·
搜索结果:找到“LA-ICP-MS”相关结果1083条
排序: 按相关 按相关 按时间降序
  • 【期刊】 Quantitative mapping of trace elements in agate using LA-ICP-MS

    刊名:Journal of Analytical Science and Technology 作者:Park, Chan-Soo ; Shin, Hyung Seon ; Yi, Keewook ; Cho, Hana ; Kim, Yoonsup 关键词:LA-ICP-MS ; Quantitative mapping ; Trace element distribution ; Agate 机构:Division of Environmental & Material Sciences, Korea Basic Science Institute, Cheongju, 363-883, Republic of Korea;Department of Earth and Environmental Sciences, Chungbuk National University, Cheongju, 362-763, Republic of Korea; ; Division of Environmental & Material Sciences, Korea Basic Science Institute, Cheongju, 363-883, Republic of Korea;Department of Earth and Environmental Sciences, Chungbuk National University, Cheongju, 362-763, Republic of Korea; 年份:2015
    摘要:Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is an optimized technique for the quantitative mapping of trace elements on geological materials. Agate is an aggregate of microcrystalline silica showing a variety of colorful bands due to the species and concentrations of transition metals and is thus an appropriate sample to test the availability, efficiency, and detection limit of LA-ICP-MS trace element mapping. Two fortification agate samples selected for elemental mapping are characterized by the colorful and bluish banding layers, respectively. The colorful agate sample consists mainly of two growth zones varying in color from pale orange-red brown to gray tones, whereas the blue agate sample simply shows alternating blue and white bands. Two different types of mineral inclusions, Fe oxide/hydroxide and hollandite (Ba(Mn4+ 6Mn3+ 2)O16), were identified in the inner and outer halves of the former sample, respectively. The distribution patterns of eight trace elements in these samples, including Al, Co, Cr, Cu, Fe, Mn, Ni, and Ti, were investigated, using both electron microprobe and LA-ICP-MS. Aluminum and Fe are the most abundant trace elements in both agate samples up to 5000 ppm although their concentrations in the colorful agate sample are an order of magnitude higher than those in the blue agate sample. The concentrations of other elements in the agate samples are several parts per million levels. The quantitative maps of the colorful agate sample have shown that Fe was mainly distributed in the inner half, but Al, Cu, and Mn in the outer half. In particular, Fe and Mn were primarily concentrated as small spots. On the other hand, the oscillatory zoning patterns are apparent in the quantitative maps of the blue agate sample, showing a correlative relationship between Al and Ti but an antithetic relationship between Al and Fe. The Al and Fe distribution patterns of the colorful agate sample are reproduced in the Al Kα and Fe Kα X-ray maps, but not clear in blue agate. Quantitative elemental maps using LA-ICP-MS are privileged to visualize trace elements distributions.
  • 【期刊】 LA-ICP-MS analysis of natural rock samples using XRF glass beads

    刊名:Geosciences Journal 作者:Kil, Youngwoo ; Jung, Haemyeong 关键词:glass bead ; rock ; LA-ICP-MS ; data quality 年份:2015
    摘要:Glass beads that remain after measuring major element compositions using XRF can also be used to measure trace element compositions using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The JA-1 and JB-3 reference glass beads were used to evaluate the homogeneity of trace elements contained within them as well as the data quality of LA-ICP-MS measurements. JA-1 has a homogenous trace element composition with less than 10% relative standard deviation, and JB-3 has an average relative standard deviation and average limit of detection of the trace elements of 4% and 0.94%, respectively. The measured and reference values of JB-3 have the highest correlation (R-2 = 0.996). Natural rock samples with intermediate to acidic compositions, such as Hwasun andesite, Mudeungsan dacite tuff, and Dogok rhyolite from Mudeungsan National Park, South Korea, are also used to evaluate the LA-ICP- MS data quality. Trace elements in these natural rock samples are plotted in a reasonable area of the geochemical discrimination diagram with sufficient precision. Accordingly, glass beads made from natural rock samples can be used to measure their trace element compositions using fast in situ and low-cost LA-ICP-MS analysis with similar data quality as achieved with normal solution ICP-MS analysis.
  • 【期刊】 Elemental and molecular imaging by LA-ICP-MS

    刊名:Analytical and Bioanalytical Chemistry 作者:Fernández, Beatriz 年份:2018
    摘要:
  • 【期刊】 Apatite Chlorine Concentration Measurements by LA-ICP-MS

    刊名:Geostandards and Geoanalytical Research 作者:Chew, David M. ; Donelick, Ray A. ; Donelick, Margaret B. ; Kamber, Balz S. ; Stock, Michael J. 关键词:apatite ; annealing ; fission track ; chlorine ; LA-ICP-MS ; recuit ; traces de fission ; apatite ; chlore ; LA-ICP-MS 年份:2014
    摘要:Apatite incorporates variable and significant amounts of halogens (mainly F and Cl) in its crystal structure, which can be used to determine the initial F and Cl concentrations of magmas. The amount of chlorine in the apatite lattice also exerts an important compositional control on the degree of fission-track annealing. Chlorine measurements in apatite have conventionally required electron probe microanalysis (EPMA). Laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) is increasingly used in apatite fission-track dating to determine U concentrations and also in simultaneous U-Pb dating and trace element measurements of apatite. Apatite Cl measurements by ICP-MS would remove the need for EPMA but the high (12.97 eV) first ionisation potential makes analysis challenging. Apatite Cl data were acquired using two analytical set-ups: a Resonetics M-50 193 nm ArF Excimer laser coupled to an Agilent 7700x quadrupole ICP-MS (using a 26 mu m spot with an 8 Hz repetition rate) and a Photon Machines Analyte Excite 193 nm ArF Excimer laser coupled to a Thermo Scientific iCAP Qc (using a 30 mu m spot with a 4 Hz repetition rate). Chlorine concentrations were determined by LA-ICP-MS (1140 analyses in total) for nineteen apatite occurrences, and there is a comprehensive EPMA Cl and F data set for 13 of the apatite samples. The apatite sample suite includes different compositions representative of the range likely to be encountered in natural apatites, along with extreme variants including two end-member chlorapatites. Between twenty-six and thirty-nine isotopes were determined in each apatite sample corresponding to a typical analytical protocol for integrated apatite fission track (U and Cl contents) and U-Pb dating, along with REE and trace element measurements. Cl-35 backgrounds (present mainly in the argon gas) were ~ 45-65 kcps in the first set-up and ~ 4 kcps in the second set-up. Cl-35 background-corrected signals ranged from ~ 0 cps in end-member fluorapatite to up to ~ 90 kcps in end-member chlorapatite. Use of a collision cell in both analytical set-ups decreased the low mass sensitivity by approximately an order of magnitude without improving the Cl-35 signal-to-background ratio. A minor Ca isotope was used as the internal standard to correct for drift in instrument sensitivity and variations in ablation volume during sessions. The Cl-35/Ca-43 values for each apatite (10-20 analyses each) when plotted against the EPMA Cl concentrations yield excellently constrained calibration relationships, demonstrating the suitability of the analytical protocol and that routine apatite Cl measurements by ICP-MS are achievable.
  • 【期刊】 Statistics for LA-ICP-MS based fission track dating

    刊名:Chemical Geology 作者:Vermeesch ; Pieter 年份:2017
    摘要:
  • 【期刊】 Validation of depth-profiling LA-ICP-MS in otolith applications

    刊名:Canadian Journal of Fisheries and Aquatic Sciences 作者:Warburton, Manna ; Reid, Malcolm ; Stirling, Claudine H ; Closs, Gerard P. 年份:2016
    摘要:
  • 【期刊】 Skip the beat: minimizing aliasing error in LA-ICP-MS measurements

    刊名:Analytical and Bioanalytical Chemistry 作者:Hattendorf Bodo ; Hartfelder Urs ; Günther Detlef 年份:2018
    摘要:
  • 【期刊】 Sourcing obsidian: a new optimized LA-ICP-MS protocol

    刊名:STAR: Science & Technology of Archaeological Research 作者:Orange, Marie ; Le Bourdonnec, Fran?ois-Xavier ; Scheffers, Anja ; Joannes-Boyau, Renaud 年份:2016
    摘要:
上一页 1 2 3 4 5 6 7 8 9 10 下一页 跳转