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Malinovskiy, Dmitry
Publications (10 of 30) Show all publications
Malinovskiy, D. & Kashulin, N. A. (2016). Vanadium isotope ratio measurements in fruit-bodies of Amanita muscaria. Analytical Methods, 8(30), 5921-5929
Open this publication in new window or tab >>Vanadium isotope ratio measurements in fruit-bodies of Amanita muscaria
2016 (English)In: Analytical Methods, ISSN 1759-9660, E-ISSN 1759-9679, Vol. 8, no 30, p. 5921-5929Article in journal (Refereed) Published
Abstract [en]

A new method has been developed for precise vanadium isotope ratio measurements by multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) in Amanita muscaria - a widespread toxic and hallucinogenic mushroom which is also known for its ability to bio-accumulate vanadium. Prior to isotope ratio measurements vanadium was separated from the sample matrix by anion-exchange chromatography with a single run of a sample solution through the anion-exchange column sufficient for the purification of vanadium. V-51/V-50 isotope ratio measurements were carried out in the high resolution mode of MC-ICPMS which allowed the separation of V-50(+) and V-51(+) ions from polyatomic interfering species, including sulphur-based ions. Iron was employed as an admixed internal standard and was found effective in correcting for the drift of instrumental mass bias. An important feature of the method was the use of a regression model in data reduction. The Plackett-Burman factorial design was used for ruggedness testing and showed that normalisation to the Fe-56/Fe-54 isotope ratio of the internal standard significantly improved the repeatability of the results. The combined standard uncertainties of delta V-51 values determined for samples of the mushroom ranged from 0.28 parts per thousand to 0.42 parts per thousand. delta V-51 values for the samples collected in geographically different locations varied from -0.7 parts per thousand to 1.7 parts per thousand, suggesting V-51/V-50 isotope ratio measurements as a useful tool for identifying the origin of Amanita muscaria in tasks concerned with counteracting the abuse of hallucinogenic mushrooms and in studies on the biochemistry of vanadium.

National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
urn:nbn:se:ltu:diva-59808 (URN)10.1039/c6ay01436d (DOI)000381415300005 ()2-s2.0-84980335290 (Scopus ID)
Note

Validerad; 2016; Nivå 2; 2016-10-18 (andbra)

Available from: 2016-10-18 Created: 2016-10-18 Last updated: 2018-07-10Bibliographically approved
Malinovskiy, D., Rodushkin, I. & Öhlander, B. (2007). Determination of the isotopic composition of molybdenum in the bottom sediments of freshwater basins (ed.). Geochemistry International, 45(4), 381-389
Open this publication in new window or tab >>Determination of the isotopic composition of molybdenum in the bottom sediments of freshwater basins
2007 (English)In: Geochemistry International, ISSN 0016-7029, E-ISSN 1556-1968, Vol. 45, no 4, p. 381-389Article in journal (Refereed) Published
Abstract [en]

This paper presents the results of measurements of the Mo isotopic composition in the bottom sediments (BS) of freshwater basins. Mo isotopic ratios were measured using a multicollector inductively coupled plasma mass spectrometer (MC ICP MS). Efficient methods were used in this study for Mo separation from the elements of the sample matrix and correction for instrumental mass discrimination. This allowed us to achieve a high accuracy of 0.06, 0.08, and 0.14‰ (2 σ) for the measurement of 97Mo/95Mo, 98Mo/95Mo, and 100Mo/95Mo, respectively. The range of variations in Mo isotope ratios observed in the collected BS columns was ∼2.2‰ in terms of δ97Mo/95Mo. The results obtained here suggest that geochemical processes occurring during Mo migration with land water can change the isotopic composition of Mo. It is pointed out that the potential use of Mo isotopic systematics for reconstructions of redox conditions in seawater over the geologic past requires the quantification of isotopic effects of Mo accompanying its migration on land and the extent of possible variations in the isotopic composition of Mo entering the ocean.

National Category
Bioprocess Technology Geochemistry
Research subject
Biochemical Process Engineering; Applied Geology
Identifiers
urn:nbn:se:ltu:diva-15240 (URN)10.1134/S0016702907040052 (DOI)000246353700005 ()2-s2.0-34248550752 (Scopus ID)ebcc3e70-0600-11dc-b09b-000ea68e967b (Local ID)ebcc3e70-0600-11dc-b09b-000ea68e967b (Archive number)ebcc3e70-0600-11dc-b09b-000ea68e967b (OAI)
Note
Validerad; 2007; Bibliografisk uppgift: Original Russian Text © D.N. Malinovskii, I.V. Rodyushkin, V. Ohlander, 2007, published in Geokhimiya, 2007, No. 4, pp. 429-438.; 20070519 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ingri, J., Rodushkin, I., Malinovskiy, D., Hålenius, U., Baxter, D. & Andersson, P. (2007). Fractionation of iron isotopes in shallow-marine ferromanganese concretions (ed.). Paper presented at Annual V.M. Goldschmidt Conference : 19/08/2007 - 24/08/2007. Geochimica et Cosmochimica Acta, 71(15S), A428
Open this publication in new window or tab >>Fractionation of iron isotopes in shallow-marine ferromanganese concretions
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2007 (English)In: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 71, no 15S, p. A428-Article in journal, Meeting abstract (Other academic) Published
National Category
Geochemistry Bioprocess Technology
Research subject
Applied Geology; Biochemical Process Engineering
Identifiers
urn:nbn:se:ltu:diva-35949 (URN)aaff86d0-9918-11dc-8ccb-000ea68e967b (Local ID)aaff86d0-9918-11dc-8ccb-000ea68e967b (Archive number)aaff86d0-9918-11dc-8ccb-000ea68e967b (OAI)
Conference
Annual V.M. Goldschmidt Conference : 19/08/2007 - 24/08/2007
Note

Godkänd; 2007; 20110704 (andbra)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2023-05-08Bibliographically approved
Malinovskiy, D., Baxter, D. & Rodushkin, I. (2007). Ion-specific isotopic fractionation of molybdenum during diffusion in aqueous solutions (ed.). Environmental Science and Technology, 41(5), 1596-1600
Open this publication in new window or tab >>Ion-specific isotopic fractionation of molybdenum during diffusion in aqueous solutions
2007 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 41, no 5, p. 1596-1600Article in journal (Refereed) Published
Abstract [en]

Experiments modeling diffusion of Mo in aqueous solutions have been performed and, using multicollector ICP-MS, the ratios of the diffusivities of Mo isotopes, D97Mo/D95Mo, in aqueous solutions have been determined. Diffusion of MoO42- ions in solution was concomitant with Mo isotopic fractionation with D97Mo/D95Mo = 0.99988 ± 0.00004 (2σ for n = 3). In contrast, during diffusion of Mo polyanions, such as Mo7O246- and Mo8O264-, no measurable isotope fractionation has been found with D97Mo/D95Mo = 1.00000 ± 0.00002 (2σ for n = 3). These results indicate the need for due consideration to Mo speciation when attempting to interpret the role of diffusive fluxes in the formation of Mo isotopic signatures in nature. They also raise the possibility that the various chemical forms of other transition metals may be characterized by species-specific isotopic fractionation effects during physicochemical reactions.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-4846 (URN)10.1021/es062000q (DOI)000244467500024 ()17396647 (PubMedID)2-s2.0-33847669208 (Scopus ID)2d7985a0-d31e-11db-b6e3-000ea68e967b (Local ID)2d7985a0-d31e-11db-b6e3-000ea68e967b (Archive number)2d7985a0-d31e-11db-b6e3-000ea68e967b (OAI)
Note
Validerad; 2007; 20070125 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2021-12-13Bibliographically approved
Malinovskiy, D., Hammarlund, D., Ilyashuk, B., Martinsson, O. & Gelting, J. (2007). Variations in the isotopic composition of molybdenum in freshwater lake systems (ed.). Chemical Geology, 236(3-4), 181-198
Open this publication in new window or tab >>Variations in the isotopic composition of molybdenum in freshwater lake systems
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2007 (English)In: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 236, no 3-4, p. 181-198Article in journal (Refereed) Published
Abstract [en]

Variations in molybdenum isotopic composition, spanning the range of ≈ 2.3‰ in the terms of 97Mo/95Mo ratio, have been measured in sediment cores from three lakes in northern Sweden and north-western Russia. These variations have been produced by both isotopically variable input of Mo into the lakes due to Mo isotopic heterogeneity of bedrock in the drainage basins and fractionation in the lake systems due to temporal variations in limnological conditions. Mo isotope abundances of bedrock in the lake drainage basins have been documented by analysis of Mo isotope ratios of a suite of molybdenite occurrences collected in the studied area and of detrital fractions of the lake sediment cores. The median δ97Mo value of the investigated molybdenites is 0.26‰ with standard deviation of 0.43‰ (n = 19), whereas the median δ97Mo value of detrital sediment fractions from two lakes is - 0.40‰ with standard deviation of 0.36‰ (n = 15). The isotopic composition of Mo in the sediment cores has been found to be dependent on redox conditions of the water columns and the dominant type of scavenging phases. Hydrous Fe oxides have been shown to be an efficient scavenger of Mo from porewater under oxic conditions. Oxidative precipitation of Fe(II) in the sediments resulted in co-precipitation of Mo and significant authigenic enrichment at the redox boundary. In spite of a pronounced increase in Mo concentration associated with Fe oxides at the redox boundary the isotopic composition of Mo in this zone varies insignificantly, suggesting little or no isotope fractionation during scavenging of Mo by hydrous Fe oxides. In a lake with anoxic bottom water a chironomid-inferred reconstruction of O2 conditions in the bottom water through the Holocene indicates that increased O2 concentrations are generally associated with low δ97Mo/95Mo values of the sediments, whereas lowered O2 contents of the bottom water are accompanied by relatively high δ97Mo/95Mo values, thus confirming the potential of Mo isotope data to be a proxy for redox conditions of overlying waters. However, it is pointed out that other processes including input of isotopically heterogeneous Mo and Mn cycling in the redox-stratified water column can be a primary cause of variations in Mo isotopic compositions of lake sediments.

National Category
Geology Geochemistry
Research subject
Ore Geology; Applied Geology
Identifiers
urn:nbn:se:ltu:diva-5770 (URN)10.1016/j.chemgeo.2006.09.006 (DOI)000243813300001 ()2-s2.0-33845876627 (Scopus ID)3f3e7a90-d6dc-11db-8550-000ea68e967b (Local ID)3f3e7a90-d6dc-11db-8550-000ea68e967b (Archive number)3f3e7a90-d6dc-11db-8550-000ea68e967b (OAI)
Note
Validerad; 2007; 20070320 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-09-05Bibliographically approved
Ingri, J., Malinovskiy, D., Rodushkin, I., Baxter, D. C., Widerlund, A., Andersson, P., . . . Öhlander, B. (2006). Iron isotope fractionation in river colloidal matter (ed.). Earth and Planetary Science Letters, 245(3-4), 792-798
Open this publication in new window or tab >>Iron isotope fractionation in river colloidal matter
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2006 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 245, no 3-4, p. 792-798Article in journal (Refereed) Published
Abstract [en]

Temporal variations in the iron isotopic composition, δ56Fe between − 0.13‰ and 0.31‰, have been measured in the suspended fraction in a Boreal river. The major mechanism behind these variations is temporal mixing between two types of particles–colloids, Fe-oxyhydroxides and Fe–C colloids. Data in this study indicate that these two types of colloids have different Fe-isotope composition. The Fe–C colloid has a negative δ56Fe value whereas the Fe-oxyhydroxide colloid is enriched in 56Fe. These two types of colloidal matter have different hydrogeochemical origin. The Fe–C colloid reaches the river during storm events when the upper sections of the soil profile (O and E horizons) are flooded by a rising water table. Colloidal Fe-oxyhydroxides reach the river via inflow and subsequent oxidation of groundwater enriched in dissolved Fe(II).

National Category
Physical Chemistry Geochemistry
Research subject
Chemistry of Interfaces; Applied Geology
Identifiers
urn:nbn:se:ltu:diva-5957 (URN)10.1016/j.epsl.2006.03.031 (DOI)000238672500023 ()2-s2.0-33646516195 (Scopus ID)425f9eb0-7bed-11db-8824-000ea68e967b (Local ID)425f9eb0-7bed-11db-8824-000ea68e967b (Archive number)425f9eb0-7bed-11db-8824-000ea68e967b (OAI)
Note

Validerad; 2006; 20061124 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2024-04-03Bibliographically approved
Baxter, D., Rodushkin, I., Engström, E. & Malinovskiy, D. (2006). Revised exponential model for mass bias correction using an internal standard for isotope abundance ratio measurements by multi-collector inductively coupled plasma mass spectrometry (ed.). Journal of Analytical Atomic Spectrometry, 21(4), 427-430
Open this publication in new window or tab >>Revised exponential model for mass bias correction using an internal standard for isotope abundance ratio measurements by multi-collector inductively coupled plasma mass spectrometry
2006 (English)In: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 21, no 4, p. 427-430Article in journal (Refereed) Published
Abstract [en]

An internal standard (IS) can be used to account for moderate, matrix-related shifts in mass bias using multi-collector inductively coupled plasma mass spectrometry through the empirical, linear relationship between measured isotope abundance ratios for different elements in ln-ln space. Unfortunately, erroneous mass bias corrected isotope abundance ratios may be returned by the model, requiring artificial adjustment of the true isotope abundance ratio of the IS. Although inadequate correction for peak tailing has been convincingly used to explain this problem, our analysis of the literature describing the development of the mass bias correction model using an IS reveals the presence of a source of systematic error. The origin of this error is purely mathematical and is eliminated in the revised model presented, in which mass bias corrected isotope abundance ratios are independent of the isotopic composition of the IS. An expression for computing the total combined uncertainty in the corrected ratio, incorporating contributions from the linear model, the isotopic reference material, and measurements of analyte element and IS in the sample, is also derived.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-5533 (URN)10.1039/b517457k (DOI)000236391400007 ()2-s2.0-33645516745 (Scopus ID)3a984420-8845-11db-8975-000ea68e967b (Local ID)3a984420-8845-11db-8975-000ea68e967b (Archive number)3a984420-8845-11db-8975-000ea68e967b (OAI)
Note
Validerad; 2006; 20061210 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Clayton, R. E., Nederbragt, A. J., Malinovskiy, D., Andersson, P. & Thurow, J. (2005). Data report: Iron isotope geochemistry of mid-Cretaceous organic-rich sediments at Demerara Rise (odp leg 207) (ed.). Ocean Drilling Program. Scientific Results. Proceedings. Scientific Results, 207
Open this publication in new window or tab >>Data report: Iron isotope geochemistry of mid-Cretaceous organic-rich sediments at Demerara Rise (odp leg 207)
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2005 (English)In: Ocean Drilling Program. Scientific Results. Proceedings. Scientific Results, ISSN 0884-5891, Vol. 207Article in journal (Refereed) Published
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-4836 (URN)10.2973/odp.proc.sr.207.109.2007 (DOI)2-s2.0-84856202158 (Scopus ID)2d3d5ebb-51b0-4497-8ca8-b0b8f86d01f9 (Local ID)2d3d5ebb-51b0-4497-8ca8-b0b8f86d01f9 (Archive number)2d3d5ebb-51b0-4497-8ca8-b0b8f86d01f9 (OAI)
Note

Godkänd; 2005; 20120223 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2021-01-25Bibliographically approved
Clayton, R., Hudson-Edwards, K., Malinovskiy, D. & Andersson, P. (2005). Fe isotope fractionation during the precipitation of ferrihydrite and transformation of ferrihydrite to goethite (ed.). Mineralogical magazine, 69(5), 667-676
Open this publication in new window or tab >>Fe isotope fractionation during the precipitation of ferrihydrite and transformation of ferrihydrite to goethite
2005 (English)In: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 69, no 5, p. 667-676Article in journal (Refereed) Published
Abstract [en]

Ferrihydrite and goethite are amongst the most important substrates for the sorption of contaminants in soil and other environmental media. Isotopic studies of the transition elements, particularly those that exhibit more than one oxidation state and show pH- and/or redox-sensitive behaviour at low temperatures, have been shown to be potentially useful present-day and past proxies for redox (or palaeoredox) conditions. We have made preliminary investigations of Fe isotope fractionation that take place during the formation of FeIII (oxy)hydroxides (FeIIIox) from an aqueous FeIII(NO3)3 solution (FeIIIaq) under laboratory conditions. We have attempted to keep the chemical system simple by excluding 'vital effects' and major changes in redox through the maintenance of abiotic conditions and use of FeIIIaq. Isotopic measurements (56Fe/54Fe, 57Fe/54Fe) of the FeIII(NO3)3 stock solution, the original ferrihydrite and the mixed ferrihydrite/goethite-supernatant FeIIIaq 'pairs' were carried out using a double focusing multicollector inductively coupled plasma mass spectrometer. The results reveal an apparent systematic variation indicating larger ΔFeIIIaq-FeIIIox with decrease in the ferrihydrite:goethite ratio, which reflects the time allowed for isotopic exchange. These values range from virtually zero (0.03‰) after 24 h to 0.30‰ after 70 h. In each FeIIIox-FeIIIaq 'pair' the lighter Fe isotope is partitioned into the FeIIIox, leaving the FeIIIaq isotopically heavier. The observed fractionation reflects isotopic exchange of Fe between the FeIIIox and FeIIIaq upon at least a two step transition of ferrihydrite to goethite.

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-3070 (URN)10.1180/0026461056950278 (DOI)000235009100011 ()2-s2.0-31344461357 (Scopus ID)0d63cd40-d70e-11db-8550-000ea68e967b (Local ID)0d63cd40-d70e-11db-8550-000ea68e967b (Archive number)0d63cd40-d70e-11db-8550-000ea68e967b (OAI)
Note

Validerad; 2005; 20070320 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2022-01-14Bibliographically approved
Malinovskiy, D., Rodushkin, I., Shcherbakova, E., Ponter, C., Öhlander, B. & Ingri, J. (2005). Fractionation of Fe isotopes as a result of redox process in a basin (ed.). Geohimiâ, 43(8), 878-885
Open this publication in new window or tab >>Fractionation of Fe isotopes as a result of redox process in a basin
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2005 (English)In: Geohimiâ, ISSN 0016-7525, Vol. 43, no 8, p. 878-885Article in journal (Refereed) Published
Abstract [en]

This paper presents the results of a study of Fe isotope fractionation due to seasonal redox variations in water and bottom sediments (BS) of fresh-water basins. Fe isotopic ratios were measured using multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS). The investigation of suspended matter (SM) at the oxic-anoxic interface showed a significant positive shift in δ56Fe values between anoxic waters with dissolved Fe(II) and SM after Fe(II) oxidation and precipitation of Fe(III) oxides. Data on Fe content and isotope composition suggest that Fe(II) oxidation is accompanied by equilibrium Fe isotope fractionation. Potentials and limitations of the use of Fe isotope data for the reconstruction of pre-existing geochemical conditions in basins are outlined

National Category
Geochemistry
Research subject
Applied Geology
Identifiers
urn:nbn:se:ltu:diva-7930 (URN)65d60910-9cae-11db-8975-000ea68e967b (Local ID)65d60910-9cae-11db-8975-000ea68e967b (Archive number)65d60910-9cae-11db-8975-000ea68e967b (OAI)
Note

Validerad; 2005; 20070105 (bajo)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-02-26Bibliographically approved
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