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首页> 外文期刊>Environmental Science & Technology >Effect of Radial Directional Dependences and Rainwater Influence on CVOC Concentrations in Tree Core and Birch Sap Samples Taken for Phytoscreening Using HS-SPME-GC/MS
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Effect of Radial Directional Dependences and Rainwater Influence on CVOC Concentrations in Tree Core and Birch Sap Samples Taken for Phytoscreening Using HS-SPME-GC/MS

机译：径向方向依赖性和雨水对树芯和桦树汁样品HS-SPME-GC / MS提取植物CVOC浓度的影响

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摘要

Phytoscreening for chlorinated volatile organic compounds (CVOC) in tree core samples is influenced by many factors. For instance, greater fluctuations are observed for CVOC concentrations in samples taken around the trunk at a fixed height compared to samples taken directly next to each other. To avoid false negatives and inaccurate interpretation of the results, we investigated this radial directional dependence as well as the influence of rainwater on measured concentrations. CVOC analysis was performed by gas chromatography/mass spectrometry (GC/MS) following Solid-Phase-Microextraction (SPME). Phytoscreening was successfully carried out at three sites using this method. In addition, sap samples were taken from white birches during their budding period as a novel phytoscreening approach. Birch sap sampling is shown to be a suitable means of characterizing contaminant distribution within the soil subsurface. Radial directional dependence of CVOC concentrations varies by almost 80% for tree core samples and 50% for birch sap samples. Variations in concentrations measured around the trunk do not, however, provide information on the inflow direction of contaminated groundwater. The weather conditions were shown to have a greater influence so that CVOC concentrations measured from samples taken during colder, rainier weather were, on average, a factor of 100 lower than those taken during a warm and dry period. Nevertheless phytoscreening is adequate for CVOC characterization in the soil subsurface if the campaign is carried out during a dry weather period, the results then can be taken as being semiquantitative.
机译：对树芯样品中的氯代挥发性有机化合物（CVOC）进行植物筛选的因素很多。例如，与直接相邻采集的样品相比，在树干周围以固定高度采集的样品中CVOC浓度的波动更大。为避免假阴性和结果解释不正确，我们研究了这种径向方向依赖性以及雨水对测量浓度的影响。固相微萃取（SPME）后，通过气相色谱/质谱（GC / MS）进行CVOC分析。使用这种方法成功地在三个地点进行了植物筛选。此外，作为一种新型的植物筛选方法，在白桦萌芽期从树液中提取汁液样品。桦树汁采样被证明是表征土壤表层下污染物分布的合适方法。对于树芯样品，CVOC浓度的径向方向依赖性几乎变化了80％，对桦树汁样品的变化为50％。但是，在树干周围测得的浓度变化并不能提供有关被污染的地下水流入方向的信息。事实表明，天气条件的影响更大，因此，从较冷，多雨的天气中采集的样品测得的CVOC浓度平均比在温暖干燥的季节采集的CVOC浓度低100倍。然而，如果在干旱的天气条件下进行植物筛选，则足以对土壤表层下的CVOC进行表征，那么该结果就可以视为半定量的。

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  • 来源
    《Environmental Science & Technology》 |2011年第22期|p.9604-9610|共7页
  • 作者

    Olaf Holm; Wolfgang Retard;

  • 作者单位

    Department of Environmental Engineering, Technische Universitat Berlin, Germany, Strasse des 17. Juni 13S, D-10623 Berlin,Germany;

    Department of Environmental Engineering, Technische Universitat Berlin, Germany, Strasse des 17. Juni 13S, D-10623 Berlin,Germany;

  • 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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