A Global Mass Balance for Chlorinated Dioxins and Dibenzofurans

氯化二恶英和二苯并呋喃的全球质量平衡

• 批准号: 9321274
• 负责人: Ronald Hites
• 金额: $ 28.7万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-15 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9321274&HistoricalAwards=false
• 关键词: Global; Mass; Balance; Chlorinated; Dioxins

9321274 Hites The objective of this award is to obtain more comprehensive knowledge than is now available regarding the major sources of chlorinated dibenzo-p-dioxin contaminants of air, water and soil. The global deposition of these compounds that has been estimated to date from analyses of air, sediment and soil is significantly higher than has been determined to be possible by summation of discharges from known sources. The investigator plans on resolving the disparity in this respect by global collection of samples of soil and sediment, analysis of these samples and determination of their significance in establishing a better mass balance than is now known regarding the disparity between deposition from known sources and the presence of these compounds in soil and sediments. Considerable effort is now being made to displace the use of many useful chlorinated chemical compounds from use as a step toward removing or reducing the presence of polychlorinated dibenzo-p- dioxins and dibenzofurans from lakes, soils and vegetation. The expected result of this project is better knowledge regarding the presence, dispersion and flux of these compounds as a step toward determining the extent to which additional control over their sources is necessary. This in turn is expected to provide the basis for any improvements in processes for reducing or eliminating the emission of these compounds into the atmosphere. ***

9321274 Hites该奖项的目的是获得比现在更全面的关于空气、水和土壤中氯代二苯并对二恶英污染物主要来源的知识。 迄今为止，根据对空气、沉积物和土壤的分析估计，这些化合物的全球沉积量大大高于通过已知来源排放量总和确定的可能沉积量。 调查人员计划解决这方面的差异，办法是在全球范围内收集土壤和沉积物样本，分析这些样本，并确定它们在建立比目前已知的更好的质量平衡方面的重要性，即已知来源的沉积物与土壤和沉积物中存在的这些化合物之间的差异。 目前正在作出相当大的努力，以取代许多有用的氯化化合物的使用，作为从湖泊、土壤和植被中清除或减少多氯二苯并对二恶英和二苯并呋喃的一个步骤。 这一项目的预期结果是更好地了解这些化合物的存在、分散和流动情况，作为确定在多大程度上需要对其来源进行额外控制的一个步骤。 这反过来有望为减少或消除这些化合物向大气中排放的工艺的任何改进提供基础。 ***