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Fingerprinting Localized Dioxin Contamination: Ichihara Anchorage Case

机译：指纹局部二恶英污染：市原锚地案

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摘要

Although concentrations of polychlorinated dibenzo-p-dioxins and dibezofurans (PCDD/Fs; dioxins) in majority of Japanese river and ocean sediments decreased below the national environmental quality standard of 150 pg-TEQ· (g-dry sediment)~(-1) by 2004, localized contamination inasmuch as 100-fold excess of the environmental quality standard has been reported at various locations including Ichihara Anchorage in northeastern Tokyo Bay. In the present study, we analyzed all mono- to octachlorinated dioxins in 12 surface sediments from Ichihara Anchorage and applied positive matrix factorization (PMF) to quantitatively fingerprintthe congener pattern and geographical distribution of a factor causing the localized contamination. A PMF-derived fingerprint attributable to dioxin impurities in pentachlorophenol (PCP) exerted more than 90% contribution to total dioxin concentrations in Ichihara Anchorage surface sediments. Although majority of Ichihara Anchorage-born dioxins were trapped at the origin, contribution of the PCP-derived dioxins in overall Tokyo Bay gradually increased toward Ichihara Anchorage, indicating the impact of localized dioxin contamination on a large proportion of Tokyo Bay. We suggest that, in addition to runoff from rice paddies (to which PCP had long been applied as herbicide) at the basin, Ichihara Anchorage serves as a significant source of PCP-derived dioxins especially in eastern Tokyo Bay.
机译：尽管日本大部分河流和海洋沉积物中的多氯二苯并对二恶英和双唑呋喃（PCDD / Fs;二恶英）的浓度降低到低于国家环境质量标准150 pg-TEQ·（g-干沉降）〜（-1）到2004年，据报道，包括东京湾东北部的Ichihara Anchorage在内的许多地方，局部污染程度都超过了环境质量标准的100倍。在本研究中，我们分析了来自Ichihara Anchorage的12个表面沉积物中的所有一氯到八氯二恶英，并应用正矩阵分解（PMF）定量指纹图谱，分析了引起局部污染的因素的同类和地理分布。源自五氯苯酚（PCP）中二恶英杂质的PMF指纹对市原锚地表层沉积物中二恶英总浓度的贡献超过90％。尽管大多数由市原安克雷奇市出生的二恶英被捕获，但五氯苯酚衍生的二恶英在整个东京湾中的贡献逐渐向市原安克雷奇增加，这表明局部二恶英污染对东京湾的大部分地区都有影响。我们建议，除了流域的稻田（长期以来一直将PCP用作除草剂）的稻田径流外，Ichihara Anchorage还是PCP衍生的二恶英的重要来源，尤其是在东京湾东部。

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  • 来源
    《Environmental Science & Technology》 |2007年第11期|p.3864-3870|共7页
  • 作者

    MINORI UCHIMIYA; MARI ARAI; SHIGEKI MASUNAGA;

  • 作者单位

    Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya, Yokohama 240-8501, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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