Citation: REN Daiwei, LIANG Tao, LI Gang, ZHANG Haidong, WANG Pu, XIAO Ke, LI Yingming, ZHANG Qinghua. Identification of two interference peaks during dioxin analysis for biological samples[J]. Chinese Journal of Chromatography, ;2014, 32(9): 971-974. doi: 10.3724/SP.J.1123.2014.05031 shu

Identification of two interference peaks during dioxin analysis for biological samples

REN Daiwei ¹ ,
LIANG Tao ² ,
LI Gang ¹ ,
ZHANG Haidong ¹ ,
WANG Pu ¹ ,
XIAO Ke ¹ ,
LI Yingming ¹ ,
ZHANG Qinghua ^1,,

1.
1. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

Corresponding author: ZHANG Qinghua,
Received Date: 22 May 2014
Available Online: 16 July 2014
Fund Project: 国家自然科学基金项目(41276195,21277165,21107121). (41276195,21277165,21107121)

Two interference peaks which generally appeared in company with ¹³C labeled 2,3,7,8-tetrachlorodibenzofuran (¹³C₁₂-2,3,7,8-TCDF) in the same ion channel during dioxin analysis for biological samples were identified using high resolution gas chromatography/high resolution mass spectrometry (HRGC/HRMS) and high resolution gas chromatography/low resolution mass spectrometry (HRGC/LRMS). It was firstly inferred that the interference peaks should be the two isomers of dichlorodiphenyldichloroethylene (DDE), which was a breakdown product of dichlorodiphenyltrichloroethane (DDT), one of the typical organic chlorine pesticides (OCPs). Thereafter, the standard solution of DDE including o,p'-DDE and p,p'-DDE was analyzed for confirmation. By evaluation of the peak separation in HRGC/HRMS, comparison of the GC retention times and ion abundance ratios of the two interference peaks in real samples with the two DDE isomers in standard solution, the interference peaks were finally confirmed as o,p'-DDE and p,p'-DDE in sequence on a DB-5MS column. This study provided valuable information for accurate identification of dioxin compounds during the biological sample analysis.
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