Free-range chicken eggs as a bioindicator of dioxin contamination in Vietnam,including long-term Agent Orange impact  

作　　者：Anastasia D.Kudryavtseva Andrey A.Shelepchikov Efim S.Brodsky 

机构地区：[1]Institute of Ecology and Evolution RAS,Leninsky Prosp.,33,Moscow,119071,Russia

出　　处：《Emerging Contaminants》2020年第1期114-123,共10页新兴污染物（英文）

摘　　要：PCDD/Fs contamination of free-range chicken eggs and soils from private Vietnam households was studied.The possibility of using free-range eggs as bio-indicators of dioxin contamination was considered as the soil-chicken-egg exposure pathway is considered to be the most sensitive exposure pathway of dioxins in soils to humans.A large territory from Dong Nai province in the south to Lao Cai province in the north was covered by the research.All analyses were performed by HRGC-HRMS method.PCDD/Fs levels in eggs from the majority of southern households exceeded the EC limit for eggs and egg products(2.5 pg WHO-TEQ2005 g^-1 lipid).Total TEQs ranged from 0.4 to 361 pg WHO-TEQ2005 g^-1 lipid in eggs and from 0.1 to 1272 pg WHO-TEQ2005/g in soil.2,3,7,8-TCDD contribution was statistically significantly higher in both eggs and soils in sprayed with Agent Orange areas,indicating its long-term impact.In order to assess within site variation,a total of 62 individual eggs from 14 private households were analyzed.Mean relative standard deviation of total TEQ values in individual eggs within the separate households was 27%.Rather good correlation of PCDD/Fs concentration in eggs and respective soils was observed for all dioxin congeners and for hexa-and hepta-furans(except for 1,2,3,7,8,9-HxCDF).Higher bioaccumulation for lower chlorinated congeners was confirmed.The current study of using eggs as bioindicators for large POPs contaminated sites may be suggested as a policy approach to evaluate human exposure to dioxin/POPs contaminated sites for known or suspected contaminated areas.

关 键 词：PCDD/FS Free-range chicken eggs Dioxin contamination VIETNAM Agent Orange Bioaccumulation 

分 类 号：X592[环境科学与工程—环境工程]