SEMIVOLATILE ORGANIC COMPOUNDS DISCHARGED TO SURFACE DRAINAGE SYSTEMS/SUPERFUND

半挥发性有机化合物排放至地表排水系统/超级基金

• 批准号: 3733680
• 负责人: PHILIP M GSCHWEND
• 金额: --
• 依托单位: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3733680
• 关键词: adsorption; amorphous solid; biotransformation; diffusion; environmental toxicology; environmental transport; fresh water environment; gas chromatography; ground water; hydropathy; industrial waste; mathematical model; organic chemicals; soil; solute; thermodynamics; toluene; toxicant interaction; trichloroethylene; water pollution; water solubility

Description: The long term objective of this proposal is to develop a quantitative means for predicting the delivery of semivolatile organic contaminants from hazardous waste sites via nearby streams. To model the exchange of such chemicals between the stream water and the immobile bed sediments. It is proposed that measuring the penetration of excess Th234 and Pb210 into the bed of a stream will reveal the depth of sediment which is in contact with the overlying flow on time scales of weeks (Th234) and which is accumulating over decades (Pb210). Coupling this knowledge with the sorption and diffusion behavior of toxic organic chemicals will enable modeling bedstream exchange. By performing a series of mass balance studies on a particular stream system (the East Drainage Ditch/Aberjona River passing two Superfund Sites in Woburn, MA), the researchers expect to see whether chemical degradation processes are necessary to close the mass balances for (a) short term field studies at different stream reaches and occurring at different seasons, and (b) a longer term monitoring spread over several years. Should "sinks" be needed for particular semivolatiles to explain the field data, they will apply some "probe" compounds to the stream in an effort to calibrate that site for certain photochemical (e.g., 2,5- dimethyl furan to assess the abundance of the transient oxidant, singlet oxygen) and biochemical processes (e.g., toluene to assess microbial oxidase activity).

说明：本提案的长期目标是制定一项 预测半挥发性有机物释放的定量方法 污染物从危险废物场通过附近的溪流。建模 这些化学物质在溪流水和固定床之间的交换 沉积物建议测量过量Th 234的穿透性 和Pb 210进入河床将揭示沉积物的深度 其与上覆流在数周的时间尺度上接触 （Th 234），并积累了几十年（Pb 210）。联接该 有毒有机物的吸附和扩散行为的知识 化学品将能够模拟床流交换。通过执行 对一个特定的河流系统（东部）进行了一系列质量平衡研究 排水沟/Aberjona河经过Woburn的两个超级基金场地， 研究人员希望看到化学降解是否 有必要进行一些过程，以在（a）短期内关闭质量平衡 在不同河段进行实地研究， 季节，和（B）一个较长期的监测跨越几年。 对于特定的半挥发物，是否需要“汇”来解释 现场数据，他们将应用一些“探针”化合物流在一个 为某些光化学（例如，2,5- 二甲基呋喃，以评估瞬态氧化剂的丰度，单线态 氧）和生化过程（例如，甲苯以评估微生物 氧化酶活性）。