Measurement of isotope ratios on transient signals by MC-ICP?MS

Günther-Leopold, Ines; Wernli, B.; Kopajtic, Z.; Günther, Detlef

doi:10.1007/s00216-003-2226-1

Cited by 63 publications

(34 citation statements)

References 18 publications

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“…4f, Table 2). Several studies involving transient signal processing have shown that isotope ratios derived from rapidly rising or decreasing signals can be affected by delayed Faraday amplifier response times (e.g., [51,59,66,67]). The decreased precision of the spot analysis shown in Figure 4f might contain a contribution of this effect.…”

Section: Precision Accuracy Spatial Resolution and Materials Consummentioning

confidence: 99%

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Schuessler

Blanckenburg

2014

Spectrochimica Acta Part B: Atomic Spectroscopy

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Abstract. An analytical protocol for accurate in-situ Si stable isotope analysis has been established on a new second-generation custom-built femtosecond laser ablation system. The laser was coupled to a multicollector inductively coupled plasma mass spectrometer (fsLA-MC-ICP-MS). We investigated the influence of laser parameters such as spot size, laser focussing, energy density and repetition rate, and ICP-MS operating conditions such as ICP mass load, spectral and nonspectral matrix effects, signal intensities, and data processing on precision and accuracy of Si isotope ratios. We found that stable and reproducible ICP conditions were obtained by using He as aerosol carrier gas mixed with Ar/H2O before entering the plasma. Precise  29 Si and  30 Si values (better than ±0.23‰, 2SD) can be obtained if the area ablated is at least 50 x 50 µm; or, alternatively, for the analysis of geometric features down to the width of the laser spot (about 20 µm) if an equivalent area is covered. Larger areas can be analysed by rastering the laser beam, whereas small single spot analyses reduce the attainable precision of  30 Si to ca. ±0.6 ‰, 2SD, for <30 µm diameter spots. It was found that focussing the laser beam beneath the sample surface with energy densities between 1 and 3.8 J/cm² yields optimal analytical conditions for all materials investigated here. Using pure quartz (NIST 8546 aka. NBS-28) as measurement standard for calibration (standard-sample-bracketing) did result in accurate and precise data of international reference materials and samples covering a wide range in chemical compositions (Si single crystal IRMM-017, basaltic glasses KL2-G, BHVO-2G and BHVO-2, andesitic glass ML3B-G, rhyolitic glass ATHO-G, diopside glass JER, soda-lime glasses NIST SRM 612 and 610, San Carlos olivine). No composition-dependent matrix effect was discernible within uncertainties of the method. The method was applied to investigate the Si isotope signature of rock weathering at the micro-scale in a corestone sampled from a highly weathered roadcut profile in the tropical Highlands of Sri Lanka. The results show that secondary weathering products accumulated in cracks and grain boundaries are isotopically lighter than their unweathered plagioclase host, consistent with isotopically heavy dissolved Si found in rivers.

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Section: Precision Accuracy Spatial Resolution and Materials Consummentioning

confidence: 99%

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Schuessler

Blanckenburg

2014

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…As regards Sr, two problems persisted: the Sr-Rb separation and, more generally, the difficulty of the multi-collector to measure a transient signal, typical of ICP-MS, with high precision. With the use of MC-ICP-MS as a chromatographic detector and by coupling it with a liquid chromatograph, the first hyphenated systems dedicated to the measurement of isotopic ratios were obtained [23]. More recently, and just for the purpose of the determination of the 87 Sr/ 86 Sr isotopic ratio, an online Rb-Sr separation procedure has been tested and optimized, using ion chromatography coupled with MC-ICP-MS [24].…”

Section: Ion Chromatography Separationmentioning

confidence: 99%

Food traceability using the 87Sr/86Sr isotopic ratio mass spectrometry

Baffi

Trincherini²

2016

Eur Food Res Technol

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and ends with man. The environment-food interaction is clear, and the production of safe and quality food is an indispensable condition for human health. The globalization of the markets, in particular of food markets, means that a greater variety of food is proposed to consumers who want to know more about its geographical origin and characteristics. For this aim, food traceability is a tool of primary importance because it acts on both food safety and quality, in order to satisfy the needs of a demanding consumer, who is interested in the quality of the food he eats and in the controls about the veracity of the brands which protect it [1, 2]. The production of high-quality food is the first step to satisfying other important aspects, such as the development of a productive but sustainable agriculture and the control of marketing. Frequently, all this is delegated to the "labelling", which is incomplete by nature or easily manipulated. Only the use of a scientific method of identification and control of the geographical origin, independent of the "labelling" and therefore of the producer, enables us to answer in full important questions concerning food safety, food quality and consumer protection. In order to achieve good results in this field, a basic mandatory condition is to develop suitable "robust" analytical methods which can support modern legislative tools, aimed at guaranteeing food authenticity and origin and trying to avoid possible frauds; the latter are fuelled by the modern ease of transport and conservation of products in world markets. Numerous chemical, biological and genetic methods have been developed over time in order to verify the origin of foods [3]. In this paper, we will focus on mass spectrometry, in particular on the 87 Sr/ 86 Sr isotopic ratio measurement, in that it is a "robust" analytical technique, able to fulfil the requisites needed for traceability, both to satisfy the veracity of the geographical origin and to trace possible contaminated foods back to their origin. In particular, due Abstract Today, food traceability needs to develop suitable "robust" analytical methods, in terms of the precision and of the reliability of results, which can support modern legislative tools, aimed at guaranteeing food authenticity and origin and trying to avoid possible frauds. This review paper highlights the most recent results obtained with the use of the 87 Sr/ 86 Sr isotopic ratio technique, when applied to the traceability of the origin of different foods for human consumption, such as vegetables, beverages, dairy products, and meat and fish products. The instrumental techniques, with the relative methodologies and the quality of the final results, will be examined and commented.

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“…13 The MC-ICP-MS allows measurement of up to 9 masses within a 17% mass range simultaneously using Faraday cups. The fixed centre cup can be switched from Faraday to ion counter.…”

Section: Instrumentationmentioning

confidence: 99%

A laser ablation system for the analysis of radioactive samples using inductively coupled plasma mass spectrometry

Guillong

Heimgartner

Kopajtic

et al. 2007

J. Anal. At. Spectrom.

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This work describes the design and function of an a-box integrated laser ablation system coupled to an inductively coupled plasma mass spectrometer, designed and built at the hotlaboratory of the Paul Scherrer Institut, for the analysis of highly radioactive samples. A 266 nm Nd:YAG laser based ablation system was separated into beam generation and ablation and sample handling to avoid radiation induced defects of the hardware. The optical beam path is delivered through a window within the a-box. The focusing optics and the ablation cell suitable for handling highly radioactive samples are described in detail. The laser ablation system was coupled to a multicollector ICP-MS and evaluated by applying various laser parameters to ablate uranium dioxide reference materials. Isotope ratios were measured with a precision of 0.3% and a spatial resolution down to 10 mm. The optimized parameters were applied to spent nuclear fuel samples.

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Measurement of isotope ratios on transient signals by MC-ICP?MS

Cited by 63 publications

References 18 publications

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Food traceability using the 87Sr/86Sr isotopic ratio mass spectrometry

A laser ablation system for the analysis of radioactive samples using inductively coupled plasma mass spectrometry

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