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A Kitchen Degreaser Containing Monoethanolamine Can Alter Indoor Aerosol Composition for Days.
Schwarz, Jaroslav ; Makeš, Otakar ; Ondráček, Jakub ; Cusack, Michael ; Talbot, Nicholas ; Vodička, Petr ; Kubelová, Lucie ; Ždímal, Vladimír
Using of such degreaser and consequences related to indoor aerosol are described in this study. Monoethanolamine, a part of a commercial degreaser being used in kitchens, was able to replace ammonium in its sulfate and nitrate salts in the indoor environment, while those salts usually form up to half of PM2.5 aerosol mass indoors.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22017103110530 - PDF
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Transformation of Aerosol Particles during Transport from Outdoor to Indoor Environment.
Ondráček, Jakub ; Talbot, Nicholas ; Kubelová, Lucie ; Makeš, Otakar ; Cusack, Michael ; Schwarz, Jaroslav ; Vodička, Petr ; Zíková, Naděžda ; Ždímal, Vladimír
One summer (2014) and one winter (2015) campaign (both lasting three weeks) were conducted to assess the indoor/outdoor physical and chemical properties of aerosol in an unoccupied apartment. The main purpose of these campaigns was to observe the changes in aerosol particles before and after their transport from outdoors to indoors. The most important parameter – the I/O ratio was obtained from indoor/outdoor measurements of aerosol number size distribution as well as chemical composition. The I/O ratios can reveal the changes in particle size and physicochemical characteristics indoors in relation to the size distribution and chemical composition outdoors, and physical parameters such as wind speed, temperature, and RH.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22017103110370 - PDF
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I/O Aerosol in Kindergarten - Case Study.
Ondráček, Jakub ; Talbot, Nicholas ; Cusack, Michael ; Vodička, Petr ; Ždímal, Vladimír ; Schwarz, Jaroslav
In last decades, people spend more and more time indoors. When various indoor sources are present, the indoor air quality is driven mainly by these sources. Without the presence of significant indoor sources, the situation is very different and the concentration of aerosol particles in indoor environment follows behavior of outdoor particles (taking into account losses of aerosol particles due to deposition on indoor surfaces and during penetration indoors. Many epidemiological studies show direct link between dose/exposition to fine (< 1µm) and ultrafine (< 100 nm) particles and adverse health effects. With regards to the fact that indoor environment is besides the adults occupied usually also by kids in longer time periods, it is very important to study the indoor environment in a great detail and to understand the behavior of aerosol particles indoors. In the case of the kids being exposed to the indoor aerosol particles, the adverse health effect can be more pronounced and the consequences more dangerous. Nevertheles, at the same time it is necessary to monitor the outdoor environment as well by observing its changing daily pattern and trying to identify the possible sources of outdoor air pollution.\n
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22016102412233 - PDF
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Penetration Through CE-Marked Respirators - Cut-Based Versus Manikun-Based Method
Ondráček, Jakub ; Serfozo, N. ; Zíková, Naděžda
This work presents size-resolved penetration testing of 13 commercially available filtering facepieces (FFP1, FFP2 and FFP3 filtering classes) on pieces of filtration material (47 mm in diameter) cut from various FFRs (referred as cut-based). Second objective of this work was to measure the size-resolved penetration of 9 complete FFRs (selected from identical filtering facepieces as in the first case) placed on the manikin (refered as manikin-based). The results obtained by these two methods were compared and the real MPPS of all FFRs obtained by both methods were estimated.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22015102910290 - PDF
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Particle Size, Mass and Chemical Transitions from an Outdoor to Indoor Environment in Prague, Czech Republic with Attention to Nitrate
Talbot, Nicholas ; Kubelová, Lucie ; Makeš, Otakar ; Cusack, Michael ; Schwarz, Jaroslav ; Vodička, Petr ; Ondráček, Jakub ; Ždímal, Vladimír
As people spend most of their time indoors it’s important to understand how outdoor originating particulate can migrate indoors, their relative abundance indoors and how physico-chemical processes acting upon particulate can change the overall aerosol composition. Species volatility can complicate indoor data, change mass size distribution profiles, and implant artifacts on data measurements, enhancing uncertainty on results. This research describes the findings from high temporal resolution I/O, offline and online measurements, identifies outdoor aerosol loading dynamics and describes proportional compositions indoors relative to calculated I/O ratios.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22015102910281 - PDF
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Binary Nucleation H2SO4 in a Laminar Co-Flow Tube, Binary Nucleation H2SO4 in a Laminar Co-Flow Tube
Trávníčková, Tereza ; Havlica, Jaromír ; Škrabalová, Lenka ; Hrubý, Jan ; Ždímal, Vladimír
Nucleation of sulfuric acid with water is one of key processes during new particle formation in the atmosphere. Despite the fact that first experiments dealing with binary nucleation of H2SO4-H2O appeared in the seventies of the 20th century, its mechanism is still not fully understood. This is largely due to difficulties in specifying atmospheric conditions under which nucleation occurs and complexity of laboratory experiments. In studies on binary nucleation using flow chambers with turbulent mixing of components (most often used technique), the experimentalists face two major problems. They have to determine the position of the nucleation zone as accurately as possible, and, at the same time, define acid vapor concentration in the nucleation zone. In this paper we present a Laminar Co-Flow Tube a device for measuring of binary nucleation which overcomes both of these problems. First results on nucleaction rates obtained on this type of device show that it is a useful tool for studying binary nucleation.
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Plný tet: SKMBT_C22015102910280 - PDF
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Variability of Aerosols and Chemical Composition of PM10, PM2.5 and PM1 on the Platform of the Prague Underground Metro
Cusack, Michael ; Talbot, Nicholas ; Ondráček, Jakub ; Minguillon, M.-C. ; Schwarz, Jaroslav ; Otáhal, P. ; Klouda, K. ; Ždímal, Vladimír
The aim of this study is to describe aerosol concentrations and variability, and chemically characterise PM sampled during a 24 hour period on a platform of the Prague underground metro system. To this end, PM and particle number concentration and size distribution are described, and the chemical composition of PM in various size fractions is discussed, both for periods when the metro was out of operation and operational.
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22014102013562 - PDF
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