Elemental Chemical Composition Research Articles

Two-dimensional transition metal chalcogenide nanomaterials for cancer diagnosis and treatment

For more than a decade, the exfoliation of graphene and other layered materials has led to a tremendous amount of research in two-dimensional (2D) materials, among which 2D transition metal chalcogenides (TMCs) nanomaterials have attracted much attention in a wide range of applications including photoelectric devices, lithium-ion batteries, catalysis, and energy conversion and storage owing to their unique photoelectric physical properties. With such large specific surface area, strong near-infrared (NIR) absorption and abundant chemical element composition, 2D TMCs nanomaterials have become good candidates in biomedical imaging and cancer treatment. This review systematically summarizes recent progress on 2D TMCs nanomaterials, which includes their synthesis methods and applications in cancer treatment. At the end of this review, we also highlight the future prospects and challenges of 2D TMCs nanomaterials. It is expected that this work can provide the readers with a detailed overview of the synthesis of 2D TMCs and inspire more novel functional biomaterials based on 2D TMCs for cancer treatment in the future. 2D transition metal chalcogenides (TMCs) have received growing attention in biomedical imaging and cancer treatment because of their large specific surface area, strong near-infrared (NIR) absorption and abundant chemical element composition.

Composition analysis of ceramic raw materials using laser-induced breakdown spectroscopy and autoencoder neural network.

In the ceramic production process, the content of Si, Al, Mg, Fe, Ti and other elements in the ceramic raw materials has an important impact on the quality of the ceramic products. Exploring a method that can quickly and accurately analyze the content of key elements in ceramic raw materials is of great significance to improve the quality of ceramic products. In this work, laser-induced breakdown spectroscopy (LIBS) is used for rapid analysis of ceramic raw materials. The chemical element composition and content of ceramic raw materials are quite different, which leads to serious matrix effects. Building an artificial neural network model is an effective way to solve the complex matrix effects, but model training can easily lead to overfitting due to the high number of spectral features and the limited number of samples. In order to solve this problem, we propose a feature extraction method that combines the linear regression (LR) and the sparse and under-complete autoencoder (SUAC) neural network. This LR + SUAC method performs nonlinear feature extraction and dimension reduction on high-dimensional spectral data. The spectral data dimension is reduced from 8188 to 100 through the LR layer, and further reduced to 32 through the SUAC encoding layer. Further, a quantitative analysis model for the elemental composition of ceramic raw materials is established by the combination of LR + SUAC and Back Propagation Neural Network (BPNN). Since the input data dimension and redundant information are greatly reduced by LR + SUAC, the overfitting problem of BPNN is greatly reduced. Experiment results showed that the LR + SUAC + BPNN method obtained the best quantitative analysis performance compared with several other methods in the cross-validation process.

A novel orange-emitting LaBMoO6:Sm3+ phosphor

Sm 3+ doped LaBMoO 6 phosphors were prepared by using the solid-state reaction method. The microstructure, morphology, chemical element composition, absorption, luminescent performance, decay life and thermal stability of Sm 3+ doped LaBMoO 6 samples were studied. Sm 3+ doped LaBMoO 6 phosphors mainly emit orange light at 596 nm with a decay lifetime of milliseconds under the excitation of 405 nm. The chromaticity coordinates of Sm 3+ doped LaBMoO 6 samples are located in the orange region, which also have great thermal stability. The Sm 3+ doped LaBMoO 6 phosphors can be used as orange-emitting materials in W-LED devices.

Sorption of the Main Dose-forming Radionuclides of Nuclear Power Plants Drain Water on Natural Bentonite in the Process of their Co-ozonation

The article presents the general pattern of the combined process of oxidative decomposition of organic components of simulated nuclear power plant (NPP) drain water and sorption interaction of the imitators of main dose-forming radionuclides (Cs – radiolabel for 137Cs; stable isotopes of Co, Sr, Mn salts) on natural bentonites from the Cherkasy deposit in presence of sorption-reagent compounds — iron (II) and manganese (II) salts. Hydroxides, oxyhydroxides and oxides of Fe and Mn formed during ozonation are predominantly localized on the surface of bentonite. The chemical composition of the main elements of bentonite after drain water ozonation with the addition of iron and manganese salts remains almost the same as that of natural bentonite. The phase composition of bentonite is presented by the main rock-forming mineral montmorillonite and secondary mineral quartz. The iron-containing phases of the ozonised bentonite are Fe(II)- Fe(III) layered double hydroxides (Green Rust), goethite α-FeOOH and magnetite Fe3O4, and the manganese-containing phases are hausemannite Mn3O4, manganese oxide (II) and manganese oxyhydroxide MnO(OH)2. The iron- and manganese-containing phases deposited on the bentonite surface during ozonation are predominantly weakly crystallized or amorphized structures. At the concentration of salts of iron (50 mg/dm3) and manganese (100 mg/dm3) in the drain water, the specific surface area of bentonites with the formed layer of iron and manganese hydroxides, (oxy)hydroxides and oxides increases compared to natural bentonite (34.2 m2/g) and equals to 55 and 51 m2/g, respectively. The degree of radionuclide removal during ozonationof the simulated solution with the initial concentration of cations (Fe2+ — 5 mg/dm3; Mn2+ —10 mg/dm3; Ca2+ — 5 mg/dm3) in the presence of natural bentonite is 137Cs — 78% ± 2%, Sr2+ —97.55% ± 1%, Co2+ — 96.5% ± 1%, Mn2+ — 99.7% ± 0.5%. To preserve the efficiency of 137Cs and Co2+ radionuclide removal, the initial concentration of cations in the solution can be increased to the following values: Fe2+ — 50 mg/dm3, Mn2+ — 100 mg/dm3, Ca2+ — 50 mg/dm3, and to: Fe2+ —500 mg/dm3, Mn2+ — 1,000 mg/dm3, Ca2+ — 500 mg/dm3 for Sr2+ and Mn2+ removal.

THE CHEMICAL AND MINERAL COMPOSITION OF NATURAL ZEOLITES AND THEIR SORPTION PROPERTIES DURING OZONATION WITH DRAIN WATER FROM NUCLEAR POWER PLANTS

The article reveals the regularities of the overall process of ozonolytic destruction of organic components of model drain water from nuclear power plants and sorption of imitators of the main dose-forming radionuclides (Cs — with the isotopic 137Cs label; stable isotopes of Co, Sr, Mn salts) by natural zeolite of the Sokyrnytsky deposit and sorption-reagent compounds — salts of ferrous and manganese (II). The chemical composition of the main elements of zeolite after ozonation with the addition of iron and manganese salts practically does not differ from the composition of natural zeolite. Its phase composition in the ozonation process in the presence of ferrum salts is represented by the main rock-forming mineral clinoptilolite and the secondary mineral — quartz. The main ferrum-containing phase on the zeolite surface is goethite. Secondary phases include Fe(II)-Fe(III) layered double hydroxides (Green Rust) and lepidocrocite, but their relative content is insignificant. For zeolites, after ozonation with the addition of both ferrous and manganese (II) salts, the main phases are clinoptilolite and quartz. Manganese-containing phases on the zeolite surface are represented by hausmannite Mn3O4, manganese (II) oxide, and manganese oxyhydroxide MnO(OH)2. The iron- and manganese-containing phases deposited on the surface of the zeolite in the process of ozonation are mainly characterized by a weakly crystallized or amorphized structure. The main sorbent of dose-forming radionuclides is zeolite, not the iron- and manganese-containing compounds that formed on its surface during ozonolysis. The maximum degree of sorption of 137Cs by zeolite is up to 90% when the concentration of Fe2+ is increased to 50 mg/dm3 or Mn2+ to 100 mg/dm3. The degree of cobalt sorption is 97.5% at the initial typical concentration of competing cations (Fe2+ — 5 mg/dm3; Mn2+ — 10 mg/dm3) and when Mn2+ concentration increases to 100 mg/dm3. The maximum degree of extraction of Sr2+ and Mn2+ is 99.4% and 99.9%, respectively. For effective extraction of 137Cs and Co2+ by zeolite in the ozonation process, an increase in the concentration of competing Fe2+ cations is permissible — 50 mg/dm3; Mn2+ — 100 mg/dm3 in solutions. The efficiency of extraction of Sr2+ and Mn2+ practically does not depend on the concentration of competing cations (Fe2+, Mn2+) in the drain water solutions.

Изучение влияния минерала шунгита на микробиоту кишечника кур-несушек

The aim of the study is to study the effect of the mineral shungite on the intestinal microbiota of laying hens for the needs of poultry farming. To solve this problem in the conditions of the vivarium of the International Laboratory of Molecular Genetics and Poultry Genomics, MVA by K. I. Skryabin, an experiment was set up on laying hens (Hisex Brown cross). The diet of laying hens of the experimental group differed from the control group by introducing a feed additive from shungite at a dosage of 1 kg per ton of feed. In accordance with the goal, the objectives of the study included the calculation of the index of bioconsolidation of microorganisms in microbial biosystems and the index of the composition of chemical elements in shungite and mixed fodder, the construction of a fractal portrait of the corresponding series of numbers, reflecting the series of numbers of microorganisms or the content of chemical elements in shungite. Thus, it was shown that shungite, with its special ratio of chemical elemental composition, favorably affects the self-organization of microbial-organismal biosystems of the intestines of laying hens and the intestinal microbiota of laying hens in general. The ratio of chemical elements in shungite imposes a certain matrix on the ratio of various functional groups of microorganisms in the intestines of birds, which ensures the best joint activity of microorganisms in converting organic substrates into nutrients.

МЕТЕОРНА БАЗА ДАНИХ ЗА СПОСТЕРЕЖЕННЯМИ У 2019–2021 роках ІЗ ВИКОРИСТАННЯМ АВТОМАТИЗОВАНОГО ВІДЕОСПЕКТРАЛЬНОГО МЕТЕОРНОГО ПАТРУЛЯ ХАРКІВСЬКОГО НАЦІОНАЛЬНОГО УНІВЕРСИТЕТУ ІМЕНІ В. Н. КАРАЗІНА

The Database of positional and spectral observations of meteors in 2019–2021 using the automatical video and spectral meteor patrol of the Institute of Astronomy of V. N. Karazin Kharkiv National University has analyzed. The kinematic parameters and elements of the heliocentric orbits of meteoroids were calculated using the methods of meteor astronomy according to the Observation Database. This work describes the methods of processing of spectral video observations. The software “AVSMP_Pro v1” for meteor spectra analysis has been created that allows to generate synthetic spectra and compare them with observed meteor spectra. The data from the NIST ASD electronic database (https://physics.nist.gov/PhysRefData/ASD/lines_form.html) is used for obtaining the composition of chemical elements in the meteoroid. As a result, we obtain an information about the relative quantitative chemical composition of meteoroids and the physical conditions of meteor plasma formation.

Static and Dynamic Compression Performances of Hybrid Fiber‐Reinforced Lightweight Aggregate Concrete

In this study, basalt fiber and polypropylene fiber with different volume ratios were mixed into lightweight aggregate concrete (LAC), and the static compressive strength and dynamic compressive performance of LAC mixed with fiber were tested. The influence of basalt fiber and polypropylene fiber on the stress‐strain relationship and energy conversion relationship of LAC was analyzed. The results show that basalt fiber and polypropylene fiber with an appropriate volume ratio are beneficial to enhance the strength and toughness of LAC, but the mixing effect is better. When the volume ratio of mixed fibers is 0.2%, the compressive strength, elastic modulus, peak strain, and ultimate strain are increased by 61.9%, 23.57%, 32.81%, and 45.14%, respectively, compared with the LAC without fibers. Based on the statistical damage theory, the compressive damage constitutive model of fiber LAC is established; fiber improves the ductility and energy absorption capacity of LAC and shows better impact resistance. Finally, based on modern SEM microscopic testing technology and EDS testing technology, the internal structure and chemical element composition of ordinary LAC and fiber lightweight aggregate were compared and analyzed. The internal compactness of the aggregate concrete improves the strength and toughness of the lightweight aggregate concrete, which reveals the mechanism of the fiber on the LAC from a microscopic point of view.

Analysis and research on fracture cause of connecting bolt of wind turbine spindle

On a certain day in 2018, the main shaft connecting bolt of a wind turbine in a wind farm broke and failed during operation. In order to find out the cause of fracture, the fractured spindle connecting bolt was comprehensively detected and analyzed by means of appearance state analysis, chemical element composition analysis, mechanical property detection analysis, microstructure detection and fracture micro area analysis. The results show that the main reason for the fracture of the main shaft connecting bolt is that the hydrogen penetrates into the bolt surface due to improper process control during the production process, resulting in hydrogen embrittlement in the local area of the thread root. Thus, during the operation of the fan, under the combined action of bending, shear and tensile stress, the connecting bolt of the main shaft cracks at the bottom of the first thread on the side of the self rigid rod with the most concentrated stress, and expands in the form of “herringbone” brittle fracture until the overall fracture failure. It is recommended to check the bolts in the same batch to prevent hydrogen embrittlement in the whole batch.

Reduction in electrical resistivity of bismuth selenide single crystal via Sn and Te co-doping

The structural and thermoelectric transport properties of melt-grown Bi2Se3 single crystals are systematically investigated with the co-doping of Sn and Te in the temperature range 10–400 K. The powder X-ray diffraction and high-resolution X-ray diffraction studies confirm the hexagonal crystal structure with R3‾m space group. Images of the field emission scanning electron microscopy have shown crack-free smooth surface morphological features. Energy dispersive analysis of X-ray authorizes the chemical composition of elements in the samples. The degenerate semiconducting nature is observed in the entire series of samples with 6.8 times reduction in electrical resistivity for (Bi0.96Sn0.04)2Se2.7Te0.3 compared to the pristine Bi2Se3. The maximum ZT value of ∼0.32 is obtained for Bi2Se2.7Te0.3 single crystal at 400 K, about 7.4 times larger than that of Bi2Se3.

Microstructural, linear and nonlinear optical study of spray pyrolysed nanostructured La–ZnO thin film: An effect of deposition temperature

Transparent Zn0.97La0.03O nanostructures were prepared at different temperatures (300 °C–500 °C) on borosilicate glass substrates using the chemical spray method. The present work focused on the dependence of the substrate temperature (Ts) on the different characteristics of the prepared films. In all the deposits, a polycrystalline structure of La3+ doped ZnO (LZO) film with a preferred orientation along the (101) plane was observed, and a larger crystalline size was noticed for films deposited at lower temperatures. The surface morphology changed from spherical to fibrous structure as a function of the temperature of the substrate. The chemical state and elemental compositions were confirmed by XPS analysis. The linear optical band gap and third-order nonlinear absorption coefficient of LZO films were observed to increase with an increase in substrate temperature. A maximum transmittance was observed for the sample prepared at 450 °C with the least optical limiting threshold value of 0.96 kJ/cm2. The presence of various defects in the film was confirmed through photoluminescence emission, and red emission was noticed for samples prepared at 450 °C and 500 °C.

Petrology and geochemistry of metapelites from Asenitsa unit, Central Rhodope massif

Asenitsa unit metapelites (Central Rhodope massif) have a high variability in mineral, bulk chemical and trace element composition. Kyanite, staurolite and garnet are the major minerals in schists and show intensive retrograde change. Discrimination diagrams based on immobile trace elements indicate continental island arc or active margin setting of deposition.

Influence of leachates on geotehnical and geochemical properties of termite mound soils

This study investigated the influence of leachate prepared from Telfairia occidentalis on the geotechnical and geochemical properties of termite mound soil obtained from the premises of the federal university of agriculture, Abeokuta, south-western Nigeria. The termite mound soil samples were collected from three different locations and each sample collected was contaminated by mixing with leachates in percentage increments of 0% 10%, 15% and 20% of dry weight of the air-dried soil. The soil samples were subjected to Atterberg limits and hydraulic conductivity tests for geotechnical observation and X-ray fluorescence tests for geochemical tests. The range of values for the geotechnical analyses were obtained as; plastic limit (9.1% – 14.2%), liquid limit (28.6 % – 61%), plasticity index ((18.2% – 49.5%) and hydraulic conductivity (1.85 – 4.1 x 10-8) cm/sec) with a resultant reduction in the plastic limit, liquid limit and plasticity index values but an increase in the hydraulic conductivity of the samples as the leachate concentration increased. The results from X-ray fluorescence analyses after 20% leachate contamination showed that the major elemental chemical composition for the three samples were comprised of SiO2 (56.25 – 56.5%), Al2O3 (28.42 – 28.50%), Fe2O3 (4.46 – 6.5%), TiO2 (1.08 – 1.23%), CaO (1.45 – 1.60%), P2O5 (0 – 0.04%), K2O (0.9 – 6.1%) and MnO (0.02 – 4.7%). There was a marginal alteration of the indices with the values inferring the presence of a minimum composition of feldspar and a major composition of quartz-rich minerals and thus lending more credence to the presence of silicates as shown from the X-ray fluorescence results. It also infers that the termite mounds are predominantly made from sand materials. The termite soil samples obtained from the aforementioned locations may not be suitable for engineering works unless stabilization procedure is adopted.

Synthesis of Ni – Ti alloy from Elemental Powders by Direct Laser Deposition

The paper investigates current trends in the development of advanced additive manufacturing technology — laser cladding or direct laser deposition (DLD). This technology for the manufacture of metal parts is less known than selective laser melting (SLM) due to its low accuracy, but it has great opportunities for the manufacture of large single parts from functional alloys. The paper analyzes the prospects and economic efficiency of the DLD modification, which consists of the synthesis of an alloy with the simultaneous building of a product from elemental powders. The synthesis of the alloy is carried out using the example of the Ni – Ti system. The economic assessment of the cost of the initial components shows the average cost of raw materials for this alloy at 200 $/kg at the cost of an alloyed alloy from 250 $/kg. An experiment of building a thin-walled and multilayer sample of an equiatomic alloy from a 55Ni — 45Ti mechanical powder mixture in a protective chamber is presented in the practical part of the work. It is shown that the presence of a protective chamber for this alloy significantly affects the chemical composition and distribution of elements within the track but is not a prerequisite for the shaping of the part. The grown thin-walled bushing showed an excess of titanium in its composition relative to the initial mixture. On the other hand, the multilayer sample in the form of a cylinder was very close to the original composition with an accuracy of one hundredth of Ni and Ti (in mass %). The results showed that this method is promising for alloy formation and the simultaneous building of a functional material requiring high precision in chemical composition. This research was funded through a grant by the Russian Science Foundation; Project No. 19-79-30002.

Study of an Ecological Cement-Based Composite with a Sustainable Raw Material, Sunflower Stalk Ash.

The use of plant ash as a sustainable cementitious material in concrete composition is a widely researched subject in the construction domain. A plant studied so far more for its thermal insulation properties, sunflower, was analyzed in this study with regard to its ash effects on the concrete composition. The present research aimed to analyze the effects of a 2.5%, 5%, 7.5%, 10%, 15%, 20%, or 30% volume replacement of cement by sunflower stalk ash (SA), a sustainable cementitious material, on the concrete compressive strength at 28 days and three months, the flexural and splitting tensile strengths, the resistance to repeated freeze–thaw cycles, and the resistance to chemical attack of hydrochloric acid. The elementary chemical composition of the SA and the composites was included also. According to the experimental results, SA decreased the values of the compressive and tensile strength of the concrete, but it improved the concrete behavior under repeated freeze–thaw cycles and under the action of hydrochloric acid. A percent of 10% of SA led to a much more pronounced development of compressive strength over time than conventional concrete (26.6% versus 12%).

Processing of waste slag of non-ferrous metallurgy for the purpose of its complex utilization as a secondary mineral raw material

This article provides an overview of the methods of processing slag from welting is given, different approaches and attempts of scientists from a number of countries aimed at processing such slags are considered. In the course of the review it was found that a huge number of the following methods and methods of processing from waelz slag, there is not a single option that has sufficient complexity of processing, and that at the moment are in the dumps toxins from waelz never found its use as a secondary raw material. The elemental chemical composition of the slag from welting, which is represented by compounds of calcium, silicon, iron, aluminum, carbon and heavy nonferrous metals in the form of zinc and lead, is determined. Thus, it is established that for many years, the slags from waelz that have not found their application and are in the dump at the moment continue to have a polluting effect on the environment. Ill. 1. Ref. 63.

Study on the colouring, microstructure, and glaze formula of ‘Ru‐type ware’ excavated from Qingliang Temple kiln in Henan Province, China

AbstractThirty samples of ‘Ru‐type ware’ glazes from Qingliang Temple Kiln were selected. The dominant wavelength, microstructure, and chemical composition of elements in the glaze formula of each glaze sample were measured and studied through integrating‐sphere spectrophotometry, field emission scanning electron microscopy, and energy‐dispersive X‐ray fluorescence analyses. The energy‐dispersive X‐ray fluorescence data were processed by multivariate statistical analysis. The following conclusions were drawn. With the dominant wavelength range of 535–660 nm, Ru‐type ware glaze falls into the category of a celadon‐glazed system. The glaze formulas of different glaze colours of Ru‐type ware are comparable but not identical, the difference in content of colour oxides Fe2O3 and TiO2 resulting in the various glaze colours of Ru‐type ware. For the first time, Ru‐type ware glaze is revealed as a crystallisation‐phase glaze. This finding demonstrates that the firing process of the Ru‐type ware was inherited to some extent from Ru Guan ware.

Impact of Radio Frequency Plasma Power on the Structure, Crystallinity, Dislocation Density, and the Energy Band Gap of ZnO Nanostructure

The aim of this study is to investigate the effect of radio frequency (RF) plasma power on the morphology, crystal structure, elemental chemical composition, and optical properties of ZnO nanostructure using a direct current magnetron sputtering technique. This study emphasized that the growth rate and surface morphology of the polycrystalline ZnO were enhanced as the radio frequency (RF) plasma power increased. This can be observed by fixing other parameters such as the growth time, substrate temperature, and chamber partial pressure. The RF plasma power alteration from 150 to 300 W can produce uniform nanograin, spheroid, and nanorods. Additionally, the RF plasma power alteration leads to the alteration in the ZnO nanorod diameter from 14 to 202 nm. It was observed that the XRD intensities are increased at higher plasma powers. This, perhaps, can be inferred from the transformation of the granular microcrystals to the needlelike or platelike large crystals, as already examined using SEM images. This also has an impact on the average crystalline size, which increased from 10 to 40 nm on increasing the RF plasma power. Moreover, the increase of the RF plasma power has an obvious impact upon the optical band-gap energy, which was accordingly decreased from 3.26 to 3.22 eV. Finally, the absorption band edge was shifted to a lower-energy region due to the quantum size effect at the nanorange.

Dredged Dam Raw Sediments Geotechnical Characterization for Beneficial Use in Road Construction

The present research work aims to evaluate the feasibility of reusing raw dredged sediments from the Dam of Fergoug (northwestern Algeria) as an alternative material for road construction. These sediments were added to volcanic tuff from the quarry located near the village of Sidi Ali Cherif, in the town of Sig (northwestern Algeria), with contents of 5, 10, 15, 20 and 25% by total weight of tuff. To achieve this goal, sediments were extracted from Fergoug dam and an experimental program was carried out to study the possibility of valorizing these sediments to be used in road construction. The soils were subjected to a series of physical and chemical tests. Their physical properties, including the Atterberg limits, specific gravity, grain size distribution, and organic content were determined according to standard methods. Then, their chemical properties, including pH, elementary chemical composition using the X-ray fluorescence spectrometry and mineralogical composition identified by X-ray diffraction, were obtained by means of standard methods. The first experimental results from the tested formulations demonstrated the feasibility of reusing the valorized dredged sediments in road construction. Afterwards, the modified Proctor and ICBR tests were carried out, and the results obtained turned out to be quite satisfactory.

Study of the Behavior of Air Parcels, using PIXE, Hysplit and Wind Rose in the Metropolitan Zone of Toluca Valley, Mexico

Aim: The objective of this work was to determine the behavior of the trajectories of the air plots in two sites (San Mateo Atenco-(SM) and San Lorenzo Tepaltitlán-(SL)), in the atmosphere of the Metropolitan Zone of the Toluca Valley (MZTV).
 Methodology: In the atmosphere of the MZTV, using HYSPLIT a Backward trajectory direction analysis was performed from June 29 to July 8, 2021, considering for each day the summertime schedules of the center, indicating its Coordinated Universal Time (UTC). An ANOVA analysis (with a significance level of α=0.05) was performed for the concentrations of SM and SL obtained with PIXE, with the objective of seeing the equality of their behavior.
 Results: The behavior of the direction of the trajectories of the air plots in both sites is similar and the trajectories for the same day are the same in both sites but different on another day; It was determined that during night-day (19 to 12 h of the following day) the behavior is similar and changes during the remaining time, being variable. In general, the origin of the trajectories of the air plots for both sites of the MZTV is predominantly from the southeast, a situation that was confirmed with Wind Roses. Of the ANOVA analysis, the p-value was in all cases greater than the significance level of 0.05, the null hypothesis was accept, and it is possible to conclude that the elemental chemical composition of PM2.5 have equal means in both sites.
 Conclusion: Among other, it is possible to consider the behavior of meteorological parameters and thus take them into account for sampling studies of criteria pollutants such as PM2.5.