摘要
初步研究了四川省卧龙地区5个不同海拔高度的表层土壤和2个牦牛样品中二噁英/呋喃(PCDD/Fs)、共平面多氯联苯(co-PCBs)和多氯萘(PCNs)的分布特征、来源、毒性当量以及生态风险状况.土壤样品中总2,3,7,8-PCDD/Fs的含量范围为2.48—4.30 pg·g-1dw,平均3.50 pg·g-1dw,最高含量在海拔3927 m的塘房.co-PCBs的总含量平均为9.14 pg·g-1dw,最高值在海拔4487 m的垭口.总2,3,7,8-PC-DD/Fs和总co-PCBs含量随海拔高度的变化表现出正相关关系.不同海拔高度土壤中的PCDD/Fs和co-PCBs异构体的分布相似,表明具有相同的来源.总PCNs与海拔梯度呈负相关关系,最高含量出现在海拔3345 m的贝母坪,平均21.4 pg·g-1dw,主要以3-氯为主.土壤中PCDD/Fs毒性当量浓度范围为0.29—0.43pg TEQ·g-1dw.牦牛肉和牦牛组织中PCDD/Fs总浓度分别为27.5和23.6 pg.g-1脂肪,毒性当量浓度为4.04和4.07 pg TEQ·g-1脂肪.结果表明,牦牛中的PCDD/Fs,co-PCBs和PCNs不大可能对卧龙地区人群导致严重的负面效应.
Five of top soils and two yak samples were collected from Wolong area and analyzed to determine the concentration levels, altitude distribution, sources, and toxicity equivalency quantity （TEQ） of polychlorinated dibenzo-p-dioxins and dibenzofurans （ PCDD/Fs ）, co-planar polychlorinated biphenyls （ co-PCBs ） and polychlorinated naphthalenes （PCNs） . The total PCDD/Fs concentrations in the top soils ranged between 2.48----4. 30 pg·g^-1 dw, averaging 3.50 pg·g^-1 dw with the highest concentration at 3927 m altitude. The total co-PCBs concentrations averaging 9. 14 pg·g^-1 dw with the highest concentration at 4487 m altitude. The total 2,3,7,8-PCDD/Fs and total co-PCBs concentrations showed positive co-relationships with altitude. The congener profiles of both 2,3,7,8-PCDD/Fs and co-PCBs at different altitudes showed similar patterns, suggesting similar sources. The total PCNs, averaging 21.4 pg·g^-1 dw showed a negative co-relationship with altitude, with the highest concentration at 3345 m altitude. The total PCNs is dominated by tri-CNs. The atmospheric transportation is likely the sources for them. The PCDD/Fs-TEQ in the soils were in the range of 0. 29---0. 43 pg·g^-1 dw. The total concentrations of PCDD/Fs in the yak meat and tissue were 27.5 and 23.6 pg·g^-1 lipid, respectively, while the PCDD/Fs-TEQ in the yak meat and tissue were 4. 04 and 4. 07 pg TEQ ·g^-1 lipid respectively, which is unlikely to cause adverse health effect to the yak-meat consuming people.
出处
《环境化学》
CAS
CSCD
北大核心
2009年第2期276-283,共8页
Environmental Chemistry
基金
国家重点基础研究发展计划973项目(2003CB415003)
国家自然科学基金面上项目(40773010)
