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：这项提议的长期目标是开发一种 半挥发性有机污染物释放的定量预测方法 通过附近溪流的危险废物场所产生的污染物。要对 这类化学物质在溪水和静止河床之间的交换 沉积物。建议测量超额Th234的渗透率 和Pb210进入河床将揭示沉积物的深度 它在几周的时间尺度上与上覆的水流接触 (Th234)，并在几十年内积累(Pb210)。把这个结合起来 了解有毒有机物质的吸附和扩散行为 化学品将使模拟床流交换成为可能。通过执行 某一特定水系(东部)的质量平衡系列研究 排水沟/阿伯乔纳河通过沃本的两个超级基金地点， Ma)，研究人员希望看到化学降解 在短期内关闭质量平衡的过程是必要的。 不同河段和不同地点的实地考察 这些监测包括：(A)季节性监测；(B)分几年进行的较长期监测。 对于特定的半挥发物，是否需要“汇”来解释 现场数据，他们将在一条河流上应用一些“探测”化合物 为某些光化学物质(例如，2，5- 二甲基呋喃用于评估瞬时氧化剂Singlet的丰度 氧气)和生化过程(例如，评估微生物的甲苯 氧化酶活性)。