Science Inventory

Determination of partition and diffusion coefficient of formaldehyde in selected building materials and impact of relative humidity

Citation:

Xu, J., J. S. Zhang, AND X. LIU. Determination of partition and diffusion coefficient of formaldehyde in selected building materials and impact of relative humidity. In Proceedings, Indoor Air 2011, Austin, TX, June 05 - 10, 2011. International Society of Indoor Air Quality and Climate (ISIAQ), Santa Cruz, CA, 7 p, (2011).

Impact/Purpose:

conference paper

Description:

The partition and effective diffusion coefficients of formaldehyde were measured for three materials (conventional gypsum wallboard, "green" gypsum wallboard, and "green" carpet) under three relative humidity (RH) conditions (20%, 50% and 70% RH). A dynamic dual-chamber test method was used. Results showed that a higher relative humidity led to a larger effective diffusion coefficient for both conventional wallboard and green wallboard. The partition coefficient (Kma) of formaldehyde in conventional wallboard was larger at 50% RH than at 20% RH, while the difference in Kma between 50% RH and 70% RH was insignificant. For the green wallboard and green carpet, the partition coefficient increased slightly with the increase of relative humidity from 20% to 50% and then to 70%. The carpet was also found to be very permeable resulting in a diffusion coefficient at the same level as the formaldehyde diffusion coefficient in air. The data generated could be used to assess the sorption effects of formaldehyde on building materials and to evaluate its impact on the formaldehyde concentration in buildings.

URLs/Downloads:

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Record Details:

Record Type: DOCUMENT (PAPER IN NON-EPA PROCEEDINGS)
Product Published Date: 06/05/2011
Record Last Revised: 06/09/2011
OMB Category: Other
Record ID: 231737

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

AIR POLLUTION PREVENTION AND CONTROL DIVISION

INDOOR ENVIRONMENT MANAGEMENT BRANCH