Journal of Environmental Engineering (Transactions of AIJ)
Online ISSN : 1881-817X
Print ISSN : 1348-0685
ISSN-L : 1348-0685
EXPERIMENTAL STUDY FOR 2-ETHYL-1-HEXANOL EMISSION CHARACTERISTICS FROM FLOORING MATERIALS ON VARIOUS HUMIDITY CONDITIONS
Naoki KAGIKenichi AZUMAHoon KIMU YANAGIKenichi HASEGAWA
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2020 Volume 85 Issue 777 Pages 811-817

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Abstract

 The emission mechanisms for 2-ethyl-1-hexanol (2E1H) are not only the primary emission that directly generates from materials but also the secondary emission from material that contains di (2-ethylhexyl) phthalate (DEHP) in PVC floor using with various adhesives and self-leveling sub-floor material that contains water with high pH. Many previous studies showed that the secondary emission for 2E1H is the main emission source in the indoor environments that use concreate and PVC flooring materials. However, there are some cases where the 2E1H concentration are high even in a room that is not constructed with concrete and PVC flooring materials.

 This study carried out the field measurements of airborne 2E1H and the 2E1H emission tests for PVC sheets, carpets and adhesives on various humidity conditions by using the small chamber method for focusing on the emission behavior of 2E1H due to moisture supplied to flooring materials from the air and base material. The airborne 2E1H with humidifiers in the room and wiping of the materials were also measured to investigate the characteristics of indoor concentration.

 From the results of the field measurements, 2E1H was detected in all office rooms in this study, and the 2E1H concentrations of the room B and H were higher than 130 µg/m3. Since the high concentration of 2E1H was detected even in the room where no PVC flooring material was directly applied to the concrete, the primary emission also contributed to the increase of the indoor 2E1H concentration.

 From the emission test from the PVC sheet, tile carpet, adhesives and composite material on the various water conditions, it was confirmed that the 2E1H emission rates for PVC sheet and adhesive were increased due to the moisture from the base material and the water vapor in the air. It was found that moisture of the materials and humidification in the air increased the primary emission of 2E1H from building materials.

 From real-scale experiments, it was shown that 2E1H emissions from PVC building materials increased due to humidification and increased water content of building materials. The water content of the building material and 2E1H emission did not change even if the materials were wiping for adding water.

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© 2020 Architectural Institute of Japan
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