生活垃圾焚烧飞灰中的二英分布及指示异构体的识别

对我国4座生活垃圾焚烧炉飞灰样品中的二英分析结果表明,二英的毒性当量范围为0.34～3.80 ng/g.二英异构体的分布具有相似性,其中1,2,3,7,8-PeCDD和2,3,4,7,8-PeCDF共占毒性当量的33.6%～40.5%.结合对某生活垃圾焚烧炉长期监测结果,同一焚烧炉不同时期飞灰样品的二英毒性当量与1,2,3,7,8-PeCDD和2,3,4,7,8-PeCDF贡献值具有很好的线性相关性（r分别为0.996 3和0.997 4）,1,2,3,7,8-PeCDD和2,3,4,7,8-PeCDF可作为指示异构体用于焚烧飞灰中二英毒性的快速测定,尤其适用于同一焚烧炉的长期监测,指示因子分别为4.466?4和3.164?6;不同焚烧炉飞灰的二英毒性当量与2,3,4,7,8-PeCDF有很好的线性相关性（r=0.984?9）,2,3,4,7,8-PeCDF可作为不同焚烧炉飞灰中二英检测的指示异构体,指示因子为3.419 4.

PCDD/Fs Distribution in MSWI Fly Ash and Identification of the Indicated Isomer

Four municipal solid waste incinerator (MSWI) fly ash samples were analyzed for PCDD/Fs. The toxicity equivalent quotient (TEQ) was 0.34~3.80ng/g. The congeners distribution presented great comparability to each other as 1,2,3,7,8-PeCDD and 2,3,4,7,8-PeCDF contributed about 33.6%~40.5% of total TEQ. Combination with the published PCDD/Fs results of the long-term monitoring in MSWI fly ash in Shanghai, it was found that total TEQ had good correlation with 1,2,3,7,8-PeCDD and 2,3,4,7,8-PeCDF contribution (r=0.9963 and 0.9974 respectively), so they could be considered as indicator isomers for the rapid determination of TEQ evaluation, especially in long-term monitoring of one incinerator. The indicator factors were 4.4664 and 3.1646 respectively. The analysis of the PCDD/Fs results from different incinerators also showed good correlation with 2,3,4,7,8-PeCDF contribution (r=0.9849) and it could be considered as indicator isomer for TEQ evaluation of MSWI fly ash samples. The indicator factor was 3.4194.