武汉郊区陆生鹊鸟中卤代有机污染物污染特征研究

Pollution characterization of organohalogen contamination in common magpie from suburban of Wuhan City

采集武汉郊区9只喜鹊,分析喜鹊肌肉中的卤代有机污染物,如滴滴涕、多氯联苯、多溴联苯醚、十溴二苯乙烷、得克隆及六溴环十二烷的含量.分析结果表明DDTs、PCBs、PBDEs、DBDPE、DPs和HBCDs的脂肪归一化浓度范围分别为610-15 000 ng/g、25-500 ng/g、12-2 900 ng/g、0.18-820 ng/g、1.7-15 ng/g和nd（低于检测限）-14 ng/g.DDTs仍是主要的污染物,占总卤代有机污染物的90%以上;其次为PCB和PBDEs.这一结果表明有机氯农药、多氯联苯等这些传统的持久性有机污染物仍是采样区域的主要污染物.但新型污染物如DBDPE的污染也应引起重视.PCBs主要以高氯代单体为主,显示其污染源主要来自高氯代PCB工业品.PBDE存在两种明显不同的组成模式,可能与鸟采食区域和食物来源有关.DPs显示出一定的反式富集特征,这与水鸟的顺式富集特点完全不同.

Total nine common magpies（Pica pica） were collected from suburban of Wuhan City inSeptember 2010 and organohalogen contaminations including dichlorodiphenyl trichloroethane and itsmetabolites（DDTs）, polychlorinated biphenyls（PCBs）, polybrominated diphenyl ethers（PBDEs）,decabromodiphenylethane（DBDPE）,dechlorane plus（DPs） and hexabromocyclododecanes（HBCDs） weredetermined.The concentrations of DDTs、PCBs、PBDEs、DBDPE、DPs and HBCD ranged from 610 15 000 ng/g、25 500 ng/g、12 2 900 ng/g、0.18 820 ng/g、1.7 15 ng/g and nd 14 ng/g lipid,respectively. DDTs werethe predominant pollutant accounting for more than 90% of total organohalogen congaminations,followed byPCBs and PBDEs. This result indicated that organochlorine pesticides,polychlorinated biphenyls etc,theselegacy contaminants were still the main environmental concerns in the study area. However,more attentionshould be pay for the pollution of DBDPE. Highly chlorinated PCBs technical mixture might be the main sourceof PCBs in the study area. Two PBDE congener profiles were observed in the common magpie,which could beattributed to different diet source of common magpie. A selective accumulation of anti- DPs was found incommon magpie,which was different from that in aquatic birds.