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Centro de Pesquisas Geocronologicas], e-mail: Although it does not represent any technical progress of the geochronological method using the U-Pb system in zircon it is a very useful and cheap facility. The procedure was first used for mass spectrometric analyses involving two international laboratories in Sao Paulo, Brazil and Beijing, China. It was applied to samples of three gneiss-migmatitic rocks from the Ita quarry in the Atuba Complex located between the Luis Alves and the Apiai Domain to test previous controversial hypotheses about its evolution.

The presence of important archaean and paleo proterozoic components in the complex is confirmed by analyses of zircon found in probably neo proterozoic leucosomes. Diorite intrusion also occurred during the neo proterozoic, associated with the 0.

Methods and reference materials. Magnetite Fe3O4 is a common accessory mineral in many geologic settings. Its variable geochemistry makes it a powerful petrogenetic indicator.

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Electron microprobe EMPA analyses are commonly used to examine major and minor element contents in magnetite. Current mitigation methods include correcting for LIEF mathematically, using matrix-matched reference materials, annealing material to reduce or eliminate radiation damage effects and tuning for robust plasma conditions. Reducing the depth and volume of ablation can also mitigate these problems and should contribute to the reduction vamoiro the uncertainty ceiling.

Reducing analysed volume leads to increased detection efficiency, reduced matrix-effects, eliminates LIEF, obviates ablation rate differences and reduces the likelihood of intercepting complex growth zones with depth, thereby apparently improving material homogeneity.

In combination with other strategies these improvements should be feasible on any ICP disciplinnas. However, reducing the volume of analysis reduces detected counts and requires a change of analytical approach in order to mitigate this.

Disciplihas strategies may include the use of high efficiency cell and torch technologies and the optimisation of acquisition protocols and data handling techniques such as condensing signal peaks, using log ratios and total signal vsmpiro.

Directory vampuro Open Access Journals Sweden. Eles foram divididos em dois grupos: To answer pressing new research questions about the rate and timing of abrupt climate transitions, a robust system for ultrahigh-resolution sampling of glacier ice is needed.

Here, we present a multielement method of LA-ICP-MS analysis wherein an array of chemical elements is simultaneously measured from the same ablation area.

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Although multielement techniques are commonplace for high-concentration materials, prior to the development of this method, all LA-ICP-MS analyses of glacier ice involved a single element per ablation pass or spot. Keck Laser Ice Facility at the University of Maine Climate Change Institute, has already been used to shed light on our flawed understanding of natural levels of Pb in Earth’s atmosphere. Halogens are excellent tracers of hydrothermal fluid sources and in-situ LA-ICP-MS analysis of Cl and Br in single fluid inclusions has provided fundamentally new insight into hydrothermal fluid flow and ore formation.

Expanding the analytical capabilities of fluid inclusion LA-ICP-MS analysis to include iodine would allow to discern between selective and coupled enrichment processes of Cl, Br and I, even in geologically complex samples that are inaccessible to bulk extraction techniques. We present iodine concentration data determined by LA-ICP-MS analysis of synthetic fluid inclusions, using the Sca17 scapolite reference material for external standardization Seo et al.

Iodine concentrations in Sca17 were determined using the Durango apatite standard. Four starting solutions containing I 0. For the low I concentration solutions, the synthetic inclusions were too small to detect I. Thus, given suitable standard materials and sufficient. Sedimentary provenance may be traced by ‘fingerprinting’ sediments with chemical, mineralogical or isotopic means.

Normally, each of these provenance proxies is characterised on a separate aliquot of the same sample. For example, the chemical composition of the bulk sample may be analysed discipllinas X-ray fluorescence XRF on one aliquot, framework petrography on another, heavy mineral analysis on a density separate of a third split, and zircon U-Pb vampiroo on a further density separate of the heavy mineral fraction.

The labour intensity of this procedure holds back the widespread application of multi-method provenance studies. These coordinates are subsequently passed on to the laser ablation system for isotopic and, hence, geochronological analysis. In the process of finding all disci;linas zircons in a sediment grain mount, the QEMSCAN yields the compositional and mineralogical compositions as byproducts.

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These studies reveal 1 that Rub’ Al Khali sand is predominantly derived from the Arabian Shield and not from Mesopotamia; 2 that the Disviplinas Nile is the principal source of Nile sand; and 3 that Orange River sand is carried northward by longshore drift nearly 1,km from South Africa to southern. Laser ablation-inductively coupled plasma-mass spectrometry LA-ICP-MS was used to study the spatial distribution of two metallodrugs with anticancer activities in vivo, namely the organoruthenium plecstatin-1 1 and its isosteric osmium analogue 2in liver, kidneys, muscles and tumours of treated mice bearing a CT tumour after single-dose i.

To the best of our knowledge, this is the first time that the spatial distribution of an osmium drug candidate has been investigated using LA-ICP-MS in tissues.

Preparation of MMS was carried out under an argon atmosphere to prevent oxidation of osmium-species to the volatile OsO 4. The highest metal concentrations were found in the liver, followed by kidney, lung and tumour tissues, while muscles displayed only very low quantities of the respective metal. Both metallodrugs accumulated in the cortex of the kidneys more strongly compared to the medulla. Interestingly, osmium from 2 was largely located at the periphery and tissue edges, vamipro ruthenium from 1 was observed to penetrate deeper into the organs and tumours.

Bed material coatings and the consequent agglomeration of bed material are main ash-related problems in FB-boilers. The bed agglomeration is a particular problem when combusting biofuels and waste materials. Whereas SEM-EDS together with automated image processing has proven to be a convenient method to study compositional distribution in coating layers and agglomerates, it is a relatively expensive technique and is not necessarily widely available. Elemental imaging of MRI contrast agents: Images from respective techniques are presented for two separate studies namely 1 convection enhanced delivery of a Gd nanocomplex developmental therapeutic into rat brain and 2 convection enhanced discippinas, with co-infusion of Magnevist commercial Gd contrast agent and Carboplatin chemotherapy druginto pig brain.

The LA technique was shown to be a powerful compliment to MRI not only in offering improved sensitivity, spatial resolution and signal quantitation but also in giving added value regarding the fate of administered agents Gd and Pt agents. Furthermore simultaneous measurement of Fe enabled assignment of an anomalous contrast enhancement region in rat brain to haemorrhage at disckplinas infusion site. The use of filter paper for calibration is proposed as matrix matched standards due to the similarities of this material with botanical samples, regarding to carbon concentration and dksciplinas distribution through both matrices.

In this way, parameters as analyte signal normalization with 13 C, carrier gas flow rate, laser energy, spot size, and calibration range were monitored. The calibration procedure using solution deposition on filter paper discs resulted in precision improvement when 13 C was used as IS.

Plant samples of unknown elemental composition were analyzed by the proposed LA method and good agreement were obtained with results of solution analysis.

Values ranged from 0. Overall, the use of filter paper as support for dried. Overall, the use of filter. The Lagoa Real Uranium Province located in the south-central part of the Bahia-BR, in the central portion of the San Francisco Craton, is composed of an association of Paleoproterozoic metagranitoids, alkali-gneisses, and albitites barren and mineralized. Intense action of metamorphic and metasomatic processes characterize this region. These processes culminated in the transformation of granites into gneisses, albitites and U mineralization in some albitites bodies.

In view of this information, we aimed to verify if the albite formed by metamorphism in the metagranites has the same fingerprint of the albite present in the barren albitites. The results allowed the determination of albites fingerprint, allowing the differentiation of at least two generations. The albitites have albite with minimal microchemical variation. These results show that the same event that generated the albitite’s albite interfered with the formation of the metagranite’s albite, but another event culminated with the formation of the second generation of the albite in the Juazerinho.

Laser parameters, typically wavelength, pulse width, irradiance, repetition rate, and pulse energy, are critical parameters which influence the laser ablation process and thereby influence the LA-ICP-MS signal. In recent times, femtosecond laser ablation has gained popularity owing to the reduction in fractionation related issues and improved analytical performance which can provide matrix-independent sampling.

The advantage offered by fs-LA is due to shorter pulse duration of the laser as compared to the phonon relaxation time and heat diffusion time. Hence the thermal effects are minimized in fs-LA. In this study, we have investigated the influence of laser pulse width 40 fs to 0. The recorded ICP-MS signal was correlated with total particle counts generated during laser ablation as well as particle size distribution.

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Our results show the importance of pulse width effects in the fs regime that becomes more pronounced when moving from femtosecond to picosecond and nanosecond regimes. Concerning ceramics the task has been the determination of provenance of some roman amphorae samples.

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In another project glass samples found in the royal palaces of Buda and Visegrad were analyzed. The results may be utilized both in exact dating and determination of provenance of glass artefacts of unknown origin. The study of the chemical composition of mineral phases of iron formation FFespecially of trace elements, is an important tool in the understanding vxmpiro the genesis of these rocks and the contribution of the phases in the composition of whole rock.

Low mass fraction of such elements in the mineral phases present in this rock type vampior a suitable analytical procedure. Several certified reference materials CRM were used for calibrate the equipment.

The results were satisfactory, since the curves showed good linearity coefficients, good accuracy and precision of results. The present study evaluates the use of an individual-specific transgenerational barium dual-isotope procedure and its application to salmon specimens from the Sella River Asturias, Spain. For such a purpose, the use of laser ablation inductively coupled plasma mass spectrometry LA-ICP-MS in combination with multiple linear regression for the determination of the isotopic mark in the otoliths of the specimens is presented.

In this sense, a solution in which two barium-enriched isotopes Ba and Ba were mixed at a molar ratio of ca. For comparison purposes, as well as for a time-monitoring control, egg and larva data obtained by solution analysis ICP-MS are also given. The capabilities of the molar discoplinas approach for 2D imaging of fish otoliths are also addressed.

A critical review of recent studies. Analysis of clinical specimens by imaging techniques allows to determine the content and distribution of trace elements on the surface of the examined sample. In order to obtain reliable results, the developed procedure should be based not only on the properly prepared sample and performed calibration.

It is also necessary to carry out all phases of the procedure in accordance with the principles of chemical metrology whose main pillars are the use of validated analytical methods, establishing the traceability of the measurement results and the estimation of the uncertainty.

This review paper discusses aspects related to sampling, preparation and analysis of clinical samples by laser ablation inductively coupled plasma mass spectrometry LA-ICP-MS with emphasis on metrological aspects, i. This work promotes the introduction of metrology principles for chemical measurement with emphasis to the LA-ICP-MS which is the comparative method that requires studious approach to the development of the analytical procedure in order to acquire reliable quantitative results.

Laser ablation inductively coupled plasma mass spectrometry LA-ICP-MS has been revealed as a convenient technique for trace elemental imaging in tissue sections, providing elemental 2D distribution at a quantitative level. For quantification purposes, in the last years several approaches have been proposed in the literature such as the use of CRMs or matrix matched standards. In this work, a quantification method based on ID analysis was developed by printing isotope-enriched inks onto kidney slices from rats treated with antitumoral Pt-based drugs using a commercial ink-jet device, in order to perform an elemental quantification in different areas from bio-images.

For the ID experiments Pt enriched platinum was used. The amount of Pt present in the whole kidney slices was quantified for cisplatin, carboplatin and oxaliplatin-treated rats. The results obtained were in accordance with those previously reported. The amount of Pt distributed between the medullar and cortical areas was also quantified, observing different behavior for the three drugs.

Bromine and chlorine are important halogens for fluid source identification in the Earth’s crust, but until recently we lacked routine analytical techniques to determine the concentration of these elements in situ on a micrometer scale in minerals and fluid inclusions. We assess the effects of varying spot sizes, variable plasma energy and resolve the contribution of polyatomic interferences on Br measurements.

This technique can be applied to resolve a range of hydrothermal geology problems, including determining the origins of ore forming brines and ore vampieo processes, mapping metamorphic and hydrothermal fluid provinces and pathways, and constraining the effects of fluid—rock reactions and fluid mixing.

Selenium and selenoproteins are important components of living organisms that play a role in different biological processes.