Studies on the dissolution of polycyclic aromatic hydrocarbons from contaminated materials using a novel dialysis tubing experimental method
Studies on the dissolution of polycyclic aromatic hydrocarbons from contaminated materials using a novel dialysis tubing experimental method
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使用新型透析管实验方法研究污染材料中多环芳烃的溶解
DOI：
10.1021/es980638z
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发表时间：
1999
影响因子：
11.4
通讯作者：
K. Jones
中科院分区：
文献类型：
--
作者：
Paula J. Woolgar;K. Jones
对污染场地的风险和补救战略进行评估，需要对污染物的存在量及其从材料和土壤中释放的潜力进行评估。因此，研究了多环芳烃（PAHs）从受污染材料向水中的释放或溶解。为了方便调查的PAH溶解从物理上不同的材料，如固体煤焦油，杂酚油，石油，和废氧化物，测量溶解的多环芳烃的实验方法开发采用透析管在一个间歇式系统。这是验证和比较水相多环芳烃浓度测量使用更传统的技术，也预测使用拉乌尔定律。实验过程被成功地用于确定“近平衡”的多环芳烃的水溶液浓度，但它只能被用来确定相对速率接近平衡的透析管影响的速率常数。结果发现，污染物影响溶解，特别是接近平衡浓度。对于化学性质类似于多环芳烃的物质，如非水相液体（NAPLs），其浓度可以使用拉乌尔定律进行预测。对于化学性质与多环芳烃不同的材料，如废氧化物，释放比NAPLs更有利。
Assessment of risk and remediation strategies at contaminated sites requires that both the amounts of contaminants present and their potential for release from materials and soils be evaluated. The release, or dissolution, of polycyclic aromatic hydrocarbons (PAHs) from contaminated materials to water was therefore investigated. To facilitate investigations of PAH dissolution from physically disparate materials such as solid coal tars, creosote, oil, and spent oxide, an experimental method for measuring dissolved PAHs was developed employing dialysis tubing in a batch-type system. This was validated and compared to aqueous-phase PAH concentrations measured using more traditional techniques and also predicted using Raoult's law. The experimental procedure was successfully used to determine ‘near equilibrium' aqueous concentrations of PAHs, but it could only be used to determine relative rates of approach to equilibrium as the dialysis tubing effected the rate constants. It was found that the contaminant materials influenced dissolution, in particular the close to equilibrium concentrations. For materials chemically similar to PAHs, such as nonaqueous-phase liquids (NAPLs), the concentrations could be predicted using Raoult's law. For materials that were chemically dissimilar to PAHs, such as spent oxide, release was more thermodynamically favorable than for NAPLs.