【摘要】 目的:以甲醇中BDE209为研究对象探讨多溴二苯醚脱溴降解过程与机理.方法:采取GC-MS现做现测不同UV波长、不同浓度和不同p H条件对BDE209降解的影响.结果:UV-C体系降解速率是UV-A体系的1.25倍.不同p H值下降解动力学系数为-0.056μg/min.BDE209半衰期为7 min左右.nona BDE最高值在7 min与Deca BDE的反应半衰期一致.同分异构体间浓度差异大,octa BDE中BDE203最大浓度是BDE197的2.50倍.结论:BDE209代谢符合准一级动力学原理,其脱溴过程是从髙溴到低溴逐步脱溴.更多还原

【Abstract】 Aim: The mechanism of debromination of Polybrominated Diphenyl Ethers was explored in the present study, using decabromodiphenyl ether( BDE209) as the object for debromination in methanol. Methods: The effects of UV wavelength,concentration and PH on degradation of BDE209 were analyzed. To advance the responsibility,all samples were tested by GC-MS during debromination.Results: The debromination speed under UV-C was 1. 25 times that for UV-A. The kinetic coefficient of debrominaition was-0. 056 μg/min even in different PHs. The half-life of Deca BDE was about 7 min,same as the highest level of that of nona BDE. The concentration of isomers variedgreatly. As for octa BDE,the max concentration of BDE203 was 2. 5 times that of BDE197. Conclusion: Debromination of BDE209 was complied with the pseudo-first-order characteristics,and it was gradually degraded from high to low in amount of Br atom.更多还原