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Thiele V, Monsé C, Hoffmeyer F, Brüning T, Bünger J, Sucker K. Indoor Air Quality-An Overview of Methods for Measuring Odor Detection Thresholds of Single Substances. Respir Physiol Neurobiol 2023:104108. [PMID: 37393967 DOI: 10.1016/j.resp.2023.104108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 06/26/2023] [Accepted: 06/29/2023] [Indexed: 07/04/2023]
Abstract
Odor evaluation is an important topic in the field of indoor air quality. Odor detection threshold (ODT) values are used to derive limit values like odor guide values or odor activity value. However, ODT values for the same substance available in compilations or published before 2003 rarely have an accuracy of less than three orders of magnitude. Stimulus preparation, including analytical verification, stimulus presentation, as well as selection and training of test subjects have been identified as major sources of variability. ODT values obtained by validated standardized methods are now considered objective, reliable, and reproducible. They exhibit a variability of one or two orders of magnitude and are lower than traditionally assumed and reported. This review presents the essential criteria for a well-performed ODT determination. It is intended to assist health and safety professionals in assessing whether the methodological approach of a study was appropriate for determining a valid and reliable ODT value.
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Affiliation(s)
- Vanessa Thiele
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, Germany
| | - Christinan Monsé
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, Germany
| | - Frank Hoffmeyer
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, Germany
| | - Thomas Brüning
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, Germany
| | - Jürgen Bünger
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, Germany
| | - Kirsten Sucker
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, Germany.
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Noël F, Serra CA, Le Calvé S. Design of a Novel Axial Gas Pulses Micromixer and Simulations of its Mixing Abilities via Computational Fluid Dynamics. MICROMACHINES 2019; 10:mi10030205. [PMID: 30909558 PMCID: PMC6471047 DOI: 10.3390/mi10030205] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 03/13/2019] [Accepted: 03/19/2019] [Indexed: 11/16/2022]
Abstract
Following the fast development of microfluidics over the last decade, the need for methods for mixing two gases in flow at an overall flow rate ranging from 1 to 100 NmL·min−1 with programmable mixing ratios has been quickly increasing in many fields of application, especially in the calibration of analytical devices such as air pollution sensors. This work investigates numerically the mixing of pure gas pulses at flow rates in the range 1–100 NmL·min−1 in a newly designed multi-stage and modular micromixer composed of 4 buffer tanks of 300 µL each per stage. Results indicate that, for a 1 s pulse of pure gas (formaldehyde) followed by a 9 s pulse of pure carrier gas (air), that is a pulses ratio of 1/10, an effective mixing up to 94–96% can be readily obtained at the exit of the micromixer. This is achieved in less than 20 s for any flow rate ranging from 1 to 100 NmL·min−1 simply by adjusting the number of stages, 1 to 16 respectively. By using an already diluted gas bottle containing 100 ppm of a given compound in an inert gas same as the carrier gas, concentrations ranging from 10 to 90 ppm should be obtained by adjusting the pulses ratio between 1/10 and 9/10 respectively.
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Affiliation(s)
- Florian Noël
- ICPEES UMR 7515, Université de Strasbourg/CNRS, F-67000 Strasbourg, France.
- In'Air Solutions, 25 rue Becquerel, 67087 Strasbourg, France.
- Institut Charles Sadron (ICS) UPR 22, Université de Strasbourg/CNRS, F-67000 Strasbourg, France.
| | - Christophe A Serra
- Institut Charles Sadron (ICS) UPR 22, Université de Strasbourg/CNRS, F-67000 Strasbourg, France.
| | - Stéphane Le Calvé
- ICPEES UMR 7515, Université de Strasbourg/CNRS, F-67000 Strasbourg, France.
- In'Air Solutions, 25 rue Becquerel, 67087 Strasbourg, France.
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The Influence of Humidity on Assessing Irritation Threshold of Ammonia. BIOMED RESEARCH INTERNATIONAL 2016; 2016:6015761. [PMID: 27379250 PMCID: PMC4917677 DOI: 10.1155/2016/6015761] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 05/20/2016] [Accepted: 05/22/2016] [Indexed: 02/06/2023]
Abstract
A large number of occupational exposure limit values (OELs) are based on avoiding of sensory irritation of the eyes and the upper respiratory tract. In order to investigate the chemosensory effect range of a chemical, odor and sensory irritation thresholds (lateralization thresholds, LTs) can be assessed. Humidity affects olfactory function and thus influences odor thresholds; however, a similar effect has not been shown for sensory irritation thresholds. The purpose of the present study was to explore whether LTs for ammonia vapor vary depending on the water vapor content of the inspired stimulus. Eight healthy nonsmoking volunteers were simultaneously exposed to ammonia vapor through one nostril and clean air through the other and were asked to determine which nostril received the chemical. Within experimental runs, ascending ammonia concentrations (60–350 ppm) that were either dry or humidified were administered at fixed time intervals. Geometric mean LTs obtained at wet (181 ppm) or dry (172 ppm) conditions did not differ significantly (P = 0.19) and were within the range of those reported by previous studies. These results suggest that humidity is not a critical factor in determining sensory irritation thresholds for ammonia, and future studies will examine if these findings are transferable to sensory irritation thresholds for other chemicals.
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Lewkowska P, Dymerski T, Gębicki J, Namieśnik J. The Use of Sensory Analysis Techniques to Assess the Quality of Indoor Air. Crit Rev Anal Chem 2016; 47:37-50. [PMID: 27105173 DOI: 10.1080/10408347.2016.1176888] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The quality of indoor air is one of the significant elements that influences people's well-being and health inside buildings. Emissions of pollutants, which may cause odor nuisance, are the main reason for people's complaints regarding the quality of indoor air. As a result, it is necessary to perform tests aimed at identifying the sources of odors inside buildings. The article contains basic information on the characteristics of the sources of indoor air pollution and the influence of the odor detection threshold on people's health and comfort. An attempt was also made to classify and use sensory analysis techniques to perform tests of the quality of indoor air, which would enable identification of sensory experience and would allow for indication of the degree of their intensity.
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Affiliation(s)
- Paulina Lewkowska
- a Faculty of Chemistry, Department of Analytical Chemistry , Gdansk University of Technology , Gdansk , Poland
| | - Tomasz Dymerski
- a Faculty of Chemistry, Department of Analytical Chemistry , Gdansk University of Technology , Gdansk , Poland
| | - Jacek Gębicki
- a Faculty of Chemistry, Department of Analytical Chemistry , Gdansk University of Technology , Gdansk , Poland
| | - Jacek Namieśnik
- a Faculty of Chemistry, Department of Analytical Chemistry , Gdansk University of Technology , Gdansk , Poland
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Monsé C, Sucker K, van Thriel C, Broding HC, Jettkant B, Berresheim H, Wiethege T, Käfferlein H, Merget R, Bünger J, Brüning T. Considerations for the design and technical setup of a human whole-body exposure chamber. Inhal Toxicol 2012; 24:99-108. [DOI: 10.3109/08958378.2011.640362] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Christian Monsé
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
| | - Kirsten Sucker
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
| | - Christoph van Thriel
- Leibnitz Research Centre for Working Environment and Human Factors (IfADo), Ardeystraße,
Dortmund, Germany
| | - Horst Christoph Broding
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
| | - Birger Jettkant
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
| | - Hans Berresheim
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
| | - Thorsten Wiethege
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
| | - Heiko Käfferlein
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
| | - Rolf Merget
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
| | - Jürgen Bünger
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
| | - Thomas Brüning
- Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA),
Bürkle-de-la-Camp-Platz, Bochum, Germany
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