| Co-Investigator(Kenkyū-buntansha) |
MORIMURA Shigeru Kumamoto Univ., Graduate School of Science and Technology, Associate Prof., 工学部, 講師 (20230146)
FURUKAWA Kenji Kumamoto Univ., Civil Engineering and Architecture, Professor, 工学部, 教授 (60029296)
|
|---|
| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥3,100,000 (Direct Cost: ¥3,100,000)
|
|---|
| Research Abstract |
Preliminary studies involving labeled phenanthrene indicated that only anthracene in binary solubilizate systems had a significant influence on the solubilization of phenanthrene. Apart from this slight competition (inhibition) effect attributable to anthracene, it appeared that phenanthrene was unaware of the presence of naphthalene, pyrene or benzo (a) pyrene in solubilized form. In assays including the very hydrophilic 1-naphthol, enhancements in the solubilization of phenanthrene and pyrene in singular or mixed systems were evident.
Detailed experiments were conducted using a suite of four very hydrophobic hydrocarbons (HCs) fluorene (fl), phenanthrene (ph), fluoranthene (ft) and pyrene (py) to explore solubilization interactions in the micro-environment of the micelle. Fluorene was only significantly influenced by a competitive (inhibition) effect in assays including phenanthrene. For phenanthrene the results were reciprocal with fluorene ; i.e., inhibition in solubilization was ob
… More
served only in assays including fluorene. It would appear that these two HCs, bearing similar physical and thermodynamic properties, were to some degree competing for a similar locus in the micelle. Fluoranthene and pyrene, however, were both rather robust in their ability to avoid competitive effects. Despite this similarity, though, they did not influence each other (as fluorene and phenanthrene did). Molar (mole ratio) and volumetric (volume ratio) solubilization responses of total solubilized HC in multi-solubilizate systems all followed the same trends. Groupings of solubilization responses fell within four relatively vertical clusters. The first cluster was composed of systems with pyrene, fluoranthene and pyrene+fluoranthene, respectively from the origin. The second cluster consisted of those that had phenanthrene in common and the third, of those that had fluorene in common. Within the second and third clusters, the increasing trend of lesser magnitude reflected the presence of pyrene, fluoranthene and pyrene+fluoranthene (as in the first cluster). The fourth cluster was composed of all systems containing both fluorene and phenanthrene. Fluorene and phenanthrene were more significant in determining the magnitude of solubilization responses than were fluoranthene and pyrene. Also, with increasing number of HC species in a system, the total weight and/or volume of the solubilized HC increased. The outer limits of this trend followed a Langmurian pattern approaching a plateau of about 0.16 for Xm and 0.19 for MSR.In real remedial scenarios where contaminants consist of numerous HC species, this observation could be of significance for predicting solubilization responses. Less
|
