A Global Mass Balance for Chlorinated Dioxins and Dibenzofurans

9321274这个奖项的目的是获得比目前更全面的关于氯化二苯并对二恶英污染物的主要来源的知识，这些污染物包括空气、水和土壤。迄今为止，根据对空气、沉积物和土壤的分析估计的这些化合物的全球沉降量大大高于通过已知来源排放总量确定的可能沉淀量。调查员计划通过对土壤和沉积物样品进行全球采集、对这些样品进行分析并确定其在建立比目前已知的更好的质量平衡方面的重要性来解决这方面的差异，即已知来源的沉积与土壤和沉积物中这些化合物的存在之间的差异。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，以此作为消除或减少湖泊、土壤和植被中存在的多氯二苯并对二恶英和二苯并呋喃的步骤。该项目的预期结果是更好地了解这些化合物的存在、分散和通量，以此作为确定需要对其来源进行额外控制的程度的一步。预计这将为减少或消除向大气排放这些化合物的进程提供任何改进的基础。***

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. ***