Main Title |
Sorption and Reemission of Formaldehyde by Gypsum Wallboard. |
Author |
Chang, J. C. S. ;
|
CORP Author |
Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab. |
Publisher |
1993 |
Year Published |
1993 |
Report Number |
EPA/600/A-93/078; |
Stock Number |
PB93-180917 |
Additional Subjects |
Formaldehyde ;
Indoor air pollution ;
Sorption ;
Desorption ;
Mathematical models ;
Mass transfer ;
Wallboard ;
Construction materials ;
Buildings ;
Gypsum ;
Insulation ;
Study estimates ;
Comparison ;
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB93-180917 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
25p |
Abstract |
The paper gives results of an analysis of the sorption and desorption of formaldehyde by unpainted wallboard, using a mass transfer model based on the Langmuir sorption isotherm. The sorption and desorption rate constants are determined by short-term experimental data. Long-term sorption and desorption curves are developed by the mass transfer model without any adjustable parameters. Compared with other empirically developed models, the mass transfer model has more extensive applicability and provides an elucidation of the sorption and desorption mechanism that empirical models cannot. The mass transfer model is also more feasible and accurate than empirical models for applications such as scale-up and exposure assessment. For a typical indoor environment, the model predicts that gypsum wallboard is a much stronger sink for formaldehyde than for other indoor air pollutants such as tetrachloroethylene and ethylbenzene. The strong sink effects are reflected by the high equilibrium capacity and slow decay of the desorption curve. |
Supplementary Notes |
See also PB88-251657 and DE86012632. Presented at the ASHRAE IAQ '92 Conference, San Francisco, CA., October 18-21, 1992. |
NTIS Title Notes |
Rept. for Jun 90-Aug 92. |
Category Codes |
68A; 89G |
NTIS Prices |
PC A03/MF A01 |
Primary Description |
600/13 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
317523621 |
Origin |
NTIS |
Type |
CAT |