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Analysis of Perfluoroalkyl Carboxylic Acids in Composite Dietary Samples by Gas Chromatography/Mass Spectrometry with Electron Capture Negative lonization

机译:气相色谱/质谱-电子捕获负电离分析复合膳食样品中的全氟烷基羧酸

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摘要

A gas chromatography-mass spectrometry and electron-capture negative ionization (ECNI) method was developed to quantify perfluorinated carboxylic acids (PFCAs) in composite dietary samples. Benzyl esterification was used for pretreatment before PFCAs analysis. This stabilized the benzyl radical leaving group preferentially, and gave carboxylic anions of the PFCAs with ECNI. The method had a low detection limit (0.3-10 pg g~(-1)) and good recoveries (98-90%) for PFCAs with 8-14 carbon atoms (C8 to C14). The method was applied to 24-h dietary samples from subjects in Japan (Hokkaido, Kyoto, and Okinawa; 1992 to 2007, and 2009), Korea (Seoul; 1994 and 2007), and China (Beijing; 1993 and 2009). The levels of the PFCAs were between 39 and 169 ng day~(-1) in Korea, 58 and 71 ng day~(-1) in China, and 56 and 67 ng day~(-1) in Japan. Between the two sampling years, the total levels of PFCAs (C8 to C14) increased significantly (ρ < 0.05). The interaction between the sampling location in Korea and year was significant (ρ < 0.05).
机译:建立了气相色谱-质谱和电子捕获负电离(ECNI)方法来定量复合饮食样品中的全氟羧酸(PFCA)。在进行PFCA分析之前,将苄基酯化用于预处理。这优先稳定了苄基离去基团,并给出了带有ECNI的PFCA的羧基阴离子。该方法具有较低的检出限(0.3-10 pg g〜(-1)),并且对于具有8-14个碳原子(C8至C14)的PFCA具有良好的回收率(98-90%)。该方法应用于来自日本(北海道,京都和冲绳; 1992年至2007年和2009年),韩国(首尔; 1994年和2007年)以及中国(北京; 1993年和2009年)的受试者的24小时饮食样本。 PFCA的水平在韩国为39至169 ng day〜(-1),在中国为58至71 ng day〜(-1),在日本为56至67 ng day〜(-1)。在两个采样年之间,PFCA的总水平(C8至C14)显着增加(ρ<0.05)。韩国的采样地点与年份之间的交互作用很显着(ρ<0.05)。

著录项

  • 来源
    《Environmental Science & Technology》 |2012年第20期|p.11235-11242|共8页
  • 作者单位

    Department of Health and Environmental Sciences, Kyoto University Graduate School of Medicine, Yoshida, Kyoto 606-8501, Japan;

    Department of Health and Environmental Sciences, Kyoto University Graduate School of Medicine, Yoshida, Kyoto 606-8501, Japan;

    Department of Health and Environmental Sciences, Kyoto University Graduate School of Medicine, Yoshida, Kyoto 606-8501, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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