The measurement of low concentrations of Kr-85 in atmospheric air samples

1994 ◽  
Vol 43-45 (1) ◽  
pp. 725-730 ◽  
Author(s):  
Ludmila Wilhelmová ◽  
Milan Tomášek ◽  
Karel Stukheil
Keyword(s):  
Air Samples ◽  
Atmospheric Air ◽  
Low Concentrations

scholarly journals Air pollution in landfill of wastes other than hazardous or inert / Zanieczyszczenia powietrza na składowiskach odpadów innych niż niebezpieczne i obojętne

2015 ◽  
Vol 41 (2) ◽  
pp. 41-46 ◽  
Author(s):  
Ewa Miaśkiewicz-Pęska ◽  
Mirosław Szyłak-Szydłowski
Keyword(s):  
Air Pollution ◽  
Chemical Analysis ◽  
Microscopic Fungi ◽  
Gas Chromatograph ◽  
Psychrophilic Bacteria ◽  
Air Samples ◽  
Atmospheric Air ◽  
Bacteria And Fungi ◽  
Portable Gas Chromatograph

Abstract Microbiological and chemical analysis of air was carried out on the area of landfill of wastes other than inert or hazardous. The landfill covers 20 ha and 40 000 Mg of wastes is deposited annually. Municipal waste is not segregated at the landfill. The research was conducted in April, May and November 2012. Number of the psychrophilic and mesophilic bacteria and fungi was estimated by a culture-based method. Quantitative determination of sulfur compounds and meteorological and olfactrometric examinations were also carried out. Chemical analysis was conducted with a Photovac Voyager portable gas chromatograph. Air samples were collected at 5 points. The largest group of microbes were psychrophilic bacteria, especially in summer. The highest concentration of hydrogen sulfide and other odorants was found at leachate tank and landfill body. According to the Polish Standard for the assessment of atmospheric air pollution the air in the area of the landfill is classified as not contaminated and sporadically moderately contaminated. In spring and summer the number of microscopic fungi was increased also in control samples.

scholarly journals Analysis of changes in Betula pollen season start including the cycle of pollen concentration in atmospheric air

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0256466
Author(s):  
Agnieszka Kubik-Komar ◽  
Krystyna Piotrowska-Weryszko ◽  
Izabela Kuna-Broniowska ◽  
Elżbieta Weryszko-Chmielewska ◽  
Bogusław Michał Kaszewski
Keyword(s):  
Pollen Season ◽  
Linear Trend ◽  
Birch Pollen ◽  
Volumetric Method ◽  
Pollen Concentration ◽  
Pollen Monitoring ◽  
Atmospheric Air ◽  
Low Concentrations ◽  
Start Dates ◽  
Linear Trends

Birch belongs to the most important allergenic taxa in Europe, therefore information on the start dates of the pollen season is very important for allergists and their patients as well as for climatologists. The study examined changes in the start of the birch pollen season as well as determined the trend of these changes. Pollen monitoring was performed in Lublin (eastern Poland) in the period 2001–2019 using the volumetric method. The Makra-test was used to detect periods with significantly higher or lower average of the onset than the average for the whole dataset. Two significant falls in the average of the pollen season start were found in 2007 and 2014. Besides, taking into account the 2-3-year rhythm of high and low concentrations of birch pollen in the atmospheric air, linear trends were fitted for the subsets of high and low abundance seasons. Significant changes in Betula pollen season start dates were only determined for the highly abundance seasons, while the results for seasons with a low concentration did not allow rejecting the hypothesis about the lack of a linear trend in the changes in the studied parameter. Moreover, a significant polynomial relationship was found between the beginning of a pollen season and the average values of monthly temperatures preceded a season. These analyses show that the start dates of the Betula pollen season are getting significantly earlier. The dynamics of changes differ between seasons with high and low concentrations of pollen.

scholarly journals The helium content of atmospheric air

1946 ◽  
Vol 185 (1000) ◽  
pp. 89-98 ◽  
Keyword(s):  
Appreciable Effect ◽  
Air Samples ◽  
Helium Content ◽  
Atmospheric Air ◽  
Analytical Error

Figures are given for the helium content of air both on the earth’s surface and at heights up to 25 km. No variations exceeding the limits of the analytical error ( ± 0.2 %) have been found in air samples from all over the surface of the globe, and no significant changes have been observed in air up to 20 km. height; however, a small and varying surplus of helium averaging about 3 % above the normal helium content was present in samples from 20 to 25 km. height. It follows from these results that at least up to 25 km. height, gravitational separation of the constituents has no appreciable effect on the composition of atmospheric air.

scholarly journals Results on laboratory-instrumental studies of atmospheric air after fire suppression

2021 ◽  
Vol 311 ◽  
pp. 04008
Author(s):  
V. E. Kriyt ◽  
Yu. N. Sladkova ◽  
M. V. Sannikov ◽  
A. O. Pyatibrat
Keyword(s):  
Building Materials ◽  
Fire Suppression ◽  
Residential Buildings ◽  
Carbon Oxide ◽  
Combustion Products ◽  
Rural Settlements ◽  
Air Samples ◽  
Atmospheric Air ◽  
Factors Analysis ◽  
Wide Range

The paper presents the results of laboratory-instrumental studies of atmospheric air sampled during the first day after fire suppression in different localization. Carbon oxide, hydrochloride, hydrocyanide, nitrogen oxides, sulfur dioxide, and dioxins were determined in the air samples taken. The comparison was made with the hygienic standards established by SanPiN 1.2.3685-21 “Hygienic standards and requirements to ensure safety and (or) harmlessness for humans of environmental factors”. Analysis of the obtained data showed that the concentrations of most of the detected toxic combustion products one day after fire suppression were at a level close to MAC for the working area air, but significantly exceeded MAC established for the atmospheric air of urban and rural settlements. The largest exceedances were obtained at sites such as industrial and residential buildings, which can be explained by the use of a wide range of building materials.

scholarly journals Longitudinal Study of the Contamination of Air and of Soil Surfaces in the Vicinity of Pig Barns by Livestock-Associated Methicillin-Resistant Staphylococcus aureus

2012 ◽  
Vol 78 (16) ◽  
pp. 5666-5671 ◽  
Author(s):  
Jochen Schulz ◽  
Anika Friese ◽  
Sylvia Klees ◽  
Bernd A. Tenhagen ◽  
Alexandra Fetsch ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Sampling Method ◽  
Soil Surface ◽  
Ambient Air ◽  
Methicillin Resistant ◽  
Content Type ◽  
Air Samples ◽  
The North ◽  
Surface Samples ◽  
Low Concentrations

ABSTRACTDuring 1 year, samples were taken on 4 days, one sample in each season, from pigs, the floor, and the air inside pig barns and from the ambient air and soil at different distances outside six commercial livestock-associated methicillin-resistantStaphylococcus aureus(LA-MRSA)-positive pig barns in the north and east of Germany. LA-MRSA was isolated from animals, floor, and air samples in the barn, showing a range of airborne LA-MRSA between 6 and 3,619 CFU/m3(median, 151 CFU/m3). Downwind of the barns, LA-MRSA was detected in low concentrations (11 to 14 CFU/m3) at distances of 50 and 150 m; all upwind air samples were negative. In contrast, LA-MRSA was found on soil surfaces at distances of 50, 150, and 300 m downwind from all barns, but no statistical differences could be observed between the proportions of positive soil surface samples at the three different distances. Upwind of the barns, positive soil surface samples were found only sporadically. Significantly more positive LA-MRSA samples were found in summer than in the other seasons both in air and soil samples upwind and downwind of the pig barns.spatyping was used to confirm the identity of LA-MRSA types found inside and outside the barns. The results show that there is regular airborne LA-MRSA transmission and deposition, which are strongly influenced by wind direction and season, of up to at least 300 m around positive pig barns. The described boot sampling method seems suitable to characterize the contamination of the vicinity of LA-MRSA-positive pig barns by the airborne route.

scholarly journals Environmental straits of Cryptococcus neoformans variety grubii in the city of Santos, SP, Brazil

2005 ◽  
Vol 47 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Maria Cecília Bianchi Soares ◽  
Claudete Rodrigues Paula ◽  
Amanda L.T. Dias ◽  
Marcos Montani Caseiro ◽  
Sérgio Olavo Pinto da Costa
Keyword(s):  
Cryptococcus Neoformans ◽  
Amphotericin B ◽  
Antifungal Agents ◽  
Environmental Strain ◽  
Air Samples ◽  
Atmospheric Air ◽  
Microdilution Method ◽  
Pigeon Droppings ◽  
The City

This study involved a total of 116 samples, 79 taken from pigeon droppings and 37 of atmospheric air taken close to accumulations of excrement. Cryptococcus neoformans var. grubii was isolated from 11 (13.9%) of these samples. Other species of Cryptococcus were also isolated from these samples, such as C. albidus (12.6%) and C. laurentii (8.9%). C. neoformans was not isolated from the air samples, though C. albidus (5.4%) was. All the strains of C. neoformans were found to belong to the A serotype (C. neoformans var. grubii). In regard to the studies with the antifungal agents 5-fluorocytosine, fluconazole, itraconazole, amphotericin B and voriconazole, by means of the microdilution method (EUCAST), we point out that one sample demonstrated resistance to fluconazole, this being especially significant because this is an environmental strain.

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