| 水泥窑除尘器捕集灰中PCDD/Fs、PCBs和PCNs的分布特征 |
| 摘要点击 2837 全文点击 1384 投稿时间：2008-03-22 修订日期：2008-06-10 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 多氯代二苯并二英和呋喃 多氯联苯 多氯萘 水泥窑 垃圾焚烧炉 除尘器捕集灰 分布 |
| 英文关键词 PCDD/Fs PCBs PCNs cement kilns waste incinerators fly ash patterns |
|
| 中文摘要 |
| 应用同位素稀释、高分辨气相色谱-质谱联用技术测定了国内3种类型水泥窑(机械立窑、湿法旋窑和新型干法旋窑)以及生活垃圾焚烧炉和医疗垃圾焚烧炉的除尘器捕集灰中PCDD/Fs、PCBs和PCNs的浓度和毒性当量，比较了同族体和同类物的分布特征.结果表明，水泥窑除尘器捕集灰中二英及其类似物PCDD/Fs、PCBs和PCNs的总毒性当量(以TEQ计)分别在4.0～62、 0.069～3.9和0.47～2.8 ng·kg-1之间，远小于垃圾焚烧炉除尘器捕集灰.占优势的PCDD/Fs同族体都是TCDFs，相对较多的2， 3， 7， 8位氯取代二英同类物有OCDD、 2，3，7，8-TCDF、 1，2，3，4，6，7，8-HpCDF；水泥窑除尘器捕集灰中PCBs同族体的分布特征与垃圾炉相似，占优势的同族体都是四氯联苯，含量较高的共平面PCBs同类物有PCB77、PCB105、PCB118；不同窑型水泥窑除尘器捕集灰中PCNs同族体分布特征相似，占优势的同族体都是四氯萘，没有检测到八氯萘的存在，含量较高的二英类毒性PCNs同类物是毒性最大的PCN 66/67. |
| 英文摘要 |
| The concentrations and toxic equivalent (TEQ) values of PCDD/Fs，PCBs and PCNs in fly ash collected from three types of cement kilns (vertical shaft kiln，wet-process rotary kiln and dry-process rotary kiln) and two types of waste incinerators were determined，and the patterns of homologues and congeners were compared.The results showed that the total TEQ of PCDD/Fs，PCBs and PCNs in cement kiln fly ash，which were in the range of 4.0-62， 0.069-3.9 and 0.47-2.8 ng·kg-1 respectively，were much lower than that of fly ash from waste incinerators.In cement kiln fly ash，the predominating PCDD/Fs homologues were TCDFs，and the chief 2， 3， 7， 8-PCDD/Fs congeners were OCDD， 2， 3， 7， 8-TCDF and 1， 2， 3， 4， 6， 7， 8-HpCDF.The patterns of PCBs homologues in cement kiln fly ash were similar to those of waste incinerators in which TeCB were predominating homologues.PCB77, PCB105, PCB118 were at higher concentrations than other co-polar PCBs.Different types of cement kiln fly ash presented similar PCNs homologue patterns.The predominant homologues were TeCN，whereas OcCN were not detected.PCN 66/67 which has dioxin like toxity was the most abundant congener in all fly ash. |
