Title: Penetration of naphthalene, n-hexadecane, and 2,4-dinitrotoluene into southern yellow pine under conditions modeling spills and floods
Author: Popova, I.E.; Beklemishev, M.K.; Frihart, C.R.; Seames, W.S.; Sundstrom, T.J.; Kozliak, E.I.;
Source: Forest products journal. Vol. 56, no. 6 (June 2006): pages 68-75.
Publication Series: Miscellaneous Publication
Description: This paper investigates the penetration of three common contaminants into building grade southern yellow pine wood samples under the conditions experienced during chemical spills. Contaminants (n-hexadecane, naphthalene, and 2,4-dinitrotoluene) were applied in their 14C-labeled forms to 5-to 9-cm-long pieces of southern yellow pine at ambient conditions. The impact of the following parameters on diffusivity was investigated: contaminant volatility and solubility in water, penetration direction compared to wood grain structure, and water saturation of wood under conditions characteristic of catastrophic floods. Water saturation (having a dramatic effect on diffusion rates) was studied under three conditions: wood pieces with ambient water concentration, those “post-soaked” with water after contamination, and those pre-soaked with water before contamination. Contaminant diffusivities in the ambient samples increased with increased contaminant volatility. For more water-soluble compounds. naphthalene and 2,4-dinitrotoluene, the diffusion rate was greater in post-soaked samples with diffusivities approaching 10-9 m2/s, characteristic for their diffusion in bulk liquids. By contrast, n-hexadecane diffusion was hindered significantly in post-soaked samples. For all three contaminants, longitudinal and tangential penetration rates were similar, indicating that the rate-limiting step may be contaminant evaporation inside the wood tracheids or contaminant dissolution in water (diffusion being controlled by strong contaminant sorption in wood). Experiments with pre-soaked samples and those conducted under external capillary pressure showed different trends from non-pressurized post-soaked samples, indicating a possible switch in the rate-limiting steps for contaminant diffusion under these conditions.
Keywords: Solubility, adsorption, absorption, water pollution, naphthalene, dinitrotoluenes, chemical spills, pollution, penetration, floods, tracheids, N-hexadecane, southern yellow pine
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Popova, I.E.; Beklemishev, M.K.; Frihart, C.R.; Seames, W.S.; Sundstrom, T.J.; Kozliak, E.I. 2006. Penetration of naphthalene, n-hexadecane, and 2,4-dinitrotoluene into southern yellow pine under conditions modeling spills and floods. Forest products journal. Vol. 56, no. 6 (June 2006): pages 68-75.
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