Precise Determination of Trace Elements in Geological Samples by ICP-MS Using Compromise Conditions and Fine Matrix-Matching Strategy

Lin, Soulin; He, Man; Hu, Shenghong; Yuan, Honglin; Gao, Shan

doi:10.2116/analsci.16.1291

Cited by 28 publications

(13 citation statements)

References 16 publications

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“…BHVO‐2 appears to be enriched in Mo in comparison to BHVO‐1. The relative enrichment of Mo in BHVO‐2 is coherent with other literature data [ Lin et al , 2000], and although it may also be the result of contamination, additional analyses are needed to identify its origin.…”

Section: Resultssupporting

confidence: 84%

High‐precision Pb‐Sr‐Nd‐Hf isotopic characterization of USGS BHVO‐1 and BHVO‐2 reference materials

Weis

Kieffer

Maerschalk

et al. 2005

Geochem Geophys Geosyst

276

100

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[1] The recent development of multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) and increasing use of the technique have created the need for well-characterized rock standards, especially for isotopic systems where no internal fractionation correction can be applied. This paper presents a careful leaching experiment on the U.S. Geological Survey (USGS) reference materials BHVO-1 and BHVO-2 (Hawaiian basalts) and documents the evidence for contamination of the rock powders during processing. This contamination accounts for the difference in Pb isotopic ratios of BHVO-1 and BHVO-2 as well as for their lack of homogeneity both in Pb isotopic compositions and in some trace element contents.

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Section: Resultssupporting

confidence: 84%

High‐precision Pb‐Sr‐Nd‐Hf isotopic characterization of USGS BHVO‐1 and BHVO‐2 reference materials

Weis

Kieffer

Maerschalk

et al. 2005

Geochem Geophys Geosyst

276

100

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“…[Mo] in BHVO-2 from Lin et al (2000) and [Re] in BHVO-2 from Meisel and Moser (2004); c Range of δ 98/95 5Mo compositions and [Mo] in modern seawater (Siebert et al 2003), and the average seawater [Re] (Anbar et al 1992). The average δ 98/95 Mo value determined for the organic-rich mudrock (n = 16) was 0.72 ± 0.11‰ (2s), with internal uncertainties (2se) on individual measurements varying between 0.04‰ and 0.20‰ ( Figure 3A).…”

Section: Application To Geological Samplesmentioning

confidence: 99%

Quantitative Separation of Molybdenum and Rhenium from Geological Materials for Isotopic Determination by MC‐ICP‐MS

Pearce

Cohen

Parkinson

2009

Geostandard Geoanalytic Res

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We have developed a new chemical procedure for the quantitative separation of molybdenum (Mo) and rhenium (Re) from a wide variety of geological samples. A single pass anion exchange separation provided complete recovery of pure Mo and Re in a form that was ideal for subsequent isotope and abundance determination by multi‐collector inductively coupled plasma‐mass spectroscopy (MC‐ICP‐MS). An enriched 100Mo‐97Mo solution, mixed with the sample before digestion, enabled natural mass‐dependant isotopic fractionation of Mo to be determined with an external reproducibility of < 0.12‰ (δ98Mo/95Mo, 2s). Determination of the concentration of Mo and Re in the same sample was achieved by isotope dilution, with instrumental mass‐fractionation of Re being corrected by the simultaneous measurement of the 191Ir/193Ir ratio. We have applied the new procedure to a variety of samples, including seawater, basalt and organic‐rich mudrock. The procedure is ideally suited to palaeoredox studies requiring the precise determination of the Mo isotope composition and the Re/Mo ratio from the same sample.

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“…The majority of these, except for Rh, Re, Bi and In are usually unsuitable for use as internal standards in digested rock solutions due to their high natural abundances. Indium has been shown to be suitable for use as an internal standard for the REEs, the first row transition elements Sc, V, Cr, Co, Mn, Fe, Ni, Cu, Zn, Ga and Rb, Sr, Y, Zr, Nb, Mo, Sn, Cs and Ba in a variety of geological materials , Townsend 2000, Lin et al 2000. During the course of this study, we found that analytical precision for elements such as Li and high mass elements such as Ta, Bi, Th and U are indistinguishable from that of mid-mass elements (i.e., REEs) when using In as an internal standard (Figure 3).…”

Section: Internal Standardmentioning

confidence: 99%

Complete Trace Elemental Characterisation of Granitoid (USGS G‐2, GSP‐2) Reference Materials by High Resolution Inductively Coupled Plasma‐Mass Spectrometry

Pretorius

Weis

Williams

et al. 2006

Geostandard Geoanalytic Res

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The United States Geological Survey granitic and granodioritic reference materials G‐2 and GSP‐2 were decomposed in high‐pressure bombs using both HF‐HNO3 and HF‐HNO3‐HClO4 in order to evaluate the feasibility of characterising the entire suite of geologically relevant trace elements through direct analysis with a high‐resolution inductively coupled plasma‐mass spectrometer (HR‐ICP‐MS). The digested samples were diluted to the appropriate levels and analysed at low, medium and high resolution depending on the required sensitivity and potential interferences for each element. Memory effects during analysis of the high field strength elements (HFSE) were negligible when analysed using an all‐Teflon, uncooled sample introduction system and combined with adequate wash times with 4% v/v aqua regia + 0.5% v/v HF between samples. The concentration of the remaining lithophile elements was determined with a conventional, cooled, Scott‐type spray chamber using a wash solution of 1% v/v HNO3. Total procedural blanks contributed between 0.01 to 0.5% to final sample concentrations and blank subtractions were typically unnecessary. Abundances for Li, Hf, Ba, Zr, Ga, Rb, Sr, La, Ce, Th and U were systematically higher, while those for the heavy rare earth elements (HREEs), Cu and Y were systematically lower in this study compared to USGS values for G‐2 and GSP‐2. This is likely to be related to, respectively, higher recoveries from more efficient digestion of refractory phases (i.e., zircon, tourmaline), and better resolution of interferences when using a HR‐ICP‐MS. Sample digestion experiments also showed that perchloric acid digestion in high pressure bombs resulted in superior recoveries and better precision for the bulk of the trace elements analysed. The concentration of the remaining elements overlapped within uncertainty with recommended reference values and with values determined in other studies using isotope‐dilution TIMS, ICP‐MS and XRF. Concentrations for the elements Cd, Sn, Sb, Ta, Bi, Tb, Ni and Mo are also reported for G‐2 and GSP‐2 reference materials. Our study shows therefore that it is feasible to determine thirty‐nine geologically relevant trace elements accurately and directly in granitoid sample digests when using a HR‐ICP‐MS, thereby negating the need for ion exchange or isotopic spiking.

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Precise Determination of Trace Elements in Geological Samples by ICP-MS Using Compromise Conditions and Fine Matrix-Matching Strategy

Cited by 28 publications

References 16 publications

High‐precision Pb‐Sr‐Nd‐Hf isotopic characterization of USGS BHVO‐1 and BHVO‐2 reference materials

High‐precision Pb‐Sr‐Nd‐Hf isotopic characterization of USGS BHVO‐1 and BHVO‐2 reference materials

Quantitative Separation of Molybdenum and Rhenium from Geological Materials for Isotopic Determination by MC‐ICP‐MS

Complete Trace Elemental Characterisation of Granitoid (USGS G‐2, GSP‐2) Reference Materials by High Resolution Inductively Coupled Plasma‐Mass Spectrometry

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