• Title, Summary, Keyword: 다검출기 유도결합 플라즈마 질량분석기

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$^{230}$ Th/$^{234}$ U disequilibrium dating of fracture-filling carbonate veins from the Ipsil and Janghangri fault zones, Gyeongju, Korea by multiple collector inductively coupled plasma mass spectrometry (다검출기 유도결합 플라즈마 질량분석기를 이용한 경주 입실, 장항리 단층 파쇄대 충진 탄산염암 맥의 $^{230}Th/^{234}U$ 비평형 연대측정)

  • 정창식;최만식;김현철;임상복
    • The Journal of the Petrological Society of Korea
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    • v.10 no.3
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    • pp.148-156
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    • 2001
  • We report $^{230}Th/^{234}U$ disequilibrium ages of fracture-filling carbonate veins from the Ipsil and Janghangri fault zones, Gyeongju, Korea by multiple collector inductively coupled plasma mass spectrometry. The U and Th fraction was extracted from totally dissolved samples by rapid and convenient coprecipitation and ion exchange chemistry. The recovery was around 80% for Th and 70% for U. The $^{234}U/^{238}U,\;^{230}Th/^{232}Th$ ratios were analysed for this preconcentrated fraction and the U/Th ratio was directly analysed for untreated sample solution. The $^{234}U-^{230}Th$ system is in secular equilibrium for the Ipsil carbonate samples, supporting previously reported ESR ages. The detrital-corrected $^{230}Th/^{234}U$ age of the Janghangri carbonate samples is $48\pm$41 ka, which constrains the minimum age of the fracture zone.

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Rapid and Precise Determination of Pb Isotope Ratios Using Mu1ti-Collector ICP/MS (다검출기 유도결합 플라즈마 질량분석기를 이용한 신속하고 정밀한 Pb 동위원소 분석)

  • 최만식;정창식;신형선;임태선
    • The Journal of the Petrological Society of Korea
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    • v.10 no.3
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    • pp.157-171
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    • 2001
  • This study investigated the effects of Pb/Tl ratio, Pb concentration and concomitant matrix elements on the measurement of Pb isotope ratios using multi-collector ICP/MS (AXIOM MC model). Accuracy and reproducibility of Pb isotope ratios in NBS 981 solution were estimated for 42 data measured from March to August 2001. Pb isotopes measured in rocks, bronzes and sediments were compared to data measured by TIMS. Reproducibilities for $^{206}Pb/^{204}Pb,\; ^{207}Pb/^{204}Pb,\;and\;^{208}Pb/^{204}Pb$ ratio were about 500 ppm (2sd) and for $^{207}Pb/^{206}Pb$\;and\;^{208}Pb/^{206}Pb$ were 100~200 ppm for 200 ng of Pb in NBS 981 solution. The optimum conditions for the analysis of Pb isotope ratios with AXIOM MC for best accuracy and reproducibility were defined as follows; 1) Pb/Tl ratio is about 10 2) Pb concentration is about 100 ng/ml 3) correction for mass discrimination is performed by exponential law using 2.3887 of $^{205}Tl/^{203}Tl$ and Pb mass fractionation factor empirically obtained from $ln(^{208}Pb/^{206}Pb)-ln(^{205}Tl/^{203}Tl)$ relationship. The sample data measured with MC/ICP/MS for acid-digested and chemically separated rock samples, and acid-digested bronze samples and sediment samples coincide with those of TIMS within analytical errors. Therefore, MC/ICP/MS is a rapid analytical technique for Pb isotope ratios with the similar precision compared with TIMS.

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Molybdenum Isotope Analysis of Standard Reference Materials (표준물질을 이용한 몰리브덴 동위원소 분석)

  • Jo, Yunsoo;Kil, Youngwoo;Ryu, Jongsik;Seol, Junghwan;Nguyen, The Cong;Jung, Woochul;Park, Sanghee
    • Economic and Environmental Geology
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    • v.49 no.2
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    • pp.89-95
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    • 2016
  • Mo isotope, one of highly redox-sensitive isotopes, has been shown to be useful tracers of geochemical processes. Many studies for Mo isotope have documented with the help of recently developed analysis tools, but it has not yet been documented in the Korea. In this study, we introduce two-stage column separation method of Mo using column tube (BioRad PolyPrep(R) column, 10 ml) and anion exchange resin (BioRad Resin AG(R) 1-X8, 200-400 mesh). Mo isotope ratios in the solid SRMs (BHVO-2, SDO-1, PACS-2) and liquid SRM (IAPSO) were measured on MC-ICP-MS (Multi-collector Inductively Coupled Plasma Mass Spectrometer) and then compared with reference Mo isotope ratios. Mo isotope ratios in our study overlap with reference Mo isotope ratios within analytical error.

Use of Magnesium Stable Isotope Signatures for the Petrogenetic Interpretation of Granitic Rocks (화강암류의 성인 해석에 대한 마그네슘 동위원소 자료의 활용)

  • Cheong, Chang-Sik;Ryu, Jong-Sik
    • The Journal of the Petrological Society of Korea
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    • v.23 no.3
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    • pp.221-227
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    • 2014
  • With the advent of multi collector-inductively coupled plasma mass spectrometry, stable isotopic variations of non-traditional metal elements have provided important constraints on the sources of geologic materials. This review introduces the principles of magnesium isotopic fractionation and analytical methods. Recent case studies are also reviewed for the use of magnesium isotope signatures to decipher the source materials of I-, S-, and A-type granitoids in western North America, Australia, and China.

Improving Strontium Isotope Ratio Analysis Using MC-ICP-MS (다검출기 유도결합 플라즈마 질량분석기를 이용한 스트론튬 동위원소비 분석법 개선)

  • Lee, Sin-Woo;Park, Jaeseon;Park, Hyun-Woo;Hwang, Jong Yeon;Kim, Kumhee;Chung, Hyun-Mi;Choi, Jong-Woo
    • Journal of The Korea Society For Environmental Analysis
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    • v.21 no.4
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    • pp.237-242
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    • 2018
  • Strontium (Sr) commonly exists in rock, groundwater, soil, plants, and animals. The Sr isotope ratio offers important information as a tracer on nature because the Sr isotopic composition is not fractionated by any biological process in these ecosystems. Hence, Sr isotope ratio has been used in several studies on tracing the Sr source for contaminated sites and human migration. In this study, we developed a separation method for Sr content, and then improved Sr isotope analysis using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). A powdered rock standard (NIST 2710a) was used to determine the removal of interference elements (Rb and Ca) and the recovery rate of Sr content. The results ranged from 98% to 106%. Additionally, three standard samples (NBS 987, IAPSO and NIST 1486) were analyzed to evaluate the precision and accuracy of the results. The measured $^{87}Sr/^{86}Sr$ ratio for all the samples were consistent with the reported values, within an error. These results indicate that our established Sr separation and Sr isotope measurement methods are reliable and can hence be useful in the fields of environmental and forensic sciences.

Copper Isotope Measurements Using a Neptune MC-ICP-MS (다검출기 유도결합 플라즈마 질량분석기를 이용한 구리 동위원소 분석법)

  • Park, Sanghee;Ryu, Jong-Sik;Shin, Hyung Seon;Kil, Youngwoo;Jo, Yunsoo
    • Journal of the Mineralogical Society of Korea
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    • v.29 no.4
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    • pp.221-227
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    • 2016
  • Copper is an essential transition metal involving in various biogeochemical processes. With the recent advances in analytical techniques and mass spectrometry, such as MC-ICP-MS, it is possible to measure Cu isotopes, which allows us to understand various biogeochemical processes in detail. Nonetheless, few studies have been performed in South Korea. In this study, we compared two purification methods previously reported using an anion exchange resin ($AG^{(R)}$ MP-1M), developed the best method in our lab environment, and then verified it by measuring Cu isotopic compositions in two USGS geological reference materials (BHVO-2 and BIR-1a). Although all matrix cations causing mass bias were effectively removed through both two methods with the yield of better than 95%, the method using the mixture of HCl and $H_2O_2$ only displays Cu isotopic compositions, in excellent agreement with reported values within the error. The method developed in this study is expected to be commonly applied to earth and environmental sciences.