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Recovery and photodecomposition of PCBs and dioxins.

PCB 和二恶英的回收和光分解。

基本信息

批准号：
03044089
负责人：
TANAKA Nobuo
金额：
$ 3.2万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

In our joint research project, "Recovery and photodecomposition of PCBs and dioxins", under the Monbusho International Scientific Research Program (No.03044089), the following three subjects have been investigated.(1) Recovery of PCBs and dioxins existing in aqueous environment by adsorption onto hydrophobic solid surface, followed by photodecomposition.Tetrachlorodibenzo-p-dioxins in aqueous alcohol at ppm level was completely trapped onto the surface of alkylated silica particles in a quartz tube. UV irradiation (15 min) or sunlight irradiation (4 days) effected complete photodecomposition of the dioxin to form chlorophenols and catechols.(2) Separation of polychlorodibenzo-p-dioxins Coproduced during preparation and the structure assignment.All the 75 chlorodioxin congeners were completely separated by using electron-donor (pyrene)-bonded and electron-acceptor (nitrobenzene)-bonded silica packings for the first time. In addition, structure assignment was made for the isomers that have never been isolated by the existing methods.(3) Sample treatment method for the GC/MS determination of blood levels of PCBs, dioxins, and benzpyrene utilizing restricted-access reversed-phase packings.The packings having internal surfaces with high hydrophobicity were prepared, and applied to the separation of the environmental contaminants from serum proteins. The sample preparation time can be shortened from several days to less than one hour by this method.The results obtained in this joint research program are expected to contribute to the improvement of the environment and better assessment of environmental risks associated with the chlorinated aromatic compounds.

我们在文部省国际科学研究计划（No.03044089）下的联合研究项目“多氯联苯和二恶英的回收和光分解”中，研究了以下三个课题。（1）通过吸附到疏水性固体表面上，然后进行光分解来回收水环境中存在的多氯联苯和二恶英。酒精水溶液中的四氯二苯并二恶英浓度为 ppm 水平被完全捕获在石英管中的烷基化二氧化硅颗粒的表面上。紫外线照射（15分钟）或阳光照射（4天）使二恶英完全光分解，形成氯酚和儿茶酚。（2）多氯二苯并-对-二恶英的分离在制备和结构归属过程中同时产生。通过使用电子给体（芘）键合和结构鉴定，将所有75种氯二恶英同系物完全分离。首次采用电子受体（硝基苯）键合二氧化硅填料。此外，还对现有方法从未分离过的异构体进行了结构归属。(3)利用限制进入反相填料GC/MS测定血液中PCBs、二恶英和苯并芘含量的样品处理方法。制备了内表面具有高疏水性的填料，并将其应用于环境污染物与血清蛋白的分离。通过这种方法，样品制备时间可以从几天缩短到不到一小时。该联合研究项目获得的结果预计将有助于改善环境和更好地评估与氯化芳香族化合物相关的环境风险。