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Lu Chen
Northwest University (United States)
8Publications
3H-index
64Citations
Publications 8
Newest
#1Lu Chen (Northwest University (United States))H-Index: 3
#2YUANHonglin (Northwest University (United States))H-Index: 35
Last.Peng Liang (Northwest University (United States))H-Index: 3
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Abstract Sulfur isotopic composition is useful for tracing sources of ore-forming materials. In situ sulfur isotope analysis by laser ablation coupled with multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) has an advantage over traditional bulk analysis in tracing sources of sulfur in an ore deposit that has complex mineral types and multiple ore-forming processes. However, in using this method, matrix effects exist widely for sulfides from ore deposits. In this work, ma...
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#1YUANHonglin (Northwest University (United States))H-Index: 35
#2Zhian Bao (Northwest University (United States))H-Index: 8
Last.Tao Zhang (Northwest University (United States))
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In this work, we improved the sensitivity of a multi-collector-inductively coupled plasma mass spectrometry system by increasing the vacuum of the expansion chamber using a high-speed EH mechanical booster pump (EH500, 500 m3 h−1, BOC Edwards) in conjunction with a standard E2M80 pump (80 m3 h−1, BOC Edwards). The vacuum was improved from 1.0 mbar to less than 0.5 mbar. The sample ion yield for heavy isotopes, such as those of Pb, was improved from 0.047% to 0.072% in the wet-plasma mode (sample...
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#1YUANHonglin (Northwest University (United States))H-Index: 35
#2Xu Liu (Northwest University (United States))H-Index: 4
Last.Johnson Wenhong Qiu (HKU: University of Hong Kong)H-Index: 1
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Abstract We herein report the coupling of a nanosecond laser ablation system with a large-scale multi-collector inductively coupled plasma mass spectrometer (Nu1700 MC-ICPMS, NP-1700) and a conventional Nu Plasma II MC-ICPMS (NP-II) for the simultaneous laser ablation and determination of in situ S and Pb isotopic compositions of sulfide minerals. We found that the required aerosol distribution between the two spectrometers depended on the Pb content of the sample. For example, for a sulfide con...
10 CitationsSource
#1Zhian Bao (Northwest University (United States))H-Index: 8
#2Chunlei Zong (Northwest University (United States))H-Index: 6
Last.YUANHonglin (Northwest University (United States))H-Index: 35
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In this study, Pb isotope ratios in ferromanganese nodules were determined with good repeatability and minimum laboratory bias using laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). One certified ferromanganese nodule reference material, NOD-A-1, in the form of pressed powder pellets (PPPs) produced upon ultrafine processing, was homogeneous enough to be used as an in-house matrix-matched standard or quality control sample for Pb isotopic microanalysis....
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#1Chunlei Zong (Northwest University (United States))H-Index: 6
#2Zhian Bao (Northwest University (United States))H-Index: 8
Last.YUANHonglin (Northwest University (United States))H-Index: 35
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Herein, the potential of laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) for the determination of Pb isotopes of lead-glazed ceramics has been investigated. To obtain good precision and accuracy, thallium was adopted to correct mass bias during Pb isotope analyses. The average 206Pb/204Pb, 207Pb/204Pb, 208Pb/204Pb, 207Pb/206Pb, and 208Pb/206Pb ratios determined by LA-MC-ICP-MS were within 0.027% of that obtained by the solution nebulizer MC-ICP-MS (SN-M...
2 CitationsSource
#1Kaiyun Chen (Northwest University (United States))H-Index: 7
#2YUANHonglin (Northwest University (United States))H-Index: 35
Last.Lu Chen (Northwest University (United States))H-Index: 3
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Abstract Herein, we describe the use of a Nu Plasma 1700 multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) in true high-resolution mode to determine Fe isotopic ratios at the center of Fe peaks instead of their shoulders. A standard-sample bracketing (SSB) technique and a Ni doping method were used for instrumental mass bias calibration. The effects of Fe/Ni ratio and plasma mode were investigated in order to establish a high-precision Fe isotope analysis method. The resul...
3 CitationsSource
#1Zhian Bao (Northwest University (United States))H-Index: 8
#2Lu Chen (Northwest University (United States))H-Index: 3
Last.Mengning Dai (Northwest University (United States))H-Index: 5
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Controlling the accuracy and precision of sulfur and lead isotopic compositions in natural sulfide minerals requires the use of well-characterized reference materials with matrices similar to those of the unknown samples being analyzed. However, it is often a challenge to prepare natural or synthetic reference materials with homogeneous isotope compositions on a micro-scale. Herein, we report a novel method to synthesize homogeneous sulfide reference materials in the form of nano-particulate pre...
36 CitationsSource
#1Lu Chen (Northwest University (United States))H-Index: 3
#2Kaiyun Chen (Northwest University (United States))H-Index: 7
Last.YUANHonglin (Northwest University (United States))H-Index: 35
view all 6 authors...
We prepared a series of pressed powder tablets and chalcopyrite glass standards to correct mass bias when using standard–sample bracketing for in situ sulfur isotope measurements. A femtosecond laser ablation coupled multi-collector inductively coupled plasma mass spectrometry (fsLA-MC-ICP-MS) method was used to determine the sulfur isotope composition of these standards. Chalcopyrite glass (YN411-m) was prepared by quickly quenching the fused chalcopyrite, which was melted at 1000 °C under a pr...
13 CitationsSource
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