An assessment of the accuracy of stable Fe isotope ratio measurements on samples with organic and inorganic matrices by high-resolution multicollector ICP-MS

Schoenberg, Ronny; Blanckenburg, Friedhelm von

doi:10.1016/j.ijms.2004.11.025

Cited by 210 publications

(210 citation statements)

References 29 publications

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“…Ni on 58 Fe. The correction modes for the LA data are identical to the method described and tested in detail for solution ICP-MS data by Schoenberg and von Blanckenburg (2005). The analyses were performed using the standard-sample-bracketing technique and the iron reference material IRMM-014.…”

Section: Methodsmentioning

confidence: 99%

“…The isobaric interference of 54 Cr on 54 Fe is corrected using the method described in Schoenberg and von Blanckenburg (2005) Fe ratio of samples relative to the certified IRMM-014 value, even though the instrumental mass discrimination might differ between these ratios (Albarède and Beard, 2004), 2) the 57 Fe/ 56 Fe ratio of the sample differs up to 1.5‰ from IRMM-014 and 3) the ratio 54 Cr/ 52 Cr is considered to be constant, although natural mass-dependent fractionation exists (e.g. Schoenberg et al, 2008).…”

Section: Isobaric Cr Interferencementioning

confidence: 99%

“…Each sample was analysed in one to three measuring sessions within 12 months. To prove the accuracy of the LA data, Fe isotope composition of the sample materials were obtained independently by solution nebulization ICP-MS following the procedure described in Schoenberg and von Blanckenburg (2005). Forsterite, biotite, garnet and hornblende were digested in HF-HNO 3 .…”

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confidence: 99%

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Matrix-independent Fe isotope ratio determination in silicates using UV femtosecond laser ablation

2009

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UV femtosecond laser ablation coupled to MC-ICP-MS provides a promising in situ tool to investigate elemental and isotope ratios by non-matrix-matched calibration. In this study, we investigate Fe isotope composition in siliceous matrices including biotite, hornblende, garnet, fayalite and forsterite (San Carlos Olivine), and an oceanic Fe-Mn crust using the iron reference material IRMM-014 for calibration. Fe, respectively. This study adds to the observations of Horn et al. (2006) who have shown that the determination of Fe isotope ratios in various matrices including iron alloys, iron oxides and hydroxides, iron sulfide and iron carbonates can be performed with high accuracy and precision at high spatial resolution using UV femtosecond laser ablation ICP-MS. These results demonstrate that femtosecond laser ablation ICP-MS is a largely matrix-independent method, which provides a substantial advantage over commonly employed nanosecond laser ablation systems.

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Section: Methodsmentioning

confidence: 99%

Section: Isobaric Cr Interferencementioning

confidence: 99%

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confidence: 99%

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Matrix-independent Fe isotope ratio determination in silicates using UV femtosecond laser ablation

2009

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“…The calculated Fe isotope composition for bulk iron carbonate (based on estimated modal abundances of siderite and ankerite, their average Fe contents and their isotope compositions obtained by LA-ICP-MS) is -0.02‰ -this value shows no significant difference to 0.09‰ determined by solution ICP-MC and the leachates are considered representative. The Fe isotope composition of magnetite and iron carbonate were determined after chemical purification following the procedure described by Schoenberg and von Blanckenburg (2005). The obtained long-term external reproducibility of the solution ICP-MS measurements is better than ± 0.05‰ (2 SD).…”

Section: Solution Icp-msmentioning

confidence: 99%

Micro-scale tracing of Fe and Si isotope signatures in banded iron formation using femtosecond laser ablation

Steinhoefel

Horn

Blanckenburg

2009

Geochimica et Cosmochimica Acta

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130

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We have detected micrometer-scale differences in Fe and Si stable isotope ratios between coexisting minerals and between layers of banded iron formation (BIF) using an UV femtosecond laser ablation system connected to a MC-ICP-MS. In the magnetite-carbonate-chert BIF from the Archean Old Wanderer Formation in the Shurugwi Greenstone Belt (Zimbabwe), magnetite shows neither intra-nor inter-layer trends giving overall uniform  56 Fe values of ~0.9‰, but exhibits intra-crystal zonation. Bulk iron carbonates are also relatively uniform at near-zero values, however their individual  56 Fe value is highly composition-dependent: both siderite and ankerite and mixtures between both are present, and  56 Fe end member values are 0.4‰ for siderite and -0.7‰ for ankerite. The data suggest either an early diagenetic origin of magnetite and iron carbonates by the reaction of organic matter with ferric oxyhydroxides catalysed by Fe(III)-reducing bacteria; or more likely an abiotic reaction of organic carbon and Fe(III) during low-grade metamorphism. Si isotope composition of the Old Wanderer BIF also shows significant variations with  30 Si values that range between -1.0 and -2.6‰ for bulk layers. These isotope compositions suggest rapid precipitation of the silicate phases from hydrothermal-rich waters. Interestingly, Fe and Si isotope compositions of bulk layers are covariant and are interpreted as largely primary signatures. Moreover, the changes of Fe and Si isotope signatures between bulk layers directly reflect the upwelling dynamics of hydrothermal-rich water which govern the rates of Fe and Si precipitation and therefore also the development of layering. During periods of low hydrothermal activity, precipitation of only small amounts of ferric oxyhydroxide was followed by complete reduction with organic carbon during diagenesis resulting in carbonate-chert layers. During periods of intensive hydrothermal activity, precipitation rates of ferric oxyhydroxide were high, and subsequent diagenesis triggered only partial reduction, forming magnetite-carbonate-chert layers. We are confident that our micro-analytical technique is able to detect both the solute flux history into the sedimentary BIF precursor, and the BIF's diagenetic history from the comparison between coexisting minerals and their predicted fractionation factors.

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“…27,28,34 However, using very low concentration acids could increase signals. 31 In contrast to acids' matrix effects, few studies focus on their inuences on mass bias in MC-ICP-MS. 26,35 A study on Fe isotope measurement showed that HNO 3 is superior to HCl as it yielded smaller dris of instrumental mass bias with time and better signal stability in MC-ICP-MS. 35 In addition, as outlined above, mass bias for boron isotopes is greatly affected by the type of acid and its concentration. 22,26 Given that boron is a light element and experiences relatively large mass bias (>10%) in MC-ICP-MS, 23,36 investigation of inorganic acids' effects on its behavior in the plasma may provide an isotopic perspective on mass bias and matrix effects in MC-ICP-MS.…”

Section: Introductionmentioning

confidence: 99%

Matrix effects and mass bias caused by inorganic acids on boron isotope determination by multi-collector ICP-MS

Chen

Zhang

Wei

et al. 2016

J. Anal. At. Spectrom.

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The influence of inorganic acids (HCl, HNO 3 , and HF) on boron isotope measurement by using multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) has been investigated. The acid concentration is in the range of 0-0.2 M. Generally, acids can enhance B signal intensities and reduce isotopic mass bias compared to that of the same B concentration in a H 2 O matrix. The signal enhancement in each acid matrix differs slightly, while B isotopic mass bias is significantly different among them, with the highest 11 B/ 10 B ratio in the HF matrix and the lowest in the HCl matrix. In HCl and HNO 3 matrices, boron isotopic mass bias reduces when the acid concentration goes up. However, such a scenario is not observed in the HF matrix. Furthermore, the 11 B/ 10 B ratio in the HF matrix is the same as that in the H 2 O matrix within the studied acid concentration (up to 0.2 M). This implies that changes in mass bias and the B signal cannot be related to the same process in ICP-MS. We suggest that B signal enhancement in inorganic acids can mainly be attributed to Coulomb fission during aerosol transport towards plasma, while boron ion redistributions in the plasma caused by matrix element (e.g. Cl, N) ionization lead to changes in isotopic mass bias. As acids can cause considerable matrix effects and mass bias for boron, acidity match between samples and standard solutions is imperative for accurate and precise B isotope measurement by MC-ICP-MS.

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An assessment of the accuracy of stable Fe isotope ratio measurements on samples with organic and inorganic matrices by high-resolution multicollector ICP-MS

Cited by 210 publications

References 29 publications

Matrix-independent Fe isotope ratio determination in silicates using UV femtosecond laser ablation

Matrix-independent Fe isotope ratio determination in silicates using UV femtosecond laser ablation

Micro-scale tracing of Fe and Si isotope signatures in banded iron formation using femtosecond laser ablation

Matrix effects and mass bias caused by inorganic acids on boron isotope determination by multi-collector ICP-MS

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