Research Interests:
Research Interests:
Publisher Summary This chapter provides an evaluation of the nutritional and toxicological significance of different types of nuts and seeds in the human diet. Nuts and seeds are rich in essential elements, consisting of both macro... more
Publisher Summary This chapter provides an evaluation of the nutritional and toxicological significance of different types of nuts and seeds in the human diet. Nuts and seeds are rich in essential elements, consisting of both macro elements and trace elements or “micronutrients” with requirements of no more than a few milligrams per day. Nut consumption is associated with protection against bone demineralization, arterial hypertension, insulin resistance, and overall cardiovascular risk. Nuts are nevertheless referred to as the best dietary source of manganese and a good source of boron, especially for vegetarians. Sunflower seeds, and especially Brazil nuts, are rich sources of dietary selenium, though extremely high concentrations reported for Brazil nuts from some geographical areas raise overconsumption concerns. Nuts and seeds contain very low concentrations of most toxic and potentially toxic elements, such as silver, aluminum, antimony, tin, tellurium, thorium, and uranium. Relatively high arsenic, lead, and mercury concentrations reported in some studies for selected nuts and seeds are likely the result of contamination or analytical errors. Even essential elements may become harmful when their ingestion rates are excessive, resulting in adverse physiological effects. Other elements have no physiological benefits at all and are recognized as being toxic for humans.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests: Engineering, Chemistry, Mass Spectrometry, Environmental Chemistry, Medicine, and 13 moreBiological Sciences, Humans, Strontium, Isotopes, Animals, Lead, Inductively Coupled Plasma Mass Spectrometry, CHEMICAL SCIENCES, Isotope, Isotope Dilution, Analytical and Bioanalytical Chemistry, Natural Abundance, and Environmental Exposure
The analytical performance of laser ablation (LA) for the determination of Co, Fe, Cd, Ag, Mn, Cu and S in sphalerite was evaluated using double focusing sector field inductively coupled plasma mass spectrometry (ICP-SFMS). Samples were... more
The analytical performance of laser ablation (LA) for the determination of Co, Fe, Cd, Ag, Mn, Cu and S in sphalerite was evaluated using double focusing sector field inductively coupled plasma mass spectrometry (ICP-SFMS). Samples were collected from Zinkgruvan, situated in the south central Sweden. The use of Zn for internal standardisation, together with correction for FeS impurities in sphalerite,
Research Interests:
Isotope ratios and elemental concentrations were measured in aqueous solutions sampled at varying distances from sources of Fe or Zn ions. The measurements reveal fractionation of isotopes resulting from pure diffusion in solution. Our... more
Isotope ratios and elemental concentrations were measured in aqueous solutions sampled at varying distances from sources of Fe or Zn ions. The measurements reveal fractionation of isotopes resulting from pure diffusion in solution. Our data demonstrate that diffusion alone can cause changes in (56)Fe/(54)Fe and (66)Zn/(64)Zn isotope ratios in excess of -0.3 per thousand. These findings thus confirm previous suspicions that transport processes contribute to observed variations in isotopic compositions. Diffusion must therefore be considered when attempting to make inferences from isotope measurements on samples originating from aqueous systems where concentration gradients may develop.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
A single column separation and concentration/isotope ratio measurement method for Cr by ICP-MS (single and multicollector) was evaluated and optimized for geological and biological matrices. Results showδ53Cr homogeneity in different... more
A single column separation and concentration/isotope ratio measurement method for Cr by ICP-MS (single and multicollector) was evaluated and optimized for geological and biological matrices. Results showδ53Cr homogeneity in different urban soil profiles and suggest isotopically light signature for airborne Cr emitted by steelworks.
Research Interests:
Research Interests:
Research Interests:
Research Interests: Chemistry, Chromatography, Mass Spectrometry, Methylmercury, Medicine, and 15 moreSample Preparation, Clinical Chemistry, Humans, Medical Biotechnology, Animals, Clinical, Blood sampling, Background, Gas Chromatography, Clinical Sciences, Isotope Dilution, Clinical Study, Extraction Method, Signal to Noise Ratio, and Medical biochemistry and metabolomics
<p>Lichen and moss samples were collected from Russian Arctic areas (Kola Peninsula, Franz Josef Land and few other locations) in the 1990s. In 2020, <sup>137</sup>Cs was determined by HPGe gamma spectrometry from these... more
<p>Lichen and moss samples were collected from Russian Arctic areas (Kola Peninsula, Franz Josef Land and few other locations) in the 1990s. In 2020, <sup>137</sup>Cs was determined by HPGe gamma spectrometry from these samples after which isotopes of Pu and U were radiochemically separated from the samples. Mass ratios <sup>240</sup>Pu/<sup>239</sup>Pu and <sup>235</sup>U/<sup>238</sup>U were determined by ICP-MS for utilizing the characteristic isotopic fingerprints of different nuclear events. The aim of the work was to survey radioactive contamination sources in terrestrial environment in Russian Arctic regions, which have not yet been completely explored in respect to anthropogenic isotopes and their origin in the environment.</p>
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
ABSTRACT Performance characteristics of inductively coupled plasma sector field mass spectrometry (ICP-SFMS) were studied with a Pt guard electrode (GE) inserted between the torch and load coil. The importance of the optimisation... more
ABSTRACT Performance characteristics of inductively coupled plasma sector field mass spectrometry (ICP-SFMS) were studied with a Pt guard electrode (GE) inserted between the torch and load coil. The importance of the optimisation procedure and the matrix effects caused by a seawater matrix were assessed for 20 elements. Oxide and doubly charged ion formation was also investigated. Use of the GE allows a significant increase in ion transmission, by a factor of three to 20, thus resulting in improved instrumental detection limits. The improvement in sensitivity is mass dependent, with the highest gain observed for lower mass elements. Since, for the majority of analytical applications, actual detection limits depend upon blank levels rather on instrumental sensitivity, the most important factor for the determination of elements at ultra-trace levels is the degree of contamination of reagents and containers used. At the same time, significantly greater oxide formation is observed when operating the GE grounded rather than in the floating mode. For example, the BaO+/Ba+ ratio is ten to twelve times higher in the grounded mode. This calls for compromised instrumental parameters and the potential for severe spectral interferences from oxide species, which are often unresolved, even in high-resolution mode. Furthermore, non-spectral interferences from the seawater matrix appear to be more pronounced with the grounded GE, yielding a recovery of Ni of 55% compared with 93% in the floating GE mode. Hence all possible advantages and limitations of the use of the GE should be carefully considered prior to the analysis of real samples.
Research Interests:
Research Interests:
Research Interests: Chemistry, Chromatography, Adolescent, Humans, Child, and 15 moreHair, Elements, Female, Infant, Laser Ablation, Inductively Coupled Plasma Mass Spectrometry, Hydrogen Peroxide, Aged, High Resolution, Adult, Age Factors, Certified Reference Material, Environmental Exposure, Certified Reference materials, and Child preschool
Research Interests:
The ferrihydrite-backed DGT (diffusive gradients in thin films), recently developed for arsenic and phosphate measurements was, for the first time, characterized with respect to molybdate, antimonate, vanadate and tungstate determination.... more
The ferrihydrite-backed DGT (diffusive gradients in thin films), recently developed for arsenic and phosphate measurements was, for the first time, characterized with respect to molybdate, antimonate, vanadate and tungstate determination. Arsenate was included in the characterization to allow comparison with literature data and thus provide quality control of the measurements. In addition to laboratory experiments, field measurements were carried out in a natural stream in northern Sweden affected by mine drainage. It was shown that ferrihydrite-DGT is suitable for simultaneous determination of labile arsenic, molybdate, antimonate, vanadate and tungstate over a wide pH range. Diffusion coefficients were estimated using two different methods; diffusion cell and direct uptake to DGT devices in synthetic solutions. Estimations of the coefficients using the direct uptake method were performed between pH 4 and 8. The results from the two methods agreed well irrespective of pH, except for molybdate and antimonate that showed decreased values at pH 8. Adsorption of the analytes to ferrihydrite gel-discs was rapid at all pH values. However, there was a tendency toward lower adsorption affinity for antimonate compared to the other anions. 100% recovery of accumulated analytes was achieved through complete dissolution of the ferrihydrite adsorbent using 1.4 molL(-1) HNO(3) with 0.1 molL(-1) HF. From field sampling it was concluded that the opportunities for accurate antimonate and molybdate determination decrease at pH≥8.7. DGT-labile concentrations were generally lower than dissolved concentrations. Relatively lower DGT concentrations, compared to dissolved (&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.45 μm), were observed under a period when ferric oxide precipitations were detected on the DGT protective filter.
Research Interests: Chemistry, Analytical Chemistry, Inorganic Chemistry, Mass Spectrometry, Arsenic, and 15 moreComparative Study, Adsorption, Gradient, Diffusion, Laboratory experiment, Estimation, Ferrihydrite, Dissolution, Laboratory, Difusion, Diffusion Coefficient, Affinity, Arsenate, Direct Method, and Field Measurement
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests: Chemistry, Analytical Chemistry, Electrochemistry, Mass Spectrometry, Environmental Chemistry, and 15 moreEstuaries, Lead, Chemical Analysis, Inductively Coupled Plasma Mass Spectrometry, High Resolution, Estuary, Fresh water, Inductively Coupled Plasma, Coastal waters, Chrome, Analyst, Certified Reference Material, Anodic Stripping Voltammetry, Certified Reference materials, and Dilution
Research Interests: Isotope()
()
Research Interests:
Research Interests: Engineering, Materials Science, Physical Chemistry, Microstructure, Tribology, and 13 moreHydropower, Sliding wear, Polymer Composites, Composite Material, Friction, Lubricants, Solid Lubricants, X Ray Microtomography, Self-lubricating materials, Energy Dispersive X Ray Spectroscopy, Oscillating Motion, Reciprocating Motion, and Chemical Process Engineering
Research Interests: Archaeology, Geology, Geochemistry, Archaeometry, Mesolithic, and 2 moreCretaceous and Carboniferous(Cretaceous and Carboniferous)
(Cretaceous and Carboniferous)
A tandem cyclone-Scott type spray chamber configuration combined with infrared heating and a low-flow Micromist nebulizer was evaluated for the use in a ICP-SFMS sample introduction system. The system provides about a 3-fold sensitivity... more
A tandem cyclone-Scott type spray chamber configuration combined with infrared heating and a low-flow Micromist nebulizer was evaluated for the use in a ICP-SFMS sample introduction system. The system provides about a 3-fold sensitivity gain and lower oxide formation compared to the standard introduction system, although matrix-induced signal suppression is more pronounced, especially for elements with high ionization potential. The technique was evaluated by accurate analysis of riverine water reference material SLRS-3 with generally good agreement with certified and literature values. Long-term precision at a 20 µg l−1 concentration level was 0.7% RSD in low resolution and 1.6% RSD in medium resolution. Precision in the range 0.03–0.09% RSD for lead isotope ratios at 1 µg l−1 was obtained.
Research Interests:
Research Interests: Chemistry, Chromatography, Mass Spectrometry, Medicine, Humans, and 11 moreStainless Steel, Contamination, Inductively Coupled Plasma Mass Spectrometry, Trace Elements, High Resolution, Rare Earth, Disposable Equipment, Reproducibility of Results, Trace element, Sensitivity and Specificity, and Biochemistry and cell biology
Research Interests:
Research Interests: Chemistry, Analytical Chemistry, Chromatography, Medicine, Sample Preparation, and 11 moreHydrofluoric acid, Laser Ablation, Inductively Coupled Plasma Mass Spectrometry, Hydrogen Peroxide, High Resolution, AQUA REGIA, Inductively Coupled Plasma, NITRIC ACID, Certified Reference Material, Round Robin, and Certified Reference materials
The levels of approximately 70 elements were determined in different culinary nuts (hazelnuts, walnuts, almonds, bitter almonds, pecans, cashews, Brazil nuts, pistachios, pine nuts, peanuts and coconuts) and seeds (pumpkin and sunflower)... more
The levels of approximately 70 elements were determined in different culinary nuts (hazelnuts, walnuts, almonds, bitter almonds, pecans, cashews, Brazil nuts, pistachios, pine nuts, peanuts and coconuts) and seeds (pumpkin and sunflower) available on the Swedish market. The study was limited to raw, virtually unprocessed nuts and seeds (both shelled and unshelled) excluding mixed, roasted or salted products. In total, 44 products from different suppliers were analyzed, with the number of samples per nut/seed variety reflecting the availability of unprocessed products in retail outlets, varying from two for bitter almonds and pistachios to six for hazelnuts and walnuts. This selection includes samples from at least 11 different countries of origin. The optimized analytical procedure consists of microwave-assisted sample digestion using a HNO3/HF mixture, followed by multi-elemental analysis by double focusing, sector field inductively coupled plasma mass spectrometry. The analyses were accompanied by rigorous quality control measures including thorough control of potential sample contamination at all analytical stages, participation in inter-laboratory performance assessment schemes, and the analysis of certified reference materials of plant origin. Concentrations thus obtained were compared with data from product labels (where available), food composition tables and other relevant surveys, demonstrating, depending on the elements in question, close agreement as well as considerable differences.
Research Interests: Mathematics, Food Science, Nutrition, Mass Spectrometry, Environmental Monitoring, and 15 morePublic Health, Performance Assessment, Medicine, Multidisciplinary, Quality Control, NUTS, Elements, Country of Origin, Chemical Analysis, Inductively Coupled Plasma Mass Spectrometry, Seeds, Food Contamination, Environmental Pollutants, Certified Reference Material, and nut
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Abstract The migration of aluminium (Al) from aseptic laminated paperboard packages was studied by monitoring the Al content of orange juice (plain juice, no additives) filled into such packages and stored at ambient temperature (23°C)... more
Abstract The migration of aluminium (Al) from aseptic laminated paperboard packages was studied by monitoring the Al content of orange juice (plain juice, no additives) filled into such packages and stored at ambient temperature (23°C) for up to 1 year. Analytical procedure includes MW-assisted digestion of orange juice with concentrated nitric acid followed by determination of Al concentration by double-focusing sector field inductively coupled plasma mass spectrometry (ICP-SFMS). Special precautions were taken in order to reduce sample contamination at all stages of the procedure, resulting in a method detection limit of 5 μg L−1. In the concentration interval typical for orange juices reconstituted from concentrate, the combined measurement uncertainty of the method was within 10% RSD. Statistical tests performed on data sets representing the storage period from 12 h to 1 year revealed no time-dependent changes in Al concentration. Throughout all storage times, 3, 6, 9 and 12 months, the Al concentration is statistically undistinguishable from native concentration in the orange juice before filling into the packages.
Research Interests:
PurposeWorld imports of Italian sparkling wines fell by 9% in value and 5% in quantities. In view of this, the quality characterisation of these products is desirable to increase their market value and restore their global... more
PurposeWorld imports of Italian sparkling wines fell by 9% in value and 5% in quantities. In view of this, the quality characterisation of these products is desirable to increase their market value and restore their global visibility.Design/methodology/approachFor this purpose, in this paper, heavy metals (Cd, Co, Cr, Cu, Fe, Ga, Hf, Hg, Mn, Mo, Nb, Ni, Pb, Re, Sb, Sn, Ta, Th, Tl, U, W, V, Zn, Zr), rare Earth elements (REEs) (Ce, Dy, Er, Eu, Gd, Ho, La, Lu, Nd, Pr, Sm, Tb, Tm, Yb) and isotopes ratio (208Pb/206Pb, 207Pb/206Pb, 206Pb/204Pb, 208Pb/207Pb, 87Sr/86Sr) were analysed in Italian sparkling wines with Protected Designation of Origin (PDO) certification by High Resolution Inductively Coupled Plasma Mass Spectrometry (HR-ICP-MS) and MultiCollector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS). The samples were produced in the Veneto region, and they were compared to white and red wines from the same area.FindingsSparkling wines present a characteristic elemental pattern compared to white and red ones, with lower content of heavy metals and higher content in REEs. The ratio 87Sr/86Sr resulted in a powerful micro-scale geographical origins marker while Pb ratios as winemaking process one, both useful to prevent possible frauds. Multivariate data analyses, such as PCA and PLS-DA, were used to develop a model of recognition of Venetian sparkling wines.Originality/valueThe good classification of sparkling wines was achieved (95%), proving the suitable use of these analytes as markers for recognising sparkling wines and their geographical origin verification. To the best of the authors’ knowledge, this is the first study investigating heavy metals, REEs and isotopes in Venetian sparkling wine for their recognition.