Sampling methods and residential factors affecting formaldehyde concentration in indoor air
| Autor: | Yoko Endo, Kenji Fukunaga, Takeji Miyazaki, Ginji Endo, Michiyo Azuma, Hiroki Ikeda, Yoko Hikita |
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| Rok vydání: | 2002 |
| Předmět: |
Time Factors
Indoor air Statistics as Topic Air pollution Formaldehyde medicine.disease_cause General Biochemistry Genetics and Molecular Biology law.invention Peak concentration Toxicology chemistry.chemical_compound Japan law medicine Humans Air Conditioning Air Pollutants Chemistry Temperature Sampling (statistics) Humidity General Medicine Ventilation Air Pollution Indoor Ventilation (architecture) Window opening Passive sampling Environmental Monitoring |
| Zdroj: | The Tohoku journal of experimental medicine. 195(4) |
| ISSN: | 0040-8727 |
| Popis: | Formaldehyde (HCHO) is the most serious residential pollutant. In order to evaluate residential HCHO levels, two sampling methods have been recommended; one is a 30 minute sampling in a closed room, and the other is a 24 hour sampling with an ordinary lifestyle routine. The aim of this report was to clarify the difference between the HCHO levels obtained by the two sampling methods. Residential air in 58 rooms was sampled for 30 minutes by an active sampling method more than 5 hours after residents closed windows, and by a passive sampling method for 24 hours with an ordinary lifestyle routine. The HCHO concentration with the 30 minute sampling was 0.118+/-0.065 ppm (range: 0.034-0.295 ppm) and 36 rooms (62%) exceeded the Japanese guideline value of 0.08 ppm, while 5% were higher than 0.25 ppm. The HCHO concentration with the 24 hours sampling was 0.053+/-0.039 ppm (range: 0.02-0.167 ppm) and only 13 rooms (22%) exceeded 0.08 ppm. The relationship between the concentrations obtained by the two methods was linear. However, the level with the 24 hour sampling significantly reduced with prolonged window opening time, meaning that occupants made an effort to reduce the usual exposure to about 40% of the exposure in a closed room by opening windows in order to escape from irritation. Since major adverse effects of HCHO are irritation and sensitization, the occasional peak concentration must be focused. In order to evaluate residential HCHO levels, measurement in a closed room is recommended even if people are living there. |
| Databáze: | OpenAIRE |
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