Stan Halas

Stan Halas
Maria Curie-Sklodowska University in Lublin · Mass Spectromerty Laboratory

Dr., PhD (in Poland: prof. zw. dr hab.)

About

258
Publications
39,374
Reads
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3,283
Citations
Citations since 2016
23 Research Items
1158 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Additional affiliations
October 2015 - present
Maria Curie-Sklodowska University in Lublin
Position
  • Professor Emeritus
Description
  • Developments in IRMS, stable isotope analysis, K-Ar dating, isotope geochemistry
January 2011 - present
January 2007 - present
The University of Calgary
Education
October 1963 - June 1968

Publications

Publications (258)
Article
Full-text available
Work function Φ is a crucial factor in improving the high-k/metal gate stack. Here we present a systematic study of the strain-dependent work function on the Pt metal gate (100) surface using the first-principles calculation. We find that the compressive strain increases Φ, while the tensile strain decreases its value, with the biaxial strain leadi...
Article
Refinements have been made to achieve over 99% yield in the conversion of CO to CO2 in order to improve the reproducibility and accuracy of δ18O measurements in sulfates. BaSO4 (10-15 mg) was mixed with an identical amount of spectrographic-grade graphite and loaded into a Pt boat. The mixture was gradually heated to 1100 °C to reduce sulfate to CO...
Article
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The curative waters of HCO₃-SO₄-Mg-Na+H₂S chemical type and 0.6-0.8 g/dm³ total dissolved solids are exploited in Horyniec Spa located at the northern boundary of the Carpathian Foredeep, near the Polish-Ukrainian border. Although these waters occur at relatively shallow depths (their aquifer is encountered about 30 m below the ground surface), the...
Article
The most precise method of chlorine isotope analysis described to date is based on the isotope ratio mass spectrometry (IRMS) of chlorine quantitatively converted into chloromethane, CH(3)Cl. This gas can be produced from several chlorine-containing compounds and analyzed by IRMS. However, the mass spectrum of chloromethane is rather complicated an...
Article
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A new semi-empirical formula was devised for liquid-vapour fractionation at thermodynamic equilibrium, which is valid for the whole temperature range, i.e. from the freezing to the critical temperature, Tc. The new formula contains three parameters (A, B and C) only: 10(3) ln alpha = ((A/T2) - (B/T))(1-x)+ C((Tc-T)/(T2))X, where X is the ratio of s...
Article
Nitrates are bioavailable compounds, which are necessary for every living organisms. However, their excess could be harmful, because it could lead to, i.e., methemoglobinemia, formation of carcinogenic nitrosamines and reservoir eutrophication. Isotopic analysis of δ¹⁵N and δ¹⁸O in nitrates allows to distinguish their different sources. To simplify...
Article
Rationale: In order to make a single filament TIMS mass spectrometer more versatile and efficient in element isotope analysis, a multifilament ion source has to be employed. In the currently used three filaments ion sources the same sample must be loaded on all the evaporator filaments, because of the possibility of cross contamination. Methods:...
Article
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The thermal waters produced by wells and springs from the Buda Thermal Karst in Budapest and its surroundings are rich in dissolved sulphate. Radiocarbon ages indicate that waters of T >45 ℃ were infiltrated during the Ice Age (more than 11 thousand years ago), on the higher elevations of the Buda-Pilis Hills, whereas waters of lower temperatures w...
Article
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Abstract: Large-scale shale gas prospecting in the Polish part of the East European Platform did not discover large reserves of this resources. The article presents new research indicating that one of the reasons for the lack of shale gas relates to the thermal history of the Lower Palaeozoic rocks. Illite-smectite palaeothermometry was used to rec...
Article
Résumé – Traceurs isotopiques multiples à partir de sulfates hydratés de Permien-Trias : implications pour l’interaction fluide-minéral. Les compositions isotopiques d’eau de cristallisation et des ions sulfate dans le gypse et la polyhalite ont été utilisées comme traceurs des événements liés à leur formation et à leur évolution ultérieure, comme...
Article
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Late Permian to Triassic phases from the evaporite deposits of the Northern Calcareous Alps (NCA) and Central Alpine Mesozoic (CAM) were analysed for sulfur and oxygen isotope compositions. For Late Permian, most of the δ34S values are in the 11 to 12‰ range. Röt type sulfates of Early Triassic age, are characterised by a heavy sulfur isotopic comp...
Article
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New geochronological investigations for the Slănic Formation, correlated with previous bio- and lithostratigaphical information, allow for a better succession of events for the Middle Miocene, including the absolute age of the Badenian salinity crisis in the bend sector of the Eastern Carpathians. Within the green Slănic Tuff, white tuff layers whe...
Article
Rationale: The goal of this research was to construct an effective gas ion source for isotope ratio mass spectrometry, which generates sufficiently strong and stable ion beams for multiple isotope ratio analysis of sulfur and oxygen from readily available gases such as SO2 , CO2 , CO, O2 and chlorine from CH3 Cl gas. Methods: By means of a 60° s...
Article
Full-text available
Sulphur dioxide is still a major industrial pollutant in the atmosphere. However, its origin is not always easily traceable, particularly at regional scale where numerous sulphur sources coexist. Geochemical tracers, such as the stable sulphur (δ³⁴S) and oxygen (δ¹⁸O) isotopic compositions of sulphates in precipitation, have been successfully appli...
Article
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Stable isotopic composition of hydrogen and oxygen of precipitation and groundwater along with climatic information from a region situated in the external part of the South Carpathians were collected every month from 2012 to 2015. Climate monitoring indicates that the region is characterised by a high continentality index, and seasonal distribution...
Article
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Noble gas and stable isotope analyses can provide useful information on the origin of groundwater including residence time of different mixed components. This paper focuses on two unique therapeutic water areas of Southeast Poland (Horyniec Spa and Iwonicz Spa Lubatowka Spa). Groundwater from the well Róża-III in the Horyniec Spa is of purely meteo...
Article
The study was carried out on the Sulejów dam reservoir (Central Poland). Water and sediment samples were collected between February and October 2006. Sulfur compounds in the sediment were chemically extracted and subjected to isotopic analysis. Large variability of SO4²⁻ concentration in the water column (from 10.3 to 36.2 mg/dm³) and the isotopic...
Article
Please cite this article in press as: Drzewicki, W., et al., The variability of 34 S and sulfur speciation in sediments of the Sulejów dam reservoir (Central Poland). Chemie Erde-Geochemistry (2017), http://dx. a b s t r a c t The study was carried out on the Sulejów dam reservoir (Central Poland). Water and sediment samples were collected between...
Article
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The Zechstein Limestone of the Bonikowo 2 borehole is composed of limestone with varied dolomite content and is slightly thicker (3.4 m) than other supposed condensed sections in SW Poland. The microfacies (mostly bioclastic wackestones-packstones) are characteristic of open marine limestone deposited in deep shelf environments. The common occurren...
Article
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The sulfide minerals from old mafic intrusion rocks from the Kola Peninsula were analyzed on stable sulfur isotopes. These samples were already dated by the Sm-Nd method. These sulfide samples were evaluated upon a geochemical composition by ICP-MS. The sulfide mineral samples were selected from the main ore-bearing rocks of the Monchetundra layere...
Article
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This paper presents the results of investigation of decalcification of acid sandy and loamy sand soils by infiltration waters, and potential Ca-leaching after liming treatment. For this purpose, monthly measurements were made of the concentration of CO2 in the soil air, dissolved inorganic carbon in the soil waters, and their ionic composition. The...
Article
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The concentration of carbon dioxide dissolved in water (CO2(aq)) was measured in consecutive phases of the hydrological cycle. Its potentially possible degassing from groundwaters to the atmosphere was also assessed. The research was conducted in the area of occurrence of carbonate rocks of the Lublin Upland and Roztocze (SE Poland). The results of...
Article
RationaleThe PR-39 porcine cathelicidin occurs naturally in animal neutrophils. Its main function is antimicrobial activity, which potentially can be used in antibiotic treatments in veterinary medicine. Investigations concerning such a use require the detection and quantification of PR-39 in a given sample. The aim of this work is to determine the...
Article
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Groundwaters of the Wygnanowice area (Poland) were studied for dissolved inorg. C and 13C/12C isotope ratio in CO2. The concns. of CO2 in spring draining porous Quaternary rocks were higher than that in soil waters and water in solid rocks of Cretaceous aquifer, which are drained to the spring and the Giełczew river. The anal. of 13C isotope showed...
Article
Full-text available
We describe a new geochemical tool that could provide temperatures of ancient basins in which massive evaporites were deposited: the oxygen isotope composition of fine crystalline quartz found in large halite bodies. Such quartz is well preserved from post-depositional alterations and it can be relatively easily separated. For the purpose of this s...
Article
Full-text available
We have demonstrated that cryogenic separation of glauconite and foraminifera from the host rock allows to preserve the integrity of extracted specimens, assures minimal damage and causes no artificial fractionation. The K/Ar dating of two glauconite samples from Cretaceous/Paleogene boundary in the Nasiłów outcrop yields 62.0 and 66.3 Ma. The disc...
Article
We report the first δ37Cl data for surface waters of the Akyatan lagoon, Turkey, from 12 stations sampled over the period 2005 to 2006. The recorded variation of δ37Cl values is fairly small, from -0.4 to +0.6 ‰ vs. SMOC, though the environmental conditions were highly variable seasonally. The salinity of the studied waters varied from 2.8 to 95 g/...
Article
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We demonstrate the annual cycle of methane in fresh sediments of two lakes - Moszne (E Poland) and Skrzynka (W Poland). The vertical gradient in δ13C(CH4) values varied widely from about -4.5‰/(-1 m) in late summer 1993 to about +2.5‰/(-1 m) in late winter, in the uppermost sediment profiles of about 3-meters in length. These vertical variations ap...
Article
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The paper presents new results of stable isotope ratios (18O/16O, 2H/1H and 37Cl/35Cl) in a few representative mineral waters of the Subcarpathian area. The observed temporal variability of 18O/16O and 2H/1H in waters has thrown a new light onto the origin of these waters. Analysis of 37Cl/35Cl in chlorine ion is indicative of its origin, at least...
Article
Modulating the effective work function (Φeff) of metal electrodes is both crucial and challenging in metal-oxide-semiconductor transistors. The introduction of atomic dopants is shown to be an effective method to modify the interface Φeff. Here we apply the first principles calculations to systematically explore the impact of incorporation of the n...
Article
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This paper presents the results of a geochemical and isotopic study of technogenic soils and acid pool waters in the abandoned mine tailings pile and its potential impact on the adjacent farmers’ wells at the village of Serwis (south-central Poland). The acid tailings pools showed strong trace element and REE signals. These acid pools were featured...
Article
Full-text available
Nitrogen is an essential element for life. One of its available forms are nitrates – the compounds playing a key role in the biogeochemical N cycle. However, excessive amounts of nitrates may be harmful to organisms and the environment, therefore in recent years the emphasis is on continuous monitoring of quality of consumed water. Nitrates from di...
Article
Full-text available
We describe a newly constructed dual inlet system and triple collector for precision study of sulfur isotope anomalies, Δ 33 S, using negative ion mass spectrometry. SO 2 gas is admitted to the ion source where it is ionized either to SO-or S-by low energy electrons (resonant ionization) and the ion beam is analyzed by a single focusing magnetic an...
Article
Full-text available
This geochemical study aims to resolve genesis of precipitation spots on the walls on the Nydeggbrücke in Bern, Switzerland. The bridge is composed of Jurassic limestone and dolomites and coated on both sides with Miocene flysch sandstone. As a result of infiltration of aqueous solutions derived directly from the road embankment into the sandstone,...
Article
Full-text available
We describe a newly constructed dual inlet system and triple collector for precision study of sulfur isotope anomalies, Δ 33 S, using negative ion mass spectrometry. SO 2 gas is admitted to the ion source where it is ionized either to SO-or S-by low energy electrons (resonant ionization) and the ion beam is analyzed by a single focusing magnetic an...
Article
Full-text available
In this paper has been derived the most relevant propagation of error formula in the case when argon peaks are measured. The most frequently cited formula published by Cox and Dalrymple deals with the isotope ratios, instead of isotope peaks heights, considered as independent variables.
Article
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Bulk metallic glasses (BMGs) are characterized by a number of remarkable physical and mechanical properties. Unfortunately, these same materials are often intrinsically brittle, which limits their utility. Consequently, considerable effort has been expended searching for correlations between the phenomenologically complex mechanical properties of m...
Article
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Contamination of soil with petroleum products is a major environmental problem. Therefore, one of the issues related to environmental protection is assessment of the ability of soil microbial populations to biodegrade petroleum-derived substances. The aim of the study was to compare the dynamics and fractionation of carbon isotopes during biodegrad...
Article
The basinal facies of the Lopingian Zechstein Limestone in SW Poland consists of thin (often less than 1 m thick) limestones and/or dolomites, often containing the Kupferschiefer (few tens of centimetres thick) at their base, and local thick (up to 90 m) reefal carbonates. The δ13C curve of these basal Zechstein deposits strongly suggests that even...
Article
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In this paper we try to reconstruct the spatial distribution of stars in globular clusters (GCs) from heuristic statistical ideas. Such 3D radial distributions are important for understanding physical conditions across the clusters. Our method is based on converting spherically symmetrical functions such as exp(-r2/s2), exp(-r/s), 1/(1 + r2/s2)2 an...
Article
Rocks from the Slyudyanka valley (Khamar-Daban Mountain), near the Pierieval quarry, were analysed for petrographic characteristics. Rocks samples have been investigated with the use of optical and electron microscopes as well as XRD methods. The outcrops on the valley slopes reveal the presence of crystalline schists and marbles with granitoid vei...
Article
Full-text available
The paper presents the results of determinations of stable S and O isotopes of dissolved sulfates and O and H stable isotopes of waters from three ponds, that is, Marczakowe Doły acid pond, Marczakowe Doły fish pond and Podwiśniówka acid pit pond, located in the Holy Cross Mountains (south-central Poland). The δ34SV-CDT and δ18OV-SMOW of SO42− in w...
Article
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The Styrian Basin basin is situated at the south-eastern margin of the Eastern Alps. Two basement highs separate the Styrian Basin in sub-basins: the Middle Styrian Basement High divides the shallower Western Styrian Basin (with ~800 m thick Neogene sediments) from the Eastern Styrian Basin (with a ~3000 m thick infill). A second, the South Burgenl...
Article
Full-text available
We describe a new geochemical tool that could provide temperatures of ancient basins in which massive evaporites were deposited: the oxygen isotope composition of fine crystalline quartz found in large halite bodies. Such quartz is well preserved from post-depositional alterations and it can be relatively easily separated. For the purpose of this s...
Article
The Holocene Baltic Sea has been switched several times between fresh water and brackish water modes. Modern linear sedimentation rates, based on 210-Pb, 137-Cs, and Hg dating of surface sediments, are between 0.1 and 0.2 mm per year. The change in paleo-environmental conditions caused downcore gradients in the concentrations of dissolved species f...
Article
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The purpose of writing this article was to derivate the formula for the third cosmic velocity using only the laws of conservation in the heliocentric reference system. It turns out that it can be done by using elementary mathematics, thanks to which the reasoning and calculations are afforda­ble for one interested in this subject. By the way, we wa...
Article
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Streszczenia artykuów Summaries of the articles KOWALECZKO P., SULKOWSKI J.: Badanie poprawnoci wskaza odbiorników systemu nawigacji satelitarnej GPS w rodowisku za-kócanym Elektronika (LIV), nr 1/2013, s. 64 W artykule poruszono tematyk podatnoci systemu nawigacji satelitarnej GPS na zakócenia zewntrzne. Na wstpie omówiona zostanie zasada dziaania...
Article
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Several decades ago during exploration for additional resources of tap water a saline water deposit (Cl-Na, J, Fe, B type) has been discovered in the area of Rzeszów hospital park. Nowadays this water is exploited for balneological purposes. In the frame-work of this study for the first time the following stable isotopes: δ18O i δD, δ13C, δ37Cl and...
Article
Full-text available
In this paper I try to explain why the potassium-argon dating method was developed much later than other radiometric methods (like U-He and U-Pb), which were established at the beginning of the 20 th century. In fact the pioneering paper by Aldrich and Nier (1948) was published 50 years after the discovery of polonium and radium, when nearly all th...
Article
The environmental conditions of the Szczecin Bay, which existed prior to Szczecin Lagoon, have been reconstructed on the basis of the stable carbon and oxygen isotope (18O and 13C) analysis and radiocarbon dates obtained for subfossil shells of Cerastoderma (Cardium) glaucum. The shells in the collected core were well preserved in their life positi...
Article
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In this short note we have reconsidered the Jeans criterion for gravitational contraction of a gas nebula at different tem-peratures, from the present-day background radiation temperature (2.8 K) to those which existed at the early stage of the Universe. We demonstrate that the initial mass of quasars cannot be of the order of single galaxy masses,...
Article
Full-text available
Several decades ago during exploration for additional resources of tap water a saline water deposit (Cl-Na, J, Fe, B type) has been discovered in the area of Rzeszow hospital park. Nowadays this water is exploited for balneological purposes. In the frame-work of this study for the first time the following stable isotopes: δ18O i δD, δ13C, δ37Cl and...
Article
Full-text available
We report calculated values of isotope fractionation factors between chlorine, bromine and sulphide hydrated anions and respective gaseous compounds: hydrogen chloride, hydrogen bromide, molecular chlorine and bromine and hydrogen sulphide. For the calculation of the reduced partition function ratios (β-factors) of hydrated Cl(-), Br(-) and S(2-) a...
Article
Full-text available
The work function of 75W25Re alloy has been determined by the thermionic emission method aided by computer simulation of resistive heating of a cathode made of the alloy wire. The obtained values are temperature dependent, which is due to desorption of oxygen atoms which enhance the work function. The lowest value of 4.7 eV was obtained for the hig...
Article
Full-text available
The paper presents the results of interdisciplinary (multiproxy) palaeoenvironmental studies of peat — calcareous tufa depositional sequences of spring mire from Radzików site (east Poland). Analyses of three biotic proxies (plant macrofossils, pollen, molluscs) were supplemented with sedimentological, geochemical, oxygen and carbon stable isotopes...
Article
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We describe a simple electrostatic model of hydrated ions [M(H2O)n]+ (n = 3–18, M = Li, Mg, Ca, K) which enables to calculate ion vibration frequency of the ground state. In this model the considered ion with a reduced mass vibrates in quasispherical well formed by the ion-dipole attractive potential and repulsive valence potential, these simplific...