Organic phase resistance to dissolution of polycyclic aromatic hydrocarbon compounds
Organic phase resistance to dissolution of polycyclic aromatic hydrocarbon compounds
复制标题
有机相耐多环芳烃化合物溶解
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
R. Luthy
中科院分区：
文献类型：
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作者：
E. Ortiz;M. Kraatz;R. Luthy
在连续流系统中研究了萘、菲和芘从粘性有机相溶解到水中的情况，持续时间从几个月到一年多。通过选择从低粘度到半固体的非水相，即从轻质润滑油到石蜡，传质控制显示出从水相控制到非水相控制的不同。提出了先进的贫化区模型来解释多环芳烃从粘性有机相中的溶解，其中有机相内贫化区的形成增加了有机相对多环芳烃溶解的阻力。实验数据表明，对于包含高粘度油、矿脂（凡士林）和石蜡的系统，在有机相内形成贫化区。冲洗几天后，有机相对萘溶解的耐受性变得比对水相的耐受性占主导地位。对于低粘度润滑油来说，这种影响并不明显。从水相溶解控制到非水相溶解控制的转变似乎是可预测的，这为评估粘性非水相液体和半固体中 HOC 的长期释放提供了更合理的框架。
The dissolution of naphthalene, phenanthrene, and pyrene from viscous organic phases into water was studied in continuous-flow systems for time periods ranging from several months to more than 1 year. By selecting nonaqueous phases ranging from low viscosity to semisolid, i.e., from a light lubricating oil to paraffin, the governance of mass transfer was shown to vary from water phase control to nonaqueous phase control. An advancing depleted-zone model is proposed to explain the dissolution of PAHs from a viscous organic phase wherein the formation of a depleted zone within the organic phase increases the organic phase resistance to the dissolution of PAHs. The experimental data suggest the formation of a depleted zone within the organic phase for systems comprising a high-viscosity oil, petrolatum (petroleum jelly), and paraffin. Organic phase resistance to naphthalene dissolution became dominant over aqueous phase resistance after flushing for several days. Such effects were not evident for low viscosity lubricating oil. The transition from aqueous-phase dissolution control to nonaqueous-phase dissolution control appears predictable, and this provides a more rational framework to assess long-term release of HOCs from viscous nonaqueous phase liquids and semisolids.