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: 6239441
• 负责人: PHILIP M GSCHWEND
• 金额: $ 17.51万
• 依托单位: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
• 依托单位国家: 美国
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-01 至 1998-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6239441
• 关键词: adsorption; amorphous solid; biotransformation; diffusion; environmental toxicology; environmental transport; fresh water environment; gas chromatography; ground water; hazardous substances; 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).

描述：该提案的长期目标是开发一个 预测半挥发性有机物输送的定量方法 通过附近的溪流来自危险废物场的污染物。建模 溪流水和固定床之间此类化学物质的交换 沉积物。建议测量过量Th234的渗透 和 Pb210 进入溪流河床将揭示沉积物的深度 它与上覆水流在几周的时间尺度上接触 (Th234) 以及几十年来不断积累的 (Pb210)。耦合这个 有毒有机物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 对特定河流系统（东部 排水沟/阿伯霍纳河穿过沃本的两个超级基金站点， MA），研究人员希望了解化学降解是否 需要采取一些流程来关闭 (a) 短期内的质量平衡 在不同的河段和不同的地点进行实地研究 季节，以及 (b) 持续数年的长期监测。 特定半挥发物是否需要“下沉”来解释 现场数据，他们将应用一些“探测”化合物到流中 努力校准该位点的某些光化学（例如，2,5- 二甲基呋喃评估瞬时氧化剂单线态的丰度 氧）和生化过程（例如，用于评估微生物的甲苯） 氧化酶活性）。