurred. This constant Tfvalue was the main source of the poor precision and accuracy for IRs measurement withAorDmode. Therefore, operating inPacquisition mode with a signal intensity range (0.7–0.9 M CPS for11B, 1.0–1.2 M CPS for114Cd and208Pb) was recommended to obtain the best IRs performance in ICP-QMS analysis. The proposed strategy was used to analyze208/206Pb 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).
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影响因子：
3.4
作者：
A. Sjögren;P. Appelblad;A. Tovedal;H. Ramebäck
通讯作者：
A. Sjögren;P. Appelblad;A. Tovedal;H. Ramebäck
影响因子：
1.6
作者：
M. Kristo;C. Enke
通讯作者：
M. Kristo;C. Enke
DOI：
10.6028/jres.093.120
发表时间：
1988-06-01
影响因子：
--
作者：
Crews HM;Massey RC;McWeeny DJ;Dean JR;Ebdon L
通讯作者：
Ebdon L
影响因子：
3.4
作者：
A. Menegário;M. Giné;J. Bendassolli;A. Bellato;P. Trivelin
通讯作者：
A. Menegário;M. Giné;J. Bendassolli;A. Bellato;P. Trivelin
影响因子：
3.5
作者：
R. Hutton;A. Eaton;Raymond M. Gosland
通讯作者：
R. Hutton;A. Eaton;Raymond M. Gosland